What is the main factor that makes Earth more geologically active than the other terrestrial planets?
A) It is larger, so it has retained its internal heat for longer.
B) It is farthest from the Sun, so it receives less light.
C) It has a large Moon, so it is heated by tidal forces.
D) It has far more radioactive material than other planets.
E) It formed much later than the other planets.
A) It is larger, so it has retained its internal heat for longer.
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A force of 20 N is applied to a wire with an un-stretched length of 2.5 m. The wire gets 2.00 mm longer. The strain in the wire is
A. 
B. 
C. 
D. 
E. 
Two identical vertical springs S1 and S2 have masses m1 = 400 g and m2 = 800 g attached to them. If m1 causes spring S1 to stretch by 4 cm, what is the ratio of the potential energy of S1 and S2? Use g = 10 m/s2
A) 2:1 B) 1:2 C) 1:3 D) 4:1 E) 1:4
A star is 10 parsecs from Earth. Which statement is true?
A) The star's apparent magnitude is larger than its absolute magnitude. B) The star is about 33 ly away. C) The star's parallax is 1.0 arc seconds. D) The star's apparent magnitude is smaller than its absolute magnitude. E) The star is in a different galaxy.
A vibrating guitar string emits a tone simultaneously with one from a 495-Hz tuning fork. If a beat frequency of 5.00 Hz results, what is the frequency of vibration of the string?
a. 2 480 Hz b. 500 Hz c. 490 Hz d. 250 Hz e. Either choice b or c is valid.