Which of the following is an example of re?ection or scattering?
A) Red light hits a red sweatshirt. B) Visible light does not pass through a black wall.
C) Light comes from your computer screen. D) Blue light hits a red sweatshirt.
A
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A 0.30-m-radius automobile tire accelerates from rest at a constant 2.0 rad/s2 . What is the centripetal acceleration of a point on the outer edge of the tire after 5.0 s?
a. 300 m/s2 b. 33 m/s2 c. 30 m/s2 d. 3.0 m/s2
Does the change in speed of light when it enters a material substance indicate that light is more like a wave or more like a particle of the kind considered by Newton?
a. More like a wave. b. More like a particle. c. It varies from material to material. d. Similar to both. e. Not at all like either one.
What is the angular momentum of the Moon about the Earth? The mass of the Moon is 7.35 × 1022 kg, the center-to-center separation of the Earth and the Moon is 3.84 × 105 km, and the orbital period of the Moon is 27.3 days. Ignore the small offset of the center of mass of the system from the center of the Earth in your calculation.
What will be an ideal response?
Although the entire universe may be much larger than our observable universe, we can see only within our observable universe. The "boundary" of our observable universe is called
A) the cosmological horizon. B) the Big Bang. C) the lookback time. D) the singularity.