According to the universal law of gravitation, if you triple the distance between two objects, then the gravitational force between them ________
A) decreases by a factor of 3 B) decreases by a factor of 9
C) increases by a factor of 9 D) increases by a factor of 3
B
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Nuclear Reactions: In the nuclear reaction 
K + 
H ? X + 
Ca, what is X?
A. proton B. neutron C. 2H D. 3H E. alpha particle
Which statement best describes what was called the solar neutrino problem?
A) Early experiments designed to detect solar neutrinos found them, but in fewer numbers than had been expected. B) It referred to the fact that neutrinos are extremely difficult to detect. C) Our understanding of fusion in the Sun suggested that neutrinos should be destroyed before they arrive at Earth, yet neutrinos were being detected. D) No one understood how it could be possible for neutrinos to be produced in the Sun.
A 5.0-kg object is pulled along a horizontal surface at a constant speed by a 15-N force acting 20° above the horizontal. How much work is done by this force as the object moves 6.0 m?
a. 78 J b. 82 J c. 85 J d. 74 J e. 43 J
Defects in the subsequent offspring of the recipient of radiation are called ______________ effects
a. genetic b. latent c. somatic d. threshold