A speed boat requires 61 kW to move at a constant speed of 28 m/s. What is the resistive force in Newtons of the water at this speed

Your forehead can withstand a force of about 6.0 kN before fracturing, while your cheekbone can withstand only about 1.3 kN. Suppose a 140 g baseball traveling at 27 m/s strikes your head and stops in 1.1 ms What force does the baseball exert on your head? What is the magnitude of the force that stops the baseball?

If a 2.3 kg object is initially at rest on a frictionless, horizontal surface and subjected to a  10.2 N force in the positive x-direction over a distance of 4.1 meters, what will the object’s  final speed be? Assume the answer in in m/s.

If a 2 kg object is initially at rest on a frictionless, horizontal surface and subjected to a  13.7 N force in the positive x-direction over a distance of 3.25 meters, what will the object’s  final speed be? Assume the answer in in m/s.

A 149-g baseball is dropped from a tree 15.0 m above the ground. a) With what speed would it hit the ground if air resistance could be ignored? b) If it actually hits the ground with a speed of 8.00 m/s , what is the magnitude of the average force of air resistance exerted on it?

A small diamond of mass 13.3 g drops from a swimmer's earring and falls through the water, reaching a terminal velocity of 2.1 m/s.   (a) Assuming the frictional force on the diamond obeys f = −bv, what is b (in kg/s)? (Round your answer to at least four decimal places.)  kg/s   (b) How far (in m) does the diamond fall before it reaches 90 percent of its terminal speed?  m

What is the magnitude of the force that stops the baseball? What force does the baseball exert on your head? Are you in danger of a fracture if the ball hits you in the forehead? On the cheek?

The man slides the 180-lb crate across the floor by pulling with a constant force of 30 lb. If the crate was initially at rest, how far will the crate move before its speed is 4.0 ft/s? The coefficient of kinetic friction between the crate and the floor is 0.15.

a 925-kg pick up decelerates to rest from a speed of 97.5 km/h in a distance 125 m. Suppose the pick up is initially traveling in the positive direction. suppose instead of breaking that the pick up hits a concrete abutment at full speed is brought up to a stop at 2.0 m. Calculate the force in newtons exerted on the pickup in this case.

A 74507450‑kg car is travelling at 28.728.7 m/s when the driver decides to exit the freeway by going up a ramp. After coasting 404404 m along the exit ramp, the car's speed is 13.513.5 m/s, and it is ℎ=10.7h=10.7 m above the freeway. What is the magnitude of the average drag force ?dragFdrag exerted on the car?