What is the longest-lasting internal heat source responsible for geological activity?
a. accretion
b. radioactive decay
c. sunlight
Answer: b. radioactive decay
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The gravitational force between two metal spheres in outer space is 1000 N. How large would this force be if each of the two spheres had twice the mass?
A. 1000 N B. 2000 N C. 4000 N D. 16,000 N
The total amount of light from a star-planet system drops when the planet goes behind the star
Indicate whether the statement is true or false
A 3.0-kg mass and a 5.0-kg mass hang vertically at the opposite ends of a very light rope that goes over an ideal pulley. If the masses are gently released, what is the resulting acceleration of the masses?
A) 0.00 m/s2 B) 3.7 m/s2 C) 2.5 m/s2 D) 4.9 m/s2 E) 6.1 m/s2
A car approaches a stationary police car at 36 m/s. The frequency of the siren (relative to the police car) is 500 Hz. What is the frequency (in Hz) heard by an observer in the moving car as he approaches the police car? (Assume the velocity of sound in air is 343 m/s.)
a. 220 b. 448 c. 526 d. 552 e. 383