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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 |
|---|---|---|---|
| 6 | An object of mass m moving at speed v0 strikes and object of mass 2m which had been at rest. The first object bounces backward along its initial path at speed v0. Is this collision elastic, and if not, what is the change in kinetic energy of the system? | The kinetic energy increases by mv^2. | |
| 6 | Ann the Astronaut weighs 60 kg. She is space walking outside the space shuttle and pushes a 350-kg satellite away from the shuttle at 0.90 m/s. What speed does this give Ann as she moves toward the shuttle? | 5.3 m/s | |
| 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 | |
| 6 | During a snowball fight two balls with masses of 0.4 and 0.6 kg, respectively, are thrown in such a manner that they meet head-on and combine to form a single mass. The magnitude of initial velocity for each is 15 m/s. What is the speed of the 1.0-kg mass immediately after collision? | 3 m/s | |
| 6 | If a glass of water is on a table with a piece of paper under it, it is relatively easy to pull the paper out without disturbing the glass very much if the pull is done very quickly. This is because, with a quick pull: | the time for the pull will be less. | |
| 6 | If a two-body collision is not head-on, then we may always assume that: | momentum is conserved. | |
| 6 | If the momentum of an object is tripled, its kinetic energy will change by what factor? | nine | |
| 6 | In a partially elastic collision between two objects with unequal mass: | the momentum of one will increase by the amount that the momentum of the other decreases. | |
| 6 | In a system with two moving objects, when a collision occurs between the objects: | the total momentum is always conserved. | |
| 6 | In a two-body collision, if the kinetic energy of the system is conserved, then which of the following best describes the momentum after the collision? | must also be conserved | |
| 6 | In a two-body collision, if the momentum of the system is conserved, then which of the following best describes the kinetic energy after the collision? | may also be conserved | |
| 6 | Jerome pitches a baseball of mass 0.20 kg. The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Jerome with a return speed of 60 m/s. What is the magnitude of change in the ball's momentum? | 20 kg*m/s | |
| 6 | Kaitlin uses a bat to hit a thrown baseball. She knocks the ball back in the direction from which it came in a partially inelastic collision. The bat, which is heavier than the baseball, continues to move in the same direction after the hit as Kaitlin "follows through." Is the ball moving faster before or after it was hit? | There is insufficient information to answer this problem. | |
| 6 | Lonnie pitches a baseball of mass 0.20 kg. The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Lonnie with a return speed of 60 m/s. If the bat is in contact with the ball for 0.050 s, what is the impulse experienced by the ball? | 20 N*s | |
| 6 | Mitch throws a 100-g lump of clay at a 500-g target, which is at rest on a horizontal surface. After impact, the target, including the attached clay, slides 2.1 m before stopping. If the coefficient of friction is μ = 0.50, find the speed of the clay before impact. | 27 m/s |
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