While the gondola is rising at a speed of 5.0 m/s, a passenger in a balloon-supported gondola throws a small ball up at a speed of 2.0 m/s relative to his body. A person who measures the ball's velocity at the instant of release will find that the ball's velocity relative to the ground at that instant is
a. 2.0 m/s, up.
b. 2.8 m/s, down.
c. 3.0 m/s, up.
d. 5.0 m/s, up.
e. 7.0 m/s, up.
E
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The sound intensity level 5.0 m from a point source is 95 dB. At what distance will it be 75 dB?
A) 225 m B) 75 m C) 25 m D) 50 m
In a perfectly ELASTIC collision between two perfectly rigid objects
A) the momentum of each object is conserved. B) the kinetic energy of each object is conserved. C) the momentum of the system is conserved but the kinetic energy of the system is not conserved. D) both the momentum and the kinetic energy of the system are conserved. E) the kinetic energy of the system is conserved, but the momentum of the system is not conserved.
If there had never been any galactic collisions, all galaxies today would probably be ________
Fill in the blank(s) with correct word
Ninety percent of all stars fuse helium to form carbon and lie on the main sequence
Indicate whether the statement is true or false