A 13,129-lb truck enters an emergency exit ramp at a speed of 112.4 ft/s. It travels for 7.9 s before its speed is reduced to 24.5 ft/s. Determine the braking force by the truck if the acceleration is constant. (Use Impulse-Momentum concepts.)

6. A 10 kg crate slides 1 meter down a 30 degree ramp where it comes in contact with a spring. The spring has a stiffness of k = 600 N/m and an un-stretched length of so = 1 m. The crate has a coefficient of kinetic friction with the surface of µk = 0.25. If the spring compresses 0.75 m after contact when the block stops, determine the initial velocity, vo, of the block. VO Spring So mounnu 30°

A 0.30 kg softball has a velocity of 12 m/s at an angle of 28° below the horizontal just before making contact with the bat. What is the magnitude of the change in momentum of the ball while in contact with the bat if the ball leaves with a velocity of 15 m/s horizontally back toward the pitcher? 4.2 kg.m/s 8.6 kg.m/s 7.9 kg-m/s 5.7 kg-m/s 3.3 kg-m/s

A cart is loaded with a brick and pulled at constant speed along an inclined plane to the height of a seat-top. If the mass of the loaded cart is 3.0 kg and the height of the seat top is 0.45 meters, then what is the potential energy of the loaded cart at the height of the seat-top? A If a force of 14.7 N is used to drag the loaded cart (from previous question) along the incline for a distance of 0.90 meters, then how much work is done on the loaded cart?

A car with a mass of 1100 kg traveling at 50 km/hr locks up its brakes, stopping over a distance of 18 meters. If the same car were to lock up its brakes when traveling 80 km/hr how far would you expect the car to slide before coming to a stop? (Hint: assume the same friction force in both cases)

5. A 2-kg sphere is attached to a massless rigid rod attached to a fixed pivot point O. The rigid rod and mass rotate in the horizontal plane. A moment is applied to the rod of magnitude M = 0.5t² N. m, where t is in seconds. The length of the rod is 0.5 m. Determine the speed of the sphere after the moment is applied for 5 seconds. M(t)

Two cars A and B, each having a mass of 1.6 Mg, collide on the icy pavement of an intersection. The direction of motion of each car after collision is measured from snow tracks as shown in (Figure 1). Assume 0 = 40°. The driver in car A states that he was going 60 km/h just before collision and that after collision he applied the brakes, so that his car skidded 4 m before stopping. Assume that the coefficient of kinetic friction between the car wheels and the pavement is μ = 0.15. Figure A B B 1 of 1 Part A Determine the approximate speed of car B just before collision. Note: The line of impact has not been defined; furthermore, this information is not needed for solution. Express your answer to three significant figures and include the appropriate units. VB = Submit Value Provide Feedback Request Answer Units Review ? Next

The figure depicts two pucks on a frictionless table. Puck 2 is four times as massive as puck 1. Starting from rest, the pucks are pushed by two equal forces. 1-Which pucks will have the grater kinetic energy upon reaching the finish line? 2- Which puck will reach the finish time first ?

Collision at an Angle To apply conservation of linear momentum in an inelastic collision.  Two cars, both of mass m, collide and stick together. Prior to the collision, one car had been traveling north at a speed 2v, while the second was traveling in a southeastern direction at an angle ϕ with respect to the east-west direction and at a speed v. After the collision, the two-car system travels in a northeastern direction at an angle θ with respect to the north-south direction and at a speed v final.   Find v final, the speed of the joined cars after the collision. Express your answer in terms of v and ϕ.

A cargo truck weighing 2,700 kg accelerates from 3.5 m / s to 6.2 m / s in 12.0 seconds applying a constant force. What change does the momentum experience? b. What is the intensity of the force exerted?