1.3 KiB
1.3 KiB
| 1 | 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 | I and II only | I and III only | II and III only | III only | D |
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| 2 | 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? | 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. | B |
| 3 | 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? | 2:00 AM | 6:00 AM | 12:00 AM | 24 A | D |
| 4 | 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? | 10 W | 30 W | 60 W | 240 W | D |
| 5 | 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)? | 3.5 J | 6.0 J | 22.5 J | 40 J | B |