unique_id stringlengths 2 7 | problem stringlengths 9 11.6k | answer stringlengths 0 2.49k | answer_type stringclasses 11
values | category stringclasses 16
values | difficulty stringclasses 5
values |
|---|---|---|---|---|---|
1632984 | Which item reduces the DNA content (in the daughter cells compared to the parent cell)?
A. Meiosis 1
B. Meiosis 2
C. Mitosis
D. More than one of the above.
E. All of the above (A+B+C).
F. None of the above. | A | Multiple Choice | Biology | Senior High School |
496754 | Evaluate {eq}\int x^3(1 - x^2)^\frac{1}{2} dx. | \frac{(1 - x^2)^\frac{3}{2}(2 + 3x^2)}{15} + c | Expression | Mathematics | University |
1788301 | A tank contains 360 liters of fluid in which 50 grams of salt is dissolved. Brine containing 1 gram of salt per liter is then pumped into the tank at a rate of 6 L/min; the well-mixed solution is pumped out at the same rate. Find the number A(t) of grams of salt in the tank at time t. | A(t) = 360 - 310e^{-t/60} | Expression | Mathematics | University |
956988 | I want to solve $$(x^2-y)dx+xdy=0$$ Since in this form it is not an exact dif eq I multiply by a $\mu(x,y)$ factor so that it reduces to one. $$\mu (x^2-y)dx+\mu xdy=0$$ With the conditions $P_y' = Q_y'$ and $$P=\mu (x^2-y)$$ $$Q=\mu x$$ $$\mu _y'(x^2-y)-\mu=x\mu_x'+\mu$$ From here I don't know how to find $\mu$ since ... | \mu(x) = \frac{1}{x^2} | Expression | Mathematics | University |
908226 | A ladder having a uniform density and a mass m rests against a frictionless vertical wall, making angle 50.5 degrees with the horizontal. The lower end rests on a flat surface where the coefficient of static friction is {eq}\mu
{/eq}s = 0.400. A window cleaner with mass M = 2m attempts to climb the ladder. Given a lad... | 0.48 | Float | Physics | University |
707535 | What is the intensity of an electromagnetic wave with a peak electric field strength of 170 V/m? W/m{eq}^2
{/eq} | 38.36 W/m^2 | Float | Physics | Senior High School |
595553 | A positive point charge {eq}Q_1 = 4.6 \times 10^{-5}
{/eq} C is fixed at the origin of coordinates, and a negative point charge {eq}Q_2 = -6.5 \times 10^{-6}
{/eq} C is fixed to the x-axis at x = +2.5 m. Find the location of the place(s) along the x-axis where the electric field due to these two charges is zero. | 1.817 m | Float | Physics | University |
751162 | The controller for Nesheim Construction Company believes that it is appropriate to offset a note payable to Oregon Bank against an account receivable from Oregon Bank related to remodeling services provided to the bank. What is the authoritative guidance concerning the criteria to be met to allow such offsetting? | The criteria to be met for offsetting a note payable with an account receivable are that the amounts can be reliably determined, the reporting party intends to set off, right of set off must be with party whose payment is earlier if due dates differ, and enforceability should be there according to law. | List | Business | University |
683568 | Perform the following calculation and give your answer with the correct number of significant figures.
1.872 g + 2.35 g + 0.07983 g = _____ | 4.30 g | Float | Chemistry | Senior High School |
711750 | If I have two spheres, one of which is centred on the origin with a radius of $2$, and the other which is centred at $(0,0,2)$ with a radius of 2, how would I go about setting up the integral that represents the volume of the intersection of the two spheres, and then show that this volume is less than $6\pi$? | \frac{10\pi}{3} | Fraction | Mathematics | University |
247538 | Given the tetrad basis $\{(e_{\mu})\}$, where $(e_{\mu})^a (e_{\nu})_a = \eta_{\mu \nu}$, and the Riemann tensor components $R_{\rho \sigma \mu \nu} = R_{abcd} (e_{\rho})^a (e_{\sigma})^b (e_{\mu})^c (e_{\nu})^d$, how do I derive the Ricci tensor components $R_{\rho \mu} = \eta^{\sigma \nu} R_{\rho \sigma \mu \nu}$ in ... | $$R_{\rho \mu} = \eta^{\sigma \nu} R_{\rho \sigma \mu \nu}$$ | Expression | Mathematics | University |
1470076 | Convert the microscopic measurement of 0.01 micrometers to nanometers. | 10 nm | Integer | Physics | Junior High School |
405600 | A 20.0 kg block is connected to a 30.0 kg block by a string that passes over a light friction less pulley. The 20.0 kg block rests on a friction less plane that is inclined at an angle of 40.0{eq}^\circ
{/eq} with the horizontal and the 30.0 kg block is hanging vertically from the pulley. The other end of the 30.0 kg ... | 1.24 m/s | Float | Physics | University |
1897236 | Set up the iterated double integral to find the volume bound by the cone {eq}f(x, y) = 1 - \sqrt {x^2 + y^2} {/eq} | {eq}\int_0^{2\pi} \int_0^1 (1-r) r dr d\theta{/eq} | Expression | Mathematics | University |
262429 | Find the area of the region that lies inside both curves.
