Which of the following is true of a light-year(ly)?
A) It is a unit of time.
B) It is a unit of mass.
C) It is a smaller unit of distance than kilometers.
D) It is a larger unit of distance than the astronomical unit.
D
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Which of the following statements best describes the line of stability?
Glass panes are opaque to a certain type of radiation, which can cause sunburn. What type of radiation is it? This radiation is important in ozone layer reactions
a. gamma c. X-ray b. ultraviolet d. microwave
A mass of 0.40 kg, hanging from a spring with a spring constant of 160 N/m, is set into an up-and-down simple harmonic motion. What is the speed of the mass when moving through the equilibrium point? The starting displacement from equilibrium is 0.10 m
a. zero c. 2.0 m/s b. 1.4 m/s d. 3.4 m/s
Water ripples are produced by making a cork oscillate up and down at a frequency of 5 Hz. The peaks of the ripples are 0.03 meters apart. What is the speed of the water ripples?