Earth exerts a gravitational force of 7000 N on one of the communications satellites. What force does the satellite exert on Earth?
A. more than 7000 N
B. 7000 N
C. less than 7000 N
D. zero
Ans: B. 7000 N
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A 4.00 kg mass is located at (2.00 m, 2.00 m, 0.00 m) and a 3.00 kg mass is located at (–1.0 m, 3.00 m, 0.00 m). If this system of masses rotated about the X-axis perpendicular to the Z-Y plane, then the moment of inertia of this system is
A. 24 kg 
B. 36 kg
C. 43 kg
D. 56 kg
E. 62 kg
The initial speed of a cannon ball is 0.20 km/s. If the ball is to strike a target that is at a horizontal distance of 3.0 km from the cannon, what is the minimum time of flight for the ball?
a. 16 s b. 21 s c. 24 s d. 14 s e. 19 s
Compare two diverging lenses similar except that lens B is rated at 20 Diopters, whereas lens A is rated at 10 Diopters. The focal length of lens B is
A) twice the focal length of lens A. B) one-fourth of the focal length of lens A. C) one-half of the focal length of lens A. D) 1/ of the focal length of lens A. E) four times the focal length of lens A.
How do you determine if a particular torque should be considered + (positive) or – (negative)?