{eq}r = 2 + \cos \theta, \; r = 2 - \cos \theta
{/eq} | \frac{9\pi}{2}-8 | Expression | Mathematics | University |
827531 | Cleveland Millicrum is considering when to harvest its moldy bread supply for antibiotics. It has calculated that the current NPV dollars for harvesting the bread are increasing according to the following schedule. When should the firm harvest the bread? The cost of capital for the firm is 14%. Please show steps and so... | Year 3 | Integer | Finance | University |
1515816 | What is the transfer function of the amplitude modulation element where the output is simply the input multiplied by a sinusoidal wave with a constant amplitude? | G(s) = \frac{\omega s}{s^2 + \omega^2} | Expression | Other STEM | University |
1296274 | Find the exact area of the surface obtained by rotating the curve about the x-axis: {eq}y = \frac{x^3}{2} + \frac{1}{6x}, \frac{1}{2} \leq x \leq 1{/eq}. | \frac{445\pi}{768} | Fraction | Mathematics | University |
1581580 | Data concerning Wislocki Corporation's single product appear below:
Per UnitPercent of Sales
Selling price$140100%
Variable expenses2820%
Contribution margin$11280%
Fixed expenses are $1,055,000 per month. The company is currently selling 9,700 units per month.
Required:
The marketing manager would like to introd... | $34,600 | Integer | Business | University |
385673 | A piece of newly purchased industrial equipment costs $979,000 and is classified as seven-year property under MACRS. The MACRS depreciation schedule is shown in Table 10.7. Calculate the annual depreciation allowances and end-of-the-year book values for this equipment. (Leave no cells blank - be certain to enter "0" wh... | Year 1: Depreciation = $139,899, Ending Book Value = $839,101
Year 2: Depreciation = $239,757, Ending Book Value = $599,344
Year 3: Depreciation = $171,227, Ending Book Value = $428,117
Year 4: Depreciation = $122,277, Ending Book Value = $305,840
Year 5: Depreciation = $87,425, Ending Book Value = $218,415
Year 6: Dep... | List | Finance | University |
556952 | What is true about party politics?
O A. People care more about the candidates than about the party's
politics.
B. People frequently change political parties depending on who the
candidates are.
C. People tend to support a specific political party no matter who the
candidates are.
D. All of the above are correct. | C | Multiple Choice | Other | Senior High School |
1386056 | Use integration by parts to evaluate the integral.
{eq}\int_{1}^{4} x^2 \ln(6x) \, \mathrm{d}x
{/eq} | \frac{64\ln(24) - \ln 6}{3} - 7 | Expression | Mathematics | University |
338441 | Let {eq}T1,T2{/eq}, and {eq}S{/eq} be exponential random variables with parameter {eq}\lambda{/eq} for {eq}T1{/eq} and {eq}T2{/eq} and {eq}\mu{/eq} for {eq}S{/eq}. We assume that {eq}T1,T2{/eq}, and {eq}S{/eq} are independent. Derive an expression for the expected value of {eq}min(T1 + T2, S){/eq} in terms of {eq}\lamb... | (μ+2λ)/(μ+λ)^2 | Expression | Mathematics | University |
1320494 | Write a string constant consisting of exactly 5 exclamation marks. | const string str = "!!!!!"; | String | Computer Science | Primary School |
1091664 | Evaluate the triple integral {eq}\displaystyle \iiint_T xy \sin z \, dV{/eq} where {eq}T{/eq} is the cube given by {eq}T= [ 0, \frac{\pi}{2} ] \times [0, \frac{\pi}{2} ] \times [0, \frac{\pi}{2} ]{/eq}. | 1.52201 | Float | Mathematics | University |
922172 | How does the retail inventory method establish the lower-of-cost-or-market valuation for ending inventory?
