A 55-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.30. A horizontal 140-N force is exerted on the box. What is the friction force exerted by the surface on the box?
A) 140 N
B) 160 N
C) 16.5 N
D) 0.00 N
E) 42 N
A
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What is in the box shown below? 
A. Positive charge B. Negative charge C. Zero charge D. One cannot determine the charge’s sign from this diagram.
The fastest we could accelerate a nuclear-powered rocket to is approximately
A) 50% of the speed of light B) 0.001% of the speed of light C) 0.1% of the speed of light D) 10% of the speed of light
An iron robot falls from rest at a great height. Neglecting air resistance, what is its speed after it has fallen for 3.5 seconds?
A. 34.3 m/s B. 9.8 m/s C. 13.3 m/s D. 9.8 m/s2
The fact that you can see stars in the nighttime sky is evidence that
A) our atmosphere is transparent to visible light. B) light can travel in a vacuum. C) both of these D) neither of these