All of the following statements are true. Which one provides strong observational support for the claim that greenhouse gases make a planet warmer than it would be otherwise?
A) Venus has a higher average temperature than Mercury.
B) Earth is the only planet with an ozone layer in its atmosphere.
C) Earth has a higher average temperature than Mars.
D) Mercury is much hotter than the Moon.
A
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A 6-kg bowling ball moving at 3 m/s collides with a 1.4-kg bowling pin at rest. How do the magnitudes of the forces exerted by the collision on each object compare?
A. The force on the pin is larger than the force on the ball. B. The force on the ball is larger than the force on the pin. C. Both objects experience the same magnitude of force. D. The collision exerts no force on the ball. E. There is no way to tell.
A car moving east collides with a truck moving north. The vehicles have the same speed but the truck has twice the mass of the car. If the vehicles stick together after the collision, what is the path followed by the vehicles after the collision?
A. A B. B C. C D. D E. E
A pendulum has how many natural frequencies?
Suppose you built a scale-model atom in which the nucleus was the size of a tennis ball. About how far would the cloud of electrons extend?
A) several centimeters B) a few meters C) a few tens of meters D) several kilometers E) to the Sun