a. By excluding beginning inventory from the cost-to-retail ratio.
b. By excluding net markups from the cost-to-retail ratio.
c. By excluding net markdowns from the cost-to-retail ratio.
d. The procedure is ap... | b | Multiple Choice | Business | University |
813830 | How can I express the helix parametrized by $x(\lambda)=\cos \lambda, \quad y(\lambda)=\sin \lambda, \quad z(\lambda)=\lambda$ in spherical coordinates $(r,\theta,\phi)$? | The helix can be expressed in spherical coordinates with the following two equations:
$\\r^2\sin^2\theta=1$\\
$\\\phi=r\cos\theta$ or $\\rho\sin\phi=1$ and $\\rho^2=1+\theta^2$ | Expression | Mathematics | University |
304314 | How do you integrate #int dx/sqrt(x^2+4)# using trig substitutions? | #sinh^{-1}(x/2)+C# | Expression | Mathematics | University |
1614305 | You are evaluating a product for your company. You estimate the sales price of the product to be $150 per unit and sales volume to be 10,500 units in year 1; 25,500 units in year 2; and 5,500 units in year 3.
The project has a 3-year life. Variable costs amount to $75 per unit and fixed costs are $205,000 per year. Th... | b | Multiple Choice | Finance | University |
918999 | Find the Taylor series for {eq}\displaystyle
f(x) = \frac{1}{(x - 1)^3} \text{ at c = 2 }
{/eq} from scratch (not using an established series). | T(x) =1-3(x-2)+6(x-2)^2 -10(x-2)^3 +15 (x-2)^4 +... | Expression | Mathematics | University |
604786 | Sanders Enterprises, Inc., has been considering the purchase of a new manufacturing facility for $278,000. The facility is to be fully depreciated on a straight-line basis over seven years. It is expected to have no resale value after the seven years. Operating revenues from the facility are expected to be $113,000, in... | 18334.71 | Float | Finance | University |
1039876 | Humes Corporation makes a range of products. The company's predetermined overhead rate is $22 per direct labor-hour, which was calculated using the following budgeted data:
Variable manufacturing overhead$68,000
Fixed manufacturing overhead$306,000
Direct labor-hours17,000
Management is considering a special order fo... | 7040 | Integer | Business | University |
760513 | Consider a piston-cylinder device that contains nitrogen gas as the system. Initially, the system is at 1.0 MPa and 427{eq}^\circ
{/eq}C. It now undergoes a constant pressure process until its temperature is 27{eq}^\circ
{/eq}C.
Determine the heat transfer, in kJ/kg, associated with this process. | -415.6 KJ/kg | Float | Physics | University |
442184 | An aqueous solution containing 1.00 g of bovine insulin (a protein, not ionized) per liter has an osmotic pressure of 3.1 mm Hg at 25 °C. How do you calculate the molar mass of bovine insulin? | 6.0 × 10^3 g/mol | Float | Chemistry | Senior High School |
1421650 | What is the correct sequence of stages in cellular respiration? | Glycolysis -> Krebs cycle -> Electron transport chain | List | Biology | Senior High School |
370966 | The income statement, balance sheets, and additional information for Video Phones, Inc., are provided.
VIDEO PHONES, INC.
