Immediately after the Big Bang, how many types of interaction were there?
A. 0
B. 1
C. 2
D. 3
E. 4
B. 1
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A satellite orbits the Earth once every 6.0 hours in a circle. What is the acceleration of the satellite (direction too)?
What will be an ideal response?
Mass on a Spring: A 0.50-kg object is attached to an ideal spring of spring constant (force constant) 20 N/m along a horizontal, frictionless surface. The object oscillates in simple harmonic motion and has a speed of 1.5 m/s at the equilibrium position. At what distance from the equilibrium position are the kinetic energy and potential energy of the system the same?
A. 0.017 m B. 0.029 m C. 0.12 m D. 0.17 m
Two balls, A and B, of mass m and 2m respectively, are carried to height h at constant velocity, but B rises twice as fast as A. The work the gravitational force does on B is
a. one quarter the work done on A. b. one half the work done on A. c. the same as the work done on A. d. twice the work done on A. e. four times the work done on A.
The detectors on the Spitzer Space Telescope were cooled to near absolute zero in order to:
A) allow the electronics in these instruments to operate most efficiently. B) keep the telescope more nearly stationary. C) prevent the infrared radiation from the instruments interfering with the infrared signals from space. D) improve the angular resolution of the telescope.