What is the longest-lasting internal heat source responsible for geological activity?

a. accretion
b. radioactive decay
c. sunlight


Answer: b. radioactive decay

Physics & Space Science

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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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science