I19pts] write the formula for, and describe with words: (a) The work-energy theo
ID: 1605301 • Letter: I
Question
I19pts] write the formula for, and describe with words: (a) The work-energy theorem, and the principle of conservation of energy (pay attention to the assumptions needed for this theorem to be valid) when only constant to ces oct on a system the sum of the KE and PE do not change 15 ptsl Tom is running around an olympic race track at constant speed. In which sections ofthe track does he have zero tangential velocity? (Mark all that applies) (a) In the curved sections VT *o Both CTom IS (b) In the straight sections In which sections does he have zero tangential acceleration? (Mark all that applies) V (c) In the curved sections (d) In straight sections 5. 15 ptsl A ring, a solid sphere, and a hollow sphere each have the same massmandadias The three objects are arranged so that an axis of rotation passes through the center of each object(and is perpendicular to the plane of the ng. Which of the three objects has the smallest moment of inertia? (a) The disk has the smallest moment of inertia. keby disk and hollow sphere have the same moment of inertia, and itisthe smallest. (c) The solid sphere and hollow sphere have the same moment of inertia and it is the smallest The hollow sphere has the smallest moment of inertia. (e) The solid sphere has the smallesr moment of inertia. sl Five hockey pucks are across ice in the right direction. The drawing shows atop view the pucks and the three forces that act each one. As the forces have diferent magnitudes, and are applied at different points on the pucks Circle all the pucks that are rotating clockwise. arnone does write "NONE DOES 7. 15 ptsl Five simple pendulums are shown in the drawings The lengths ofthe pendulums are drawn to scale, and the masses are either m or 2m, as shown. Which pendulum has laruest it. Page 24Explanation / Answer
12.
x = distance by which the ball falls and spring gets stretched
using conservation of energy
spring potential energy = potential energy of ball initially
(0.5) k x2 = mg x
(0.5) (28) x2 = (0.30) (9.8) x
x = 0.21 m