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The following physics responses are provided by a student and, as such, should be considered in that context. While every effort is made for accuracy, absolute correctness cannot be fully guaranteed.
| C | I | Question | Answer |
|---|---|---|---|
| 8 | A bowling ball has a mass of 7.0 kg, a moment of inertia of 2.8*10^-2 kg×m2 and a radius of 0.10 m. If it rolls down the lane without slipping at a linear speed of 4.0 m/s, what is its angular speed? | 40 rad/s | |
| 11 | The surfaces of a Dewar flask are silvered for the purpose of minimizing heat transfer by what process? | radiation | |
| 4 | An astronaut applies a force of 500 N to an asteroid, and it accelerates at 7.00 m/s2. What is the asteroid's mass? | 71kg | |
| 6 | At liftoff, the engines of the Saturn V rocket consumed 13 000 kg/s of fuel and exhausted the combustion products at 2 900 m/s. What was the total upward force (thrust) provided by the engines? | 3.77*10^7 N | |
| 8 | A ventilation fan with a moment of inertia of 0.034 kg*m^2 has a net torque of 0.11 N*m applied to it. What angular acceleration does it experience? | 3.2 rad/s^2 | |
| 11 | When a wool blanket is used to keep warm, what is the primary insulating material? | air | |
| 4 | A 20-kg traffic light hangs midway on a cable between two poles 40 meters apart. If the sag in the cable is 0.40 meters, what is the tension in each side of the cable? | 4900N | |
| 6 | A 1 000-kg experimental rocket sled on level frictionless rails is loaded with 50 kg of propellant. It exhausts the propellant in a 20-s "burn." If the rocket, initially at rest, moves at 150 m/s after the burn, what impulse is experienced by the rocket sled? | 1.5*10^5 kg*m/s | |
| 8 | A baseball pitcher loosens up his pitching arm. He tosses a 0.15-kg ball using only the rotation of his forearm, 0.32 m in length, to accelerate the ball. If the ball starts at rest and is released with a speed of 12 m/s in a time of 0.40 s, what torque is applied to the ball while being held by the pitcher's hand to produce the angular acceleration? | 1.4 Nm | |
| 11 | On a sunny day at the beach, the reason the sand gets so hot and the water stays relatively cool is attributed to the difference in which property between water and sand? | specific heat | |
| 4 | Two blocks, joined by a string, have masses of 6.0 and 9.0 kg. They rest on a frictionless horizontal surface. A 2nd string, attached only to the 9-kg block, has horizontal force = 30 N applied to it. Both blocks accelerate. Find the tension in the string between the blocks. | 12N | |
| 6 | A billiard ball collides in an elastic head-on collision with a second stationary identical ball. After the collision which of the following conditions applies to the first ball? | comes to rest | |
| 8 | According to Newton's second law, the angular acceleration experienced by an object is directly proportional to: | the net applied torque. | |
| 11 | How much heat energy must be removed from 100 g of oxygen at 22°C to liquefy it at -183°C? (The specific heat of oxygen gas is 0.218 cal/g×°C, and its heat of vaporization is 50.9 cal/g.) | 9560 cal | |
| 4 | Find the tension in an elevator cable if the 1 000-kg elevator is descending with an acceleration of 1.8 m/s2, downward. | 8000N |