Question 1: 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. 98 N
B. 490 N
C. 50 N
D. 0 N
E. 49 N
Question 2: The coefficient of kinetic friction between a 50 kg crate and the floor is 0.2. What horizontal force is required to move the crate at a constant velocity across the floor?
A. 490 N
B. 9.8 N
C. 0 N
D. 49 N
E. 98 N
Question 3: Two objects of masses of 1 kg and 5 kg are connected together by a light string that passes over a frictionless pulley. What is the acceleration of the block? Give your answer in m/s2 and do not enter units.
Question 4: Two objects of masses of 1 kg and 5 kg are connected together by a light string that passes over a frictionless pulley. What is the tension in the string? Give your answer in N and do not enter units.
Question 5: A 10 kg box slides down a 20 degree incline with a constant velocity. What is the coefficient of kinetic friction between the box and the surface of the incline?
Question 6: 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. 1.2 m/s2
B. 2.0 m/s2
C. 0.5 m/s2
D. 6.0 kg m/s2
E. 1.6 m/s2
Question 7: 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. four times the force as that on the first satellite
B. the same force as that on the first satellite
C. two times the force as that on the first satellite
D. one-quarter times the force as that on the first satellite
E. one-half times the force as that on the first satellite
Question 8: 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. 1.4 x 107 m/s2
B. 2.8 x 106 m/s2
C. 9.80 m/s2
D. 2.4 x 107 m/s2
E. 4.4 x 107 m/s2