Income Statement
For the Year Ended December 31, 2018
Net sales $2,886,000
Expenses:
Cost of goods sold$1,800,000
Operating expenses828,000
Depreciation expense24,000
Loss on sale of la... | Cash Flow from Operating Activities
Net Income: $167,800
Depreciation: $24,000
Loss on Sale of Land: $7,700
Decrease in Inventory: $27,000
Increase in Accounts Receivable: -$20,700
Increase in Prepaid Expenses: -$5,040
Decrease in Accounts Payable: -$14,700
Decrease in Interest Payable: -$3,700
Increase in Income Tax P... | List | Business | University |
1654666 | Solve the integral using the appropriate trig. sub: {eq}\int \frac{dx}{(x^2+25)^3} {/eq}. | \frac{{3x}}{{5000({x^2} + 25)}} + \frac{x}{{100{{({x^2} + 25)}^2}}} + \frac{{3\arctan \left( {\frac{x}{5}} \right)}}{{25000}} + C | Expression | Mathematics | University |
986381 | How should I proceed to prove the differentiability of $h:\Bbb R^n\to\Bbb R, h(x)=\langle f(x),g(x)\rangle,$ where $f,g:\Bbb R^n\to\Bbb R^m$ are differentiable functions, given that I have shown $\frac{\partial h}{\partial v}(c)=\left\langle\frac{\partial f}{\partial v}(c),g(c)\right\rangle+\left\langle f(c),\frac{\par... | \nabla \langle f(p),g(p)\rangle =J^T_f(p)g(p)+J^T_g(p)f(p) | Expression | Mathematics | University |
1266817 | What is the other term used for epistemological holism? | Confirmation holism | String | Philosophy | University |
1216828 | Do private equity firms pay a finder's fee? | Yes | Boolean | Business | Senior High School |
1532629 | Benton Corporation produces two grades of wine from grapes that it buys from California growers. It produces and sells roughly 3,000,000 liters per year of a low-cost, high- volume product called CoolDay. It sells this in 600,000 5-liter jugs. Benton also produces and sells roughly 300,000 liters per year of a low-volu... | CoolDay:
Grape processing: $133,440
Aging: $303,000
Bottling and corking: $192,600
Labeling and boxing: $133,800
Maintain & inspect equipment: $106,750
Total overhead costs: $869,590
Overhead cost per liter: $1.45
LiteMist:
Grape processing: $13,344
Aging: $363,600
Bottling and corking: $96,300
Labeling and boxing: $6... | List | Business | University |
1433438 | Overland Corporation has gathered the following data on a proposed investment project:
Investment required in equipment $150,000
Annual Cash inflows$40,000
Salvage value of equipment $0
Life of the investment 10 year
Required rate of return10%
The company uses straight-line depreciation on all equipment. Assume cash ... | A. 23% | Percentage | Business | University |
1254040 | Which part of the body is responsible for controlling sleep, appetite, and temperature? | hypothalamus | String | Biology | Junior High School |
2106886 | Does the Marshall Space Flight Center do their own manufacturing? | Yes | Boolean | Other STEM | Junior High School |
1795370 | Assume water boils at 100.0 {eq}^{\circ}
{/eq}C in Houston (near sea level), and at 90.0 {eq}^{\circ}
{/eq}C in Cripple Creel Colorado (near 9,500 ft). If it takes 4.5 min to cook an egg in Cripple Creek and 4.2 min in Houston, what is {eq}E_a
{/eq} for this process? Answer in scientific notation. | 7.8E+3 J/mol | Float | Chemistry | University |
1965208 | Choose the positive direction to be from the pitcher to the plate (some answers may be negative).
A pitcher throws a 0.17 kg baseball so that it crosses home plate horizontally with a speed of 14 m/s. It is hit straight back at the pitcher with a final speed of 19 m/s.
Find the average force exerted by the bat on the... | -6200 N | Integer | Physics | Senior High School |
1192461 | The formula for the amount of distance a car travels over time is {eq}d = r t
{/eq} (where {eq}d
{/eq} represents distance, {eq}r
{/eq} represents the rate of speed and {eq}t
{/eq} represents time). Find the exponent if the rate is written as a function of time. | -1 | Integer | Physics | Senior High School |
101533 | Is it true that after fertilization the young embryo takes about 3 days to travel down the fallopian tube to the uterus? | Yes | Boolean | Biology | Senior High School |
435842 | The elements of a determinant are arbitrary integers. Determine the probability that the value of the determinant is odd. | $\prod_{i=1}^n \left(1-\frac1{2^i}\right)$ | Expression | Mathematics | University |
658647 | Determine whether the following statement is a disadvantage of a transnational strategy: Single locations may lead to higher tariffs and transportation costs. | No | Boolean | Business | Senior High School |
739227 | If $A$ is a $k\times k$ matrix and if $\{v_{1},v_{2},\cdots,v_{k}\}$ is a linearly independent set of $k$ vectors in $\mathbb{R}^{n}$, then the rows of the product $A\begin{bmatrix}v_{1}\\ v_{2}\\ \vdots\\ v_{k} \end{bmatrix}$ are linearly independent if and only if $A$ is invertible. Is this true or false? | True | Boolean | Mathematics | University |
1083288 | Why is the formula for the $y$-coordinate of a centroid, with upper function $f(x)$ and lower function $g(x)$, given by $\bar y = \frac12 \int (f(x)^2 - g(x)^2) dx$ instead of $\bar y = \frac12 \int (f(x)-g(x))^2 dx$? | $\bar y=\frac{\frac12\int(f^2-g^2)dx}{\int (f-g) dx}$ | Expression | Mathematics | University |
815343 | A new hydraulic lift will cost $137463. At the end of its 6 years of useful life, the machine can be sold for $31681. The new machine will reduce annual expenses by $12280. The interest rate is 7% compounded annually. What is the present worth for this investment?
