Multiple Choice
A box with a weight of 50 N rests on a horizontal surface.A person pulls horizontally on it with a force of 15 N and it does not move.To start it moving, a second person pulls vertically upward on the box.If the coefficient of static friction is 0.4, what is the smallest vertical force for which the box moves?
A) 5 N
B) 12 N
C) 20 N
D) 25 N
E) 35 N
Correct Answer:

Verified
Correct Answer:
Verified
Q5: A baseball has a terminal speed of
Q15: The speed of a 4.0-N hockey puck,
Q21: One end of a 1.0-m long string
Q32: Why do raindrops fall with constant speed
Q47: In uniform circular motion,<br>A)the acceleration always points
Q51: A horizontal shove of at least 200-N
Q54: A 24-N horizontal force is applied to
Q60: Block A, with a mass of
Q66: A 40-N crate rests on a rough
Q74: A block is placed on a rough