To help keep buildings cool in the summer, dark colored window shades have been replaced by light colored shades. This is because light colored shades:
A. are more pleasing to the eye
B. absorb more sunlight
C. reflect more sunlight
D. transmit more sunlight
E. have a lower thermal conductivity
Answer: C. reflect more sunlight
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Supermassive black holes are believed to be located at the center of many galaxies because
a. the rotation curve of the galaxy indicates that 90% of the galaxy is dark matter. b. the orbital motion of material near the center is very fast and indicates a very massive core. c. the shape of the bulge in all spiral galaxies can only be supported by a supermassive black hole. d. the spiral structure requires a black hole to maintain the spiral arms. e. the orbital speeds of a globular clusters in the galaxy are greater than the speed of light.
Projectile Motion: Enzo throws a rock horizontally with a speed of 12 m/s from a bridge. It falls for 2.28 s before reaching the water below with no appreciable air resistance. Just as the rock reaches the water, find(a) the horizontal component of its velocity.(b) the speed with which it is moving.
What will be an ideal response?
Which of the following is an ion?
A) 2 H2 B) Br2 C) HCl D) Au + 3 Br2 E) none of the above
How many nodes and antinodes are shown in the standing wave above?
a. two nodes and three antinodes b. one node and two antinodes c. one-third node and one antinode d. three nodes and two antinodes