A 52 kg hoop of radius 1.7 m, initially rotating at 208 revolutions per minute, is brought smoothly to a stop in 14 s. What is the average power (in Watts) associated with the force that brings the hoop to a stop?
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A: A.)f=ma=f=kx add both masses=5.4kg f=5.4×9.81= 52.97N 52.97=86x therefore, x=.6159m…
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- The puck in the figure below has a mass of 0.224 kg. Its original distance from the center of rotation is 40.0 cm, and it moves with a speed of 70.0 cm/s. The string is pulled downward 15.0 cm through the hole in the frictionless table. Determine the work done on the puck. Hint: Consider the change in kinetic energy of the puck. J m PA 34.0 kg wheel, essentially a thin hoop with radius 1.60 m, is rotating at 111 rev/min. It must be brought to a stop in 28.0 s. (a) How much work must be done to stop it? (b) What is the required average power? Give absolute values for both parts.While spinning down from 500.0 rpm to rest, a solid uniform disk does 51 KJ of work. If the radius of the disk is r=400mm what is it's mass?.
- A hollow sphere is released from rest at the top of the ramp at the height of 0.21 m. The hollow sphere rolls down the ramp (height at the bottom is 0.05m) to a distance of 1.00 m in 1.192 seconds. The angle of the incline is 15 degrees. There is only potential energy at the top and only Kinetic energy at the bottom of the ramp. Please calculate the linear speed at the bottom of the ramp. Assume that the acceleration is not 9.8 m/s2. Find the value for the height by the difference in height from where the sphere was released to where the bottom is located. Calculate the translation speed of the hollow sphere at the bottom of the ramp using conservation of energy equations.A 85.0 kg hoop rolls along a horizontal floor so that its center of mass has a speed of 0.110 m/s. How much work must be done on the hoop to stop it? Number i 1.03 UnitsA hollow ball has a radius of 2.47cm and a mass of 7kg and is rolling, it is traveling with a translational speed of 8m/s. What is its kinetic energy?
- While spinning down from 95 rads/s to rest, a solid cylinder does 3.7 kJ ofwork.If the radius of the disk is 1.2 m, what is the mass?A flywheel is a solid disk that rotates about an axis that is perpendicular to the disk at its center. Rotating flywheels provide a means for storing energy in the form of rotational kinetic energy and are being considered as a possible alternative to batteries in electric cars. The gasoline burned in a 492-mile trip in a typical midsize car produces about 3.30 x 10° J of energy. How fast would a 26.8-kg flywheel with a radius of 0.315 m have to rotate to store this much energy? Give your answer in rev/min. Number 6640184.43 Units rev/minA 3.4-kg sphere is suspended by a cord that passes over a 1.3-kg pulley of radius 3.6 cm. The cord is attached to a spring whose force constant is k = 86 N/m as in the figure below. Assume the pulley is a solid disk. (a) If the sphere is released from rest with the spring unstretched, what distance does the sphere fall through before stopping? m (b) Find the speed of the sphere after has fallen 25 cm. m/s Need Help? Read It
- A rotating flywheel can be used to store energy. If it is required to store 1.00 × 106J of energy when rotating at, ω, 400 rad/s, what is the moment of inertial of the wheel inkg∙m2?A) 6.25B) 12.5C) 25.0D) 50.0The figure shows a thin rod, of length L = 2.20 m and negligible mass, that can pivot about one end to rotate in a vertical circle. A heavy ball of mass m = 8.10 kg is attached to the other end. The rod is pulled aside to angle 00 = 8° and released with initial velocity V 0. (a) What is the speed of the ball at the lowest point? (b) Does the speed increase, decrease, or remain the same if %3D the mass is increased? 3.A bowling ball of mass 7.26 kg and radius 10.3 cm rolls without slipping down a lane at 3.00 m/s. Calculate its total kinetic energy. Express your answer using three significant figures and include the appropriate units.