Spherical Mirrors: An object that is 4.0 cm tall is placed 15 cm in front of a concave mirror of focal length 20 cm.(a) Where is the image formed and how far is it from the mirror?(b) How tall is the image?
What will be an ideal response?
(a) 60 cm behind the mirror (b) 16 cm
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Impulse: Three cars, car X, car Y, and car Z, begin accelerating from rest at the same time. Car X is more massive than car Y, which is more massive than car Z. The net accelerating force exerted on each car is identical. After 10 seconds, which car has the most amount of momentum?
A. They all have the same amount of momentum. B. Car X C. Car Y D. Car Z
What observational evidence supports the galactic fountain model, which describes how gas cycles between the disk of the galaxy and regions high above the disk?
A) We see hot gas high above the region of the disk near our solar system, along with cool gas that appears to be raining down from the halo. B) We have discovered a jet of ionized gas shooting out of the bulge of our galaxy. C) We have discovered that the entire galactic disk is being uniformly "rained on" by cool gas coming from the halo. D) We have observed a lot of water molecules in the interstellar medium.
When we analyze whether a world is a possible home to life, the key thing we look for is ________
A) surface coloration changes that could indicate vegetative growth B) evidence of atmospheric oxygen C) the past or present existence of liquid water D) the presence of organic molecules such as amino acids
If y = 0.02 sin (30x ? 400t) (SI units) and if the mass density of the string on which the wave propagates is 0.005 kg/m, then the transmitted power is
a. 1.03 W. b. 2.13 W. c. 4.84 W. d. 5.54 W. e. 106 W.