Round your answer. Do not use a dollar sign ("S") any... | -57820 | Integer | Finance | University |
240830 | What is the maximum distance with maximum data rate for 802.11g? Options are: answer A About 65-75 feet; answer B About 90-100 feet; answer C About 150 feet; answer D Over 200 feet | B | Multiple Choice | Computer Science | Senior High School |
520959 | Creative Sound Systems sold investments, land, and its own common stock for $32 million, $15.2 million, and $40.4 million, respectively. Creative Sound Systems also purchased treasury stock, equipment, and a patent for $21.2 million, $25.2 million, and $12.2 million, respectively. What amount should the company report ... | $9.80 million | Float | Business | Senior High School |
1394710 | Three 0.57 kg particles form an equilateral triangle with 0.51 m sides. The particles are connected by rods of negligible mass. What is the rotational inertia of this rigid body about an axis that passes through one of the particles and is parallel to the rod connecting the other two? | 0.22 kg⋅m^2 | Float | Physics | Senior High School |
1857430 | A heat flow of 45, 000 J changed the temperature of a certain mass of water from 25 C to 45 C. If the heat flow came from 350 g of lead shot, what must have been the heat flow, Q, for the lead shot? | -45000J | Integer | Physics | Senior High School |
1690010 | Today, many long-term care policies are treated as tax-qualified contracts. Which of the following is not correct regarding tax-qualified long-term care contracts?
A. Tax-qualified long-term care policies must provide benefits that are limited to long-term care services.
B. These policies can be provided under an e... | C | Multiple Choice | Finance | University |
1120924 | I am trying to solve the following recurrence relation: $T(a,b)=T(a-2^{b-1}+1,b) + T(a,b-1)$ where: $$T(a,-1)=0\\T(0,0)=0\\T(a,1)=1\\T(a,0)=1$$ Can someone give me a hint or point me in the right direction? | $T(a, b) \approx C(b)a^{b-1}$ | Expression | Mathematics | University |
248369 | Compute the (pseudo)inverse of
$\left(
\begin{array}{cc}
-3 & -\frac{23}{9} \\
\frac{10}{9} & \frac{41}{9} \\
\end{array}
\right)$. | \frac{9}{877}\left(
\begin{array}{cc}
-41 & -23 \\
10 & 27 \\
\end{array}
\right) | Matrix | Mathematics | University |
398061 | Use implicit differentiation to find {eq}\frac{dy}{dx}{/eq} in terms of {eq}x{/eq} and {eq}y{/eq} for {eq}x^3-3x^2y+2xy^2=12{/eq} | {eq}\frac{dy}{dx} = \frac{6xy - 2y^2 - 3x^2}{x(4y - 3x)}{/eq} | Expression | Mathematics | University |
928202 | Name
{eq}CH_3CH_2CH(C_2H_5)CH_2CH_2CH_3
{/eq} | 3-ethylhexane | String | Chemistry | Senior High School |
70960 | Use to position function {eq}s(t) = -4.9t^2 + vt + s
{/eq} for free-falling objects to estimate the height of a building, a stone is dropped from the top of the building into a pool of water at ground level. How high is the building of the splash is seen 6.8 seconds after the stone is dropped? | 6.8v-226.576 | Expression | Physics | Senior High School |
1532819 | A point source of light is 96.7cm below the surface of a body of water. Find the diameter of the circle at the surface through which light emerges from the water. Water has an index of refraction of 1.33. | 2.2 m | Float | Physics | Senior High School |
920629 | Calculate a 95% large-sample CI for the true average percentage elongation, given a sample of 52 research cotton samples resulted in a sample average percentage elongation of 8.16 and a sample standard deviation of 1.48. | (7.7479, 8.5721) | List | Mathematics | University |
1154754 | How many moles of sodium phosphate would be required to react with 1.0 mol of silver nitrate? | 1/3 moles | Fraction | Chemistry | Senior High School |
