In the absence of a greenhouse effect, what would happen to Earth's oceans?
a. They would evaporate.
b. They would freeze over.
c. They would be rapidly absorbed into the surface rocks.
d. They would dissociate into ozone and hydrogen.
b. They would freeze over.
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Gravitational Force: What is the gravitational force acting on a 59-kg person due to another 59-kg person standing 2.0 m away? We can model each person as a small sphere. (G = 6.67 × 10-11 N ? m2/kg2)
A. 5.8 × 10-8 N B. 8.5 × 103 N C. 1.2 × 10-7 N D. 9.8 × 10-10 N E. 2.0 × 10-9 N
A 120 N force is applied at an angle of 30.0 degrees above the horizontal to a 4.00 kg box. The box moves a horizontal distance of 8.00 meters. The change in the kinetic energy of the box is
A. 667 J. B. 750 J. C. 831 J. D. 890 J. E. 920 J.
Two balls have the same size and surface texture, but one is twice as heavy as the other. How many times larger is the terminal speed of the more massive ball falling through air than that of the lighter ball?
A. The balls fall with the same speed in air. B. The massive ball’s terminal speed is [2]1/2 times larger than the other’s. C. The massive ball’s terminal speed is 2 times larger than the other’s. D. The massive ball’s terminal speed is 4 times larger than the other’s. E. The massive ball’s terminal speed is some other multiple of the other’s (specify).
An innocent mosquito is flying along the interstate and has a collision with a speeding semi. Which one feels a greater force?
A. The mosquito B. The semi C. They both feel the same force D. There are no forces involved