Kaitlin uses a bat to hit a thrown baseball. She knocks the ball back in the direction from which it came in a partially inelastic collision. The bat, which is heavier than the baseball, continues to move in the same direction after the hit as Kaitlin "follows through." Is the ball moving faster before or after it was hit?
a. The ball was moving faster before it was hit.
b. The ball was moving faster after it was hit.
c. The ball was moving at essentially the same speed before and after the hit.
d. There is insufficient information to answer this problem.
d
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Why do we expect the cosmic background radiation to be almost, but not quite, the same in all directions?
A) The overall structure of the universe is very uniform, but the universe must have contained some regions of higher density in order for galaxies to form. B) The temperature of the universe can be found by taking an average over the entire sky, but individual stars will create peaks in the spectrum over small angles. C) Dark matter consisting of WIMPs greatly smooths out the spectrum, but the small patches of "light" matter create peaks in the spectrum. D) The overall structure of the universe is very uniform, but the synthesis of different elements produces varying signatures within the background spectrum. E) The overall structure of the universe is very uniform, but intervening gas between us and the era of nuclei absorbs wavelengths depending on the composition and redshift of the gas.
The magnitude of a unit vector is one
Indicate whether the statement is true or false
Single-slit diffraction is characterized by
A) a distance between fringes which is independent of wavelength. B) decreasing angular separation of fringes as the order (m) increases. C) narrowing of diffraction pattern as slit width is reduced. D) rapid decrease in intensity of higher order fringes.
Which would burn your skin the most?
A) 100 g of water at 100°C B) 100 g of steam at 100°C C) both equal