We define the total mechanical energy of an object as
a. potential energy plus kinetic energy.
b. inertial energy plus kinetic energy.
c. gravitational energy plus potential energy.
d. mental energy plus physical energy.
a
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How do globular clusters tell the Sun's spot in the Milky Way?
A: It's actually the positions of the open clusters that provide information. B: Their velocities can be used to determine their orbits. C: They are spherically distributed around the center of the Milky Way. D: Their colors indicate how far away they are from the center. E: They whisper it to you if you ask really nicely.
If the mass of the Sun were smaller by a factor of 1/3, how would the force between the Sun and the Earth change?
A) it would remain unchanged B) it would decrease by a factor of three C) it would triple D) it would decrease by a factor of nine E) it would be nine times more
A railroad car collides with and sticks to an identical railroad car that is initially at rest. After the collision, the kinetic energy of the system
A) is the same as before. B) is half as much as before. C) is one third as much as before. D) is one fourth as much as before. E) is one quarter as much as before.
A slide projector is designed with its lens 6.0 m from the screen. The projected image is 1.5 m square of a slide object 2.5 cm square
(a) What is the object distance from the lens? (b) What should be the lens focal length? (c) What is the lens POWER?