Sliders are attached to the bottom of a 50 kg crate so that the crate slides wit

Question

Sliders are attached to the bottom of a 50 kg crate so that the crate slides without friction. What is the horizontal force required to keep the crate moving at a constant velocity on the floor in the absence of friction?


A. 0 N

B. 49 N

C. 490 N

D. 98 N

E. 50 N




A model train locomotive of mass 0.5 kg moves around a circular track of radius 50 m with a time period of 31.4 s. The radial acceleration of the locomotive is
A. 1.6 m/s2
B. 1.2 m/s2
C. 2.0 m/s2
D. 0.5 m/s2

E. 6.0 kg m/s2




A satellite circles the earth in a circular orbit of radius of R where R is the distance from the center of the earth. A second identical satellite circles in an orbit that is at twice the distance from the center of the earth (i.e. at a distance 2R) as compared to the first one. The gravitational force on the second satellite as compared to the first satellite is:
A. <!--[endif]-->the same force as that on the first satellite
B. one-half times the force as that on the first satellite
C. one-quarter times the force as that on the first satellite
D. two times the force as that on the first satellite
E. four times the force as that on the first satellite




A special kind of star called the white dwarf star which was once an average star like our sun, but is now at the end of its life having exhausted all its "fuel". Typical white dwarf stars give out very little light and are small in size. One such white dwarf in our universe has a mass equal to the mass of our sun (M = 2.0 x 1030 kg), and the radius that of the moon (r = 1.74x106 m). Find the acceleration due to gravity on the surface of this while dwarf.

A. 2.4 x 107 m/s2
B. 2.8 x 106 m/s2
C. 9.80 m/s2
D. 4.4 x 107 m/s2
E. 1.4 x 107 m/s2

Explanation / Answer

1. 0N because you have 0 acceleration 2. find the circumference. then the velocity by dividing the circumference by the time. then use v2/r

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