Mechanics Questions 4 Fall 2017 Please read carefully and answer properly Question Title * 1. Your Name: Question Title The next three questions refer to a toy car which is given a quick push so that it rolls up an inclined ramp. After it is released, it rolls up, reaches its highest point and rolls back down again. Friction is so small it can be ignored. Question Title * 2. The car is moving up the ramp after it is released. A B C D E F G J Question Title * 3. The car is at its highest point. A B C D E F G J Question Title * 4. The car is moving down the ramp. A B C D E F G J Question Title A bowling ball accidentally falls out of the cargo bay of an airliner as it flies along in a horizontal direction. Question Title * 5. As observed by a person standing on the ground and viewing the plane as in the figure above, which path would the bowling ball most closely follow after leaving the airplane? A B C D E Question Title * 6. An elevator is being lifted up an elevator shaft at a constant speed by a steel cable as shown in the figure below. All frictional effects are negligible. In this situation, forces on the elevator are such that: the upward force by the cable is greater than the downward force of gravity. the upward force by the cable is equal to the downward force of gravity. the upward force by the cable is smaller than the downward force of gravity. the upward force by the cable is greater than the sum of the downward force of gravity and a downward force due to the air. none of the above. (The elevator goes up because the cable is being shortened, not because an upward force is exerted on the elevator by the cable). Question Title Question Title The figure below shows a boy swinging on a rope, starting at a point higher than A. Consider the following distinct forces: 1. A downward force of gravity. 2. A force exerted by the rope pointing from A to O. 3. A force in the direction of the boy’s motion. 4. A force pointing from O to A. Question Title * 7. Which of the above forces is (are) acting on the boy when he is at position A? 1 only. 1 and 2. 1 and 3. 1, 2, and 3. 1, 3, and 4 Question Title USE THE STATEMENT AND FIGURE BELOW TO ANSWER THE NEXT FOUR QUESTIONSA rocket drifts sideways in outer space from point "a" to point "b" as shown below. The rocket is subject to no outside forces. Starting at position "b", the rocket's engine is turned on and produces a constant thrust (force on the rocket) at right angles to the line "ab". The constant thrust is maintained until the rocket reaches a point "c" in space. Question Title Which path below best represents the path of the rocket between points "b" and "c"? Question Title * 8. Please pick the letter of the correct path A B C D E Question Title * 9. As the rocket moves from position "b" to position "c", its speed is: constant. continuously increasing. continuously decreasing. increasing for a while and constant thereafter. constant for a while and decreasing thereafter. Question Title At point "c" the rocket's engine is turned off and the thrust immediately drops to zero. Which of the paths below will the rocket follow beyond point "c"? Question Title * 10. Please pick the correct path for after the thrust stops. A B C D E Question Title * 11. Beyond position "c" the speed of the rocket is: constant. continuously increasing. continuously decreasing. increasing for a while and constant thereafter. constant for a while and decreasing thereafter. Done