422810 | A comparative balance sheet and an income statement for Burgess Company are given below
BurgessCompany Comparative Balance Sheet (dollars in millions)
Ending Balance Beginning Balance
Assets
Current assets:
Cash and cash equivalents 49 79
Accounts receivable 645 580
Inventory 660 615
Total current assets1,35... | Burgess Company
Statement of Cash Flow
For the fiscal year ending XX
Cash flows from operating activities
Profit 115
Adjustments for:
Depreciation Expense 124
Working capital changes:
(Increase) / Decrease in trade and other receivables -65
(Increase) / Decrease in inventories -45
Increase / (Decrease) in Accounts Pay... | List | Business | University |
1508639 | While polishing a 1-kg brass statue, you do 760 J of work against sliding friction. Assuming that all of the resulting heat flows into the statue, how much does its temperature rise? | 1.95 K | Float | Physics | Senior High School |
95317 | Convert the following matrix to reduced row echelon form:
$\left(
\begin{array}{cccc}
9 & -4 & 10 & 1 \\
-3 & 10 & 4 & 7 \\
-7 & 1 & 1 & 6 \\
\end{array}
\right)$. | \left( \begin{array}{cccc} 1 & 0 & 0 & -\frac{74}{103} \\ 0 & 1 & 0 & \frac{33}{206} \\ 0 & 0 & 1 & \frac{167}{206} \\ \end{array} \right) | Matrix | Mathematics | University |
705713 | Write a program that prompts the user to enter the weight of a person in kilograms and outputs the equivalent weight in pounds. Output both the weights rounded to two decimal places. (Note that 1 kilogram is 2.2 pounds.) | ```python
#Read input from user and save to a variable.
print ("Enter weight in kilograms")
kg_weight = input()
#Convert str input to float and then to pounds.
pd_weight = float(kg_weight) * 2.2
#Format variables to display 2 decimal digits.
print ("Weight in kilograms is %0.2f" % float(kg_weight))
print ("Weight in po... | Float | Computer Science | Primary School |
1817110 | Find the volume of the solid obtained by rotating the region bounded by the curves {eq}y=0,y = \cos(7x) , x = \frac{\pi}{14}, x=0{/eq} about the axis {eq}y = -4{/eq} | 15.222 | Float | Mathematics | University |
10911 | Suppose random variables $X_1,X_2,X_3$ are IID and bounded by $[0, R]$. Why is it obvious that $$ P(X_1 < X_3 | X_1 < X_2) = \int_0^R f_{X_1}(x_1 | X_1 < X_2)P(x_1 < X_3) dx_1 $$ ? | $\mathsf P(X_1<X_3| X_1<X_2)=\dfrac{\int_0^R f_{\small X_1}(x)\,\mathsf P(x<X_2)\,\mathsf P(x<X_3)\,\mathrm d x}{\int_0^R f_{\small X_1}(x)\,\mathsf P(x<X_2)\,\mathrm d x}$ | Expression | Mathematics | University |
245299 | I'm trying to calculate the following integral $$\int\frac{2x^5-5}{x^4-5x^2+6}dx$$. I divided polynomes: $(2x^5-5):( x^4-5x^2+6)=2x+\frac{10x^3-12x-5}{x^4-5x^2+6}$. Then I have $$\int2x dx + \int\frac{10x^3-12x-5}{x^4-5x^2+6}dx$$. I used partial fractions on the second integral and I got $$\frac{Ax+B}{x^2-2}+\frac{Cx+D... | A=-8, B=5, C=18, D=-5 | List | Mathematics | University |
893813 | How many grams of helium will occupy 545 ml at 1.00 atm and 293 K? (Answer should be in 3 significant figures) | 9.06e-2 g | Float | Chemistry | Senior High School |
120363 | Your adolescent child has no interest in social life, never receives phone calls from friends, and spends most of his free time alone. Because this behavior is {_____, you wonder whether your child is having psychological problems.
a. dangerous
b. harmful to self or others
c. bizarre
d. rare or unusual in a teenage... | d | Multiple Choice | Psychology | Senior High School |
1652402 | A fountain designed to spray a column of water 12 m into the air has a 4 cm diameter nozzle at ground level. The water pump is 2.6 m below the ground. The pipe to the nozzle has a diameter of 8 cm. Assume laminar non-viscous flow.
