The puck in the figure below has a mass of 0.120 kg. The distance of the puck from the center of rotation is originally 39.0 cm, and the puck is sliding with a speed of 80.0 cm/s. The string is pulled downward 18.0 cm through the hole in the frictionless table Determine the work done on the puck. (Suggestion: Consider the change of kinetic energy.)

The puck in the figure below has a mass of 0.120 kg. The distance of the puck from the center of rotation is originally 39.0 cm, and the puck is sliding with a speed of 80.0 cm/s. The string is pulled downward 18.0 cm through the hole in the frictionless table Determine the work done on the puck. (Suggestion: Consider the change of kinetic energy.)

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter10: Rotational Motion

Section: Chapter Questions

Problem 55P: The puck in Figure 10.25 has a mass of 0.120 kg. The distance of the puck from the center of...

See similar textbooks

Similar questions

The puck in Figure P11.46 has a mass of 0.120 kg. The distance of the puck from the center of rotation is originally 40.0 cm, and the puck is sliding with a speed of 80.0 cm/s. The string is pulled downward 15.0 cm through the hole in the frictionless table. Determine the work done on the puck. (Suggestion: Consider the change of kinetic energy.) Figure P11.46
To develop muscle tone, a woman lifts a 2.00-kg weight held in her hand. She uses her biceps muscle to flex the lower arm through an angle of 60.0°. (a) What is the angular acceleration if the weight is 24.0 cm from the elbow joint, her forearm has a moment of inertia of 0.250kg-m2 and the net force she exerts is 750 N at an effective perpendicular lever arm of 2.00 cm? (b) How much work does she do?
An athlete in a gym applies a constant force of 50 N to the pedals of a bicycle to keep the rotation rate of the wheel at 10 rev/s. The length of the pedal arms is 30 cm. What is the power delivered to the bicycle by the athlete?
Consider two objects with m1 m2 connected by a light string that passes over a pulley having a moment of inertia of I about its axis of rotation as shown in Figure P10.44. The string does not slip on the pulley or stretch. The pulley turns without friction. The two objects are released from rest separated by a vertical distance 2h. (a) Use the principle of conservation of energy to find the translational speeds of the objects as they pass each other. (b) Find the angular speed of the pulley at this time.
Sophia is playing with a set of wooden toys, rolling them offthe table and onto the floor. One of the toys is a small spherewith a mass of 0.024 kg and a radius of 0.020 m, and another isa small cylinder that also has a mass of 0.024 kg but a radius of0.013 m. She rolls each toy so that it has the same translationalspeed of 0.40 m/s. How much greater is the kinetic energy ofthe cylinder than the kinetic energy of the sphere?
The mass of a hoop of radius 1.0 m is 6.0 kg. It rolls across a horizontal surface with a speed of 10.0 m/s. (a) How much work is required to stop the hoop? (b) If the hoop starts up a surface at 30 to the horizontal with a speed of 10.0 m/s, how far along the incline will it travel before stopping and rolling back down?
A giant swing at an amusement park consists of a 365-kg uniform arm 10.0 m long, with two seats of negligible mass connected at the lower end of the arm (Fig. P8.53