In which position(s) of the Moon do we experience the lowest low tides?
A) 1
B) 2
C) 3
D) 4
E) 1 and 3
F) 2 and 4
E) 1 and 3
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A satellite encircles Mars at a distance above its surface equal to 3 times the radius of Mars. If gm is the acceleration due to gravity at the surface of Mars, what is the acceleration due to gravity at the location of the satellite?
A) gm/9 B) 0 C) gm D) gm/3 E) gm/16
Which of the following is a result of particles of antimatter colliding with particles of normal matter?
A) The formation of a large particle of normal matter B) The conversion of the mass of the particles into energy C) The formation of a large particle of antimatter D) The creation of new, more massive particles
The astronaut's experiment with the hammer and the feather illustrate that:
a. hammers and feathers have the same mass on the Moon. b. hammers and feathers have the same weight on the Moon. c. objects of different size, shape, and mass fall at the same rate in a vacuum. d. the absence of air on the Moon results in different rules of physics. e. there is no gravity on the Moon.
Which of the following cases in the Drake equation would be the minimum necessary condition for us to be the only intelligent civilization currently in our galaxy?
A) any two of the factors to be zero B) any three of the factors to be zero C) all of the factors to be zero D) any one of the factors to be zero