A 12-kg crate rests on a horizontal surface and a boy pulls on it with a force that is 30◦ below the horizontal. If the coefficient of static friction is 0.40, the minimum magnitude force he needs to start the crate moving is: Choices: 54N 47N 71N 44N 56N   Show complete solution and free body diagram

A 2.88 kg mass begins at rest and slides 2.84 m down an incline of 49.6 degree in a time of 1.61 s. What is the coefficient of kinetic friction regarding this system if only the force due to gravity, the force of kinetic friction, and the normal force are considered? Enter a number rounded to 3 decimal places

A 2N force acts on a 10N block that is initially at rest on a horizontal surface. The coefficient of static friction between the block and the surface is 0.50.  What is the magnitude of the frictional force on the block? A)0N, B)2N, C) 5N, D)8N, E)10N

When a parachute opens, the air exerts a large drag force on it. This upward force is initially greater than the weight of the sky diver and, thus, slows him down. Suppose the weight of the sky diver is 986 N and the drag force has a magnitude of 1049 N. The mass of the sky diver is 101 kg. Take upward to be the positive direction. What is his acceleration, including sign? Type to search 7 Number e Textbook and Media Save for Later 2 +6.24 W Ri 3 E C $ 4 " Units R % 5 m/s^2 T V 6 & 7 7 H * Attempts: 2 of 3 used Submit Answer 8 81°F Partly sunny 0 K 2:41 6/2/