The 1.0 kg block in the figure is tied to the wall with a rope. It sits on top of the 2.0 kg block. The lower block is pulled to the right with a tension force of 20 N. The coefficient of kinetic friction at both the lower and upper surfaces of the 2.0 kg block is = 0.450.

Rod OA rotates counterclockwise with a constant angular velocity of 5 rad/s. The double collar B is pin-connected together such that one collar slides over the rotating rod and the other slides over the horizontal curved rod, of which the shape is described by the equation r = 1.5(2 - cosq) ft. If both collars weight 0.75 lb, determine the normal force which the curved rod exerts on one collar at the instant = 120o. Neglect friction.

A car of mass accelerates from speed to speed while going up a slope that makes an angle with the horizontal. The coefficient of static friction is , and the acceleration due to gravity is . Find the total work done on the car by the external forces.

The deuterium nucleus starts out with a kinetic energy of 8.4e-14 joules, and the proton starts out with a kinetic energy of 1.67e-13 joules. The radius of a proton is 0.9e-15 m; assume that if the particles touch, the distance between their centers will be twice that. What will be the total kinetic energy of both particles an instant before they touch?

A man takes his dog out for a walk. The dog has no legs and is dragged along the sidewalk on a little sled (mass of dog + sled = 13.0kg). The sidewalk exerts a frictional force of 14.0N. If the man pulls the leash at an angle of 55 degrees and the dog moves at constant velocity, what is the coefficient of friction between the sled and side walk?

the mass of the crate in the figure above is 32 kg and the coefficient of kinetic friction with the floor is 0.45. if john pushes with a force F of 220 N at an angle of 21 degrees below the horizontal, then what is the acceleration of the crate

An electron is accelerated through an electric potential to a kinetic energy of 18.4 keV. What is its characteristic wavelength? [Hint: Recall that the kinetic energy of a moving object is E=1/2mv^2, where m is the mass of the object and v is the speed of the object.]

An automobile with a mass of 940 kg goes around a curve with a radius of 64m.The coefficient of friction between the tires and the road is 0.700. What is the maximum speed with which the car can go around the curve ?

A car of mass m moving at a speed v1 collides and couples with the back of a truck of mass 3m moving initially in the same direction as the car at a lower speed v2. (Use the following variables as necessary: m, v_1 for v1, and v_2 for v2.) What is the change in kinetic energy of the car truck system in the collision?

You are a member of an alpine rescue team and must project a box of supplies, with mass , up an incline of constant slope angle so that it reaches a stranded skier who is a vertical distance above the bottom of the incline. The incline is slippery, but there is some friction present, with kinetic friction coefficient .

In the figure below, two blocks, of mass m1 = 350 g and m2 = 710 g, are connected by a massless cord that is wrapped around a uniform disk of mass M = 500 g and radius R = 12.0 cm. The disk can rotate without friction about a fixed horizontal axis through its center; the cord cannot slip on the disk. The system is released from rest.

A 13.3 kg crate is pulled by a 181 N force (parallel to the incline) up a rough incline. Assume that the incline makes an angle of 31.8 with the horizontal and that the coefficient of kinetic friction is 0.436. The crate has an initial speed of 1.60 m/s. It is pulled a distance of 5.90 m. What is the change in mechanical energy of the crate? Answer in units of J and use 9.8 m/s2 for g.

A 5.0--long ladder has mass 11.0 and is leaning against a frictionless wall, making a 66 angle with the horizontal. If the coefficient of friction between the ladder and ground is 0.42, what is the mass of the heaviest person who can safely ascend to the top of the ladder? (The center of mass of the ladder is at its center.)

A 8.0 bullet is fired into a 8.0 wood block that is at rest on a wood table. The block, with the bullet embedded, slides 5.0 across the table. The coefficient of kinetic friction for wood sliding on wood is 0.20. What was the speed of the bullet?

Megan's mass is 30 kg. She climbs the 4.8 m ladder of a slide and reaches a velocity of 2.8 m/s at the bottom of the slide. How much work was done by friction on Megan? Assume that air resistance is negligible.

A m1 = 15.0 kg object and a m2 = 12.0 kg object are suspended, joined by a cord that passes over a pulley with a radius of 10.0 cm and a mass of 3.00 kg (Fig. P10.46). The cord has a negligible mass and does not slip on the pulley. The pulley rotates on its axis without friction. The objects start from rest 3.00 m apart.

A 2100 kg car traveling to the right at 22 m/s is chasing a second car of the same mass that is traveling to the right at 10 m/s. What fraction of the initial kinetic energy of the cars is lost during this collision?

28-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 170 J from 470 J. How high does she rise during this interval? Neglect air resistance