question: Which of the following conditions will ensure that angular momentum is conserved? I. Conservation of linear momentum II. Zero net external force III. Zero net external torque

options:
- I and II only
- I and III only
- II and III only
- III only


question: A pipe full of air is closed at one end. A standing wave is produced in the pipe, causing the pipe to sound a note. Which of the following is a correct statement about the wave’s properties at the closed end of the pipe?

options:
- The pressure is at a node, but the particle displacement is at an antinode.
- The pressure is at an antinode, but the particle displacement is at a node.
- The pressure and the particle displacement are both at nodes.
- The pressure and the particle displacement are both at antinodes.


question: A photocell of work function ϕ = 2eV is connected to a resistor in series. Light of frequency f = 1 × 10^15 Hz hits a metal plate of the photocell. If the power of the light is P = 100 W, what is the current through the resistor?

options:
- 2:00 AM
- 6:00 AM
- 12:00 AM
- 24 A


question: A microwave oven is connected to an outlet, 120 V, and draws a current of 2 amps. At what rate is energy being used by the microwave oven?

options:
- 10 W
- 30 W
- 60 W
- 240 W


question: A point charge, Q = +1 mC, is fixed at the origin. How much work is required to move a charge, Q = +8 µC, from the point (0, 4 meters) to the point (3 meters, 0)?

options:
- 3.5 J
- 6.0 J
- 22.5 J
- 40 J