Because of the equivalence of energy and mass, a gamma ray, which is a high energy photon, can "disappear," and in its place there will be produced an electron and a positron, which both have mass
Indicate whether the statement is true or false
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An astronaut measures her mass by means of a device consisting of a chair attached to a large spring. The period of oscillation she undergoes when set into motion is used to determine her mass. If the spring constant is 1250 N/m and 27 seconds is required for her to undergo 10 full oscillations what is the mass of the astronaut and chair?
A. 231 kg B. 537 kg C. 85.5 kg D. 171 kg
A rock is thrown at a window that is located 18.0 m above the ground. The rock is thrown at an angle of 40.0° above horizontal. The rock is thrown from a height of 2.00 m above the ground with a speed of 30
0 m/s and experiences no appreciable air resistance. If the rock strikes the window on its upward trajectory, from what horizontal distance from the window was it released? A) 53.2 m B) 48.7 m C) 71.6 m D) 29.8 m E) 27.3 m
Mechanical energy
a. is always the total energy of a system. b. is the sum of the energies of motion and position. c. is always conserved. d. necessarily involves gravitational potential energy.
When a star collapses to half size, the gravitational field at its surface
A) doubles. B) quadruples. C) increases eightfold. D) remains constant.