At target practice, a rifle bullet is fired at an angle of 30° below the horizontal with an initial velocity of 800 m/s from the top of a cliff 80 m high
How far from the base of the cliff does it strike the level ground below if air resistance is negligible?
140 m
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Why is it believed that life can not evolve on a planet that orbits a spectral type A, B or O star?
a. These stars produce too much infrared radiation which would destroy carbon-based organisms. b. These stars have very small life zones. c. These stars are not capable of producing planets. d. These stars do not remain on the main sequence long enough for life to evolve. e. These stars take too long to form.
Two vehicles with equal magnitudes of momentum traveling at right angles to each other undergo an inelastic collision. The combined wreck moves in a direction
A) parallel to either of the cars before collision. B) at 45 degrees to the direction of either car before collision. C) at some angle other than 45 degrees.
Compared with the period of satellites in close Earth orbit, the period of satellites orbiting far from Earth is
A) shorter. B) the same. C) longer. D) need more information
The main source of energy for a star as it grows in size to become a red giant is
A) hydrogen fusion in the central core. B) helium fusion in the central core. C) hydrogen fusion in a shell surrounding the central core. D) gravitational contraction.