An inertial frame of reference is a frame of reference that
A. is undergoing an acceleration
B. is not undergoing an acceleration
C. moves at the speed of light
D. is always at rest
B. is not undergoing an acceleration
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A ball bearing rolls along a smooth horizontal tabletop, and crashes head-on into a second ball bearing of half its mass. If both ball bearings roll in the x-direction only (either positive or negative) and the initially stationary ball bearing is observed to have a velocity of +2.4 m/s after the collision, what was the velocity of the first ball bearing after the collision?
A. -2.4 m/s B. +2.4 m/s C. -1.2 m/s D. +1.2 m/s E. -0.6 m/s F. +0.6 m/s
A police crime lab is trying to determine whether someone was murdered or died as a result of an accident. He was struck in the temple by a 4.20-kg sculpture that is alleged to have fallen off a bookcase. The sculpture presumably fell a distance of 1.43 m and the corner that struck him had an area of 0.250 cm2. If the time for the sculpture to stop was 1.00 ms, the pressure on his temple, in N/m2, was
A. 8.89 × 104. B. 1.65 × 105. C. 1.65 × 106. D. 8.89 × 108. E. 1.65 × 109.
At decoupling, the protons and electrons formed transparent hydrogen atoms, allowing the radiation to escape and become the present microwave background
Indicate whether the statement is true or false
A child has a temperature of 101°F. If her total cross-sectional area is 2 m2, find the energy lost each second (in W) due to radiation, assuming the emissivity is 1 . (Assume the room temperature is 70°F.)
a. 217 b. 180 c. 90 d. 68 e. 850