9. In the pulley system shown, all the pulleys are massless and frictionless and the rope is of negligible mass. Aristotle wanted to raise the 262-newton weight to a height of 3.00 meters. (a) Find the magnitude of force F he needed to pull on the rope to move the weight upward with a constant velocity. (b) What was the mechanical advantage of the pulley system? (c) How far did he have to move his end of the rope? (d) How much work did he do? (e) How much work was done on the weight? 262 N

An old miser with a bag og gold jums onto the surface of a frozen lake and hopes to coast civilization on the other side.Unfortunately the ice does have a coefficient of kinetic friction ?ₖ=0.08. He slides for 80 m and then stops.(Now he has to walk.) How fast was he moving at the start of his coast?

The 4,450kg truck is traveling at 30.50m/s when the brakes on all its wheels are applied, causing it to skid for a distance of 22m before coming to rest. Calculate the constant horizontal force developed in the coupling C, as well as the frictional force developed between the tires of the truck and the road during this time. The combined mass of the boat and trailer is 2,250kg * Choose from the choices below.         47.57kN & 141.64kN       51.25kN & 135.88kN       40.75kN & 133.75kN       50.75kN & 135.88kN

A 73-kg block of wood needs to be pulled across an unpolished wood floor at a constant velocity in 3.5 minutes. If the floor is 78.4 meters long, how powerful does the person have to be to push the block? (μ = 0.16) Show your work. Answer choices: (a) 42 W (b) 1.60 x 104 W (c) 27.3 W (d) 1.88 x 106 W

Objects with masses m1=15.0kg and m2=6.0 kg are connected by a light string that passes over a frictionless pulley as in the figure below. Find the final speed of the blocks when the block m1 moves down a distance of 1.3 m. Assume that the system starts from rest. (Use conservation of energy)

The force of attraction on an object below Earth’s surface is directly proportional to its distance from Earth’s center. Find the work done in moving a weight of w lb located a mi below Earth’s surface up to the surface itself. Assume Earth’s radius is a constant r mi.

In the figure, two blocks are connected over a pulley. The mass of block A is 8.30 kg and the coefficient of kinetic friction between A and the incline is 0.310. Angle e of the incline is 32.0. Block A slides down the incline at constant speed. What is the mass of block B? Frictionles, massless puilley Number Units Attempts: 0 of 5 used Submit Anwer Save for Later Last saved 14 hours ago. Saved work will be auto-subrnitted on the due date. Auto- submission can take up to 10 minutes. Using multiple attempts will impact your score. 20% score reduction after attempt 4

An 69 kg man runs up stairs and reaches 10 mheight for 14 s. what is his power? Use g = 9.8 m/s2 Calculate answer to one decimal.

An 64 kg man runs up stairs and reaches 9 mheight for 12 s. what is his power? Use g = 9.8 m/s2 Calculate answer to one decimal.

A tired squirrel (mass 1 kg) does push-ups by applying a force to elevate its center-of-mass by 5 cm. Determine the number of push-ups which a tired squirrel must do in order to do a mere 1.0 Joule of work.