What is the necessary absolute pressure the pump must exert? | 2.35e5 Pa | Float | Physics | University |
366151 | When you step on the accelerator to increase the speed of your car, the force that accelerates the car is.
a. the force of your foot on the accelerator,
b. the force of friction of the road on the tires,
c. the force of the engine on the drive shaft,
d. the normal force of the road on the tires.
(explain) | b | Multiple Choice | Physics | Senior High School |
1649394 | Does W.S. Merwin have children? | No | Boolean | Other | Junior High School |
397714 | Convert the following matrix to reduced row echelon form:
$\left(
\begin{array}{ccccc}
5 & -2 & -3 & 5 & -1 \\
-1 & 0 & 1 & 5 & -1 \\
4 & 3 & 2 & -6 & 1 \\
4 & 6 & -9 & 2 & 10 \\
\end{array}
\right)$. | \begin{pmatrix}
1 & 0 & 0 & 0 & -\frac{167}{949} \\
0 & 1 & 0 & 0 & \frac{771}{949} \\
0 & 0 & 1 & 0 & -\frac{636}{949} \\
0 & 0 & 0 & 1 & -\frac{96}{949}
\end{pmatrix} | Matrix | Mathematics | University |
1556356 | If an electron travels 0.250 m from an electron gun to a TV screen in 32.0 ns, what voltage was used to accelerate it? (Note that the voltage you obtain here is lower than actually used in TVs to avoid the necessity of relativistic corrections.) | 173.52 V | Float | Physics | Senior High School |
1861142 | Income generated by a nation's domestic production
(a) is less than its domestic production.
(b) is equal to its domestic production.
(c) is greater than its domestic production.
(d) could be less than, equal to, or greater than its domestic production. | d | Multiple Choice | Economics | University |
1970192 | Refrigerant- 134a flow through a pipe at 800 KPa. 50 {eq}^o{/eq}C. The specific flow work required to move this fluid through a cross-section of the pipe is
a) 22.84 kJ/kg
b) 31.60 kJ/kg
c) 37.21 kJ/kg
d) 40.70 kJ/kg | a | Multiple Choice | Physics | University |
1579895 | Can we find a closed form for $$I(a)=\int_0^\infty e^{-x}\sin^a(x)dx$$ | $I(a) = \frac{a(a-1)}{a^2+1}I(a-2)$ | Expression | Mathematics | University |
1398944 | Income distribution effects of trade refer to:
a. the fact that some factors gain more than other with trade.
b. the fact that some factors gain and others lose with trade.
c. the fact that some countries gain more than other with trade.
d. the fact that some countries gain and others lose with trade. | b | Multiple Choice | Economics | University |
597650 | Use the Definition to find an expression for the area under the graph of {eq}f(x) =x^2+\sqrt{1+2x}, \; 3 \leq x \leq 5{/eq} as a limit. Do not evaluate the limit. {eq}\lim_{n\rightarrow {\infty}} \sum_{i=1}^{n} \; \rule{20mm}{1pt}{/eq} | \displaystyle \lim_{n \to \infty}{\sum_{i = 1}^{n}{\left(\left(3 + \frac{2(i-1)}{n}\right)^2 + \sqrt{1 + 2\frac{3 + 2(i-1)}{n}}\right)\frac{2}{n}}} | Expression | Mathematics | University |
228845 | Suppose that a fair die is rolled 100 times. Let {eq}X_i
{/eq} be the valued obtained on the ith roll. Compute an approximation for
{eq}\mathbb{P}(\prod_{i = 1}^{100}X_i \leq e^{100})
{/eq} | 0.05536 | Float | Mathematics | University |
1772510 | Determine the form of the limit, and then find it: {eq}\displaystyle \lim_{x \to 0} \left ( \frac{\cos x-1+\frac{1}{2}x^2}{x^4} \right ) | 1/24 | Fraction | Mathematics | University |
182439 | Monopolies have _____ substitutes.
a. many
b. few
c. no
d. several but less than 10 | c | Multiple Choice | Economics | Junior High School |
1241936 | A crank {eq}AB {/eq} is rotating with a constant angular velocity of {eq}4\ \rm{rad/s} {/eq} in a clockwise direction. Determine the angular velocity of connecting rod {eq}CD {/eq} where the midpoint of the connecting rod is at point {eq}B {/eq}, {eq}AB = 300 \ \rm{mm} {/eq}, {eq}AC=600 \ \rm{mm} {/eq} and the angle su... | 1.154 rad/s | Float | Physics | University |
270392 | Q1 and Q2 are charged objects of the same sign separated by a distance 29.9 m. If you place another charged object (Q3) a distance 8.0 m from Q2 along a direct line between Q1 and Q2, it experiences no net electric field. So, if the magnitude of Q2 = 9.3{eq}\mu
{/eq}C, what is the magnitude of charge Q1? | 69.69μC | Float | Physics | Senior High School |
406286 | Workers are initially unemployed and must decide how much effort to put into job search. Searching intensively enough to find work with probability {eq}e
{/eq} generates a utility cost {eq}c(e)=( \frac {1}{y} )( \frac {e^{2}}{2})
{/eq}. Workers who find a job receive after-tax consumption utility {eq}ln(W, t)
{/eq}.... | e * ln(W, t) + (1 - e) * ln(b) - (1/y)(e^2/2) | Expression | Economics | University |
1086549 | Sanfro, a Swiss pharmaceutical firm, wishes to market its new cholesterol medication in the Eastern European market. It is considering a distribution agreement with a Czech firm for a period of six years. Marcel Kleiber, Sanfro's CFO, is unsure of the advantages and disadvantages of entering into the distribution agree... | 17.944 | Float | Finance | University |
1122942 | Kabuki Company's policy is to have 17% of the next month's sales as desired ending inventory. Estimated sales are shown in the following table. Given this data, what are Kabuki's estimated purchases for April?
March
April
May
Expected sales units
10,300
9,800
8,000
... | 9494 | Integer | Business | Senior High School |
383563 | What religion was Andrew Jackson? | Presbyterian | String | History | Junior High School |
221790 | Cornell Company is preparing its direct labor budget for 2012 from the following production budget based on a calendar year:
Quarter Units
1 20,000
2 25,000
3 30,000
4 50,000
Each unit requires 2 hours of direct labor. The union contract provides for the wage rate to be $11 per hour for the first 3 quarters and a wag... | Quarter 1: $440,000
Quarter 2: $550,000
Quarter 3: $660,000
Quarter 4: $1,300,000 | List | Business | Senior High School |
1235902 | To keep the benefits from the subsidization in India, the Ministry of New and Renewable Energy issued rules that banned the importation of solar panels. Indicate whether the statement is true or false | True | Boolean | Economics | Senior High School |
847245 | The concentration of {eq}SO_4^{2-} (aq){/eq} in a sample of river water can be determined using a precipitation titration in which a salt of {eq}Ba^{2+} (aq){/eq} is the standard solution and {eq}BaSO_4 (s){/eq} is the precipitate formed. What is the concentration of {eq}SO_4^{2-} (aq){/eq} in a {eq}43.9 mL{/eq} sample... | 1.446e-4 mol/L | Float | Chemistry | Senior High School |
1821802 | Calculate the pH of a buffer that contains 0.270 M {eq}HF
{/eq} and 0.180 M {eq}CsF
{/eq}. The {eq}K_a
{/eq} of {eq}HF
{/eq} is {eq}6.80 \times 10^{-4}
{/eq}. | 2.98 | Float | Chemistry | Senior High School |
1649280 | Do insurers cover riot damage for businesses? | Yes | Boolean | Finance | Junior High School |
326094 | A 400 kg anchor hangs vertically under a boat on a 600 kg cable that is 200 meters long.
Write an integral for how much work is required to lift 50 meters of the cable onto the boat. You do not need to compute the value of the integral. | ∫_{0}^{50} (400 + (600 - 3x)) * g * x dx | Expression | Physics | University |
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