A smooth circular hoop with a radius of 0.900 m is placed flat on the floor. A 0.475-kg particle slides around the inside edge of the hoop. The particle is given an initial speed of 9.00 m/s. After one revolution, its speed has dropped to 5.00 m/s because of friction with the floor. (a) Find the energy transformed from mechanical to internal in the particle-hoop-floor system as a result of friction in one revolution. 13.3 (b) What is the total number of revolutions the particle makes before stopping? Assume the friction force remains constant during the entire motion. Your response differs from the correct answer by more than 10%. Double check your calculations. rev

12:45 1 4) A roller coaster of mass 80.0 kg is moving with a speed of 20.0 m/s at position A as shown in the figure. The vertical height above ground level at position A is 200 m. Neglect friction. 200 m 160 m -- Potential Energy 0 A.What is the total mechanical energy of the roller coaster at point A? B. What is the total mechanical energy of the roller coaster at point B? C. What is the speed of the roller coaster at point B? Explain your D. What is the speed of the roller coaster at point C? answer

Current Attempt in Progress A 49.4-g golf ball is driven from the tee with an initial speed of 56.1 m/s and rises to a height of 20.0 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. (b) What is its speed when it is 8.14 m below its highest point? (a) Number i (b) Number i Units Units ◆

A crane at a construction site lifts a concrete block with a mass of m = 482 kg from the ground to the top of a building with a height of h = 23.9 m. How much work did the motor of the crane do? (Assume zero energy loss in the lifting mechanism due to friction.) -112894 J moter If the duration of the lift was 1.35 minutes, then what was the average power performed by the crane?

In the figure, a 2.8 kg block is accelerated from rest by a compressed spring of spring constant 620 N/m. The block leaves the spring at the spring's relaxed length and then travels over a horizontal floor with a coefficient of kinetic friction -0.241. The frictional force stops the block in distance D-8.2 m. What are (a) the increase in the thermal energy of the block-floor system, (b) the maximum kinetic energy of the block, and (c) the original compression distance of the spring? No friction

This time, the pendulum is 1.07 m long and has a mass of 3.19 kg. You give it a push away from vertical so that it starts swinging with a speed of 1.02 m/s. Due to friction at the pivot point, 1.00 Joule of the pendulum s initial kinetic energy is lost as heat during the upward swing. What maximum angle will it reach, with respect to the vertical, before falling back down?     18.1 degrees     20.5 degrees     19.3 degrees     11.4 degrees

A 5 kg object is fired straight up with an initial speed of 100 m/s. Ignore air resistance and set the initial height of the object at zero. Use g = 10m/s/s.   Find the total energy of the object. Find the height of the object when its speed is 50 m/s. Find the speed of the object when its height is 80 m. Find the maximum height of the object.   A child and sled have a combined mass of 50 kg. The child starts sliding from rest at the top of a 10 m high hill. On the way down, friction reduces the total energy by 3000 J. What is the child's speed at the bottom of the hill?

In the figure, a 2.9 kg block is accelerated from rest by a compressed spring of spring constant 650 N/m. The block leaves the spring at the spring's relaxed length and then travels over a horizontal floor with a coefficient of kinetic friction k = 0.210. The frictional force stops the block in distance D = 7.5 m. What are (a) the increase in the thermal energy of the block-floor system, (b) the maximum kinetic energy of the block, and (c) the original compression distance of the spring? (a) Number (b) Number (c) Number XXX Units Units Units No friction D