For general projectile motion with no air resistance, the horizontal component of a projectile's velocity
A) continuously decreases.
B) first decreases and then increases.
C) remains a non-zero constant.
D) remains zero.
E) continuously increases.
C
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Why do jovian planets bulge around the equator, that is, have a "squashed" appearance?
A) They are much more massive than the terrestrial planets. B) Their large systems of moons and rings gravitationally attract the mass around the equator more. C) Their rapid rotation flings the mass near the equator outward. D) Their internal heat sources exert a pressure against the sides of the planets. E) all of the above
If the wavelength of sound is increased by a factor of 3, what happens to its speed and frequency?
1.Its speed increases by a factor of 3, and so does its frequency. 2.Its frequency increases by a factor of 3, but the speed stays the same. 3.Its frequency decreases by a factor of 3, but its speed stays the same. 4.Its speed decreases by a factor of 3, and so does its frequency.
True or False: A photon is reflected from a mirror. Because a photon has zero mass, it does not exert a force on the mirror
1.True 2.False
What is the typical thermal energy of an electron in a solid at room temperature?
A. 0.00 B. 0.0010 eV C. 0.025 eV D. 0.27 eV E. 1.0 eV