A 320-g air track cart traveling at 1.25 m/s collides elastically with a stationary 270-g cart. What is the speed of the 320-g cart after the collision?
A) 0.678 m/s
B) 0.106 m/s
C) 0.212 m/s
D) 1.36 m/s
E) 1.14 m/s
B
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If the Sun ceased to generate nuclear fusion in its core, the Sun would immediately begin to collapse inward
a. True b. False Indicate whether the statement is true or false
Which characteristic of Earth explains why Earth has the ozone necessary for an ultraviolet-absorbing stratosphere?
A) the existence of photosynthetic life B) the existence of plate tectonics C) the moderate surface temperature D) the existence of oceans
Do explosions conserve momentum?
A. No, because objects can go from stationary to moving. B. Only for rockets. C. Only if the original object is stationary. D. Yes, because all forces are internal to the system.
Mutations are
A) sometimes caused by radioactivity. B) important in the operation of evolution. C) Both of the above. D) None of the above. E) mostly caused by eating pizza.