A boat with mass of 5.8 * 10° kg is traveling at 9.1 * 10' m/s. What is the magnitude of the force required to stop the boat if it undergoes a displacement of 7.4 * 10' m? Express your answer in Newtons. Answer:

An object is pushed in x and y directions with the force vector F=-230i+10j (N). The object weighs 20kg and goes through a displacement of r=-2i-5j (m). What would be the final velocity of the object?

A 2000kg truck starts at rest and reaches a speed of 15 m/s over a time period of 5s. What is the value of the force required to do this? Express answer in Newtons.

A freight train consists of two 8.00×104 kg5.60×104 kg engines and 45 cars with average masses of 5.50×104 kg5.50×104 kg. (a) What force must each engine exert backward on the track to accelerate the train at a rate of 4.00×10−2 m/s if the force of friction is 6.20×105 N, assuming the engines exert identical forces? This is not a large frictional force for such a massive system. Rolling friction for trains is small, and consequently trains are very energy-efficient transportation systems. (b) What is the force in the coupling between the 37th and 38th cars (this is the force each exerts on the other), assuming all cars have the same mass and that friction is evenly distributed among all of the cars and engines?

A bowling ball weighing 46.5 N initially moves at a speed of 5.10 m/s. How long must a force of 44.5 N be applied to the ball to stop it?

At Ted's request, Bill pushes the pizza box across the granite countertop towards Ted. When the box leaves Bill's hand it is sliding at 2.60 m/s. The box comes to rest over a distance of 110 cm. What is the coefficient of kinetic friction, uk, between the pizza box and the countertop? (Ignore air drag.)

A boy, with a mass of 48.0 kg, rides a skateboard with a mass of 3.00 kg on a horizontal road. At the top of an incline, his velocity is 1.30 m s. He rides down the incline and reaches the bottom with a velocity of 3.40 m s. The difference in height between the top and the bottom of the incline is 0.540 m. Calculate the average resistive force while the boy rode down the incline. 1.30 m/s तं 3.40 m/s तं 0.540 m 38.0 m

A shopper in a supermarket pushes a loaded cart with a horizontal force of 8 N. The cart has a mass of 26 kg. (a) How far will it move in 7.0 s, starting from rest? (Ignore friction.) m(b) How far will it move in 7.0 s if the shopper places his 30 N child in the cart before he begins to push it?