The sound of a jet engine is given as 120 dB. What is the intensity of the jet sound wave?
A. 1.0 W/m2
B. 0.8 W/m2
C. 0.6 W/m2
D. 0.4 W/m2
E. 0.2 W/m2
A. 1.0 W/m2
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The amount that light of a distant galaxy is bent by the gravity of a nearby cluster of galaxies
A: allows us to measure the mass of the cluster. B: proves that dark matter does not exist in clusters. C: allows us to measure the mass of the galaxy.
Describe and compare the modes of heat loss through the single-pane and double-pane window assemblies shown in the sketch below.
GIVEN
- A single-pane and a double-pane window assembly
FIND
(a) The modes of heat transfer for each
(b) Compare the modes of heat transfer for each
ASSUMPTIONS
- The window assembly wood casing is a good insulator
SKETCH
A ball is thrown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming down
A) Both its velocity and its acceleration point upward. B) Its velocity points upward and its acceleration points downward. C) Its velocity points downward and its acceleration points upward. D) Both its velocity and its acceleration point downward. E) Neither velocity nor acceleration can be determined without additional information.
One of the results of wave refraction is that
A) wave energy is concentrated at headlands that project into the water. B) wave energy is concentrated in the recessed parts of the coast between headlands. C) sediment is deposited in the vicinity of headlands, making them larger. D) wave energy is dissipated before the waves reach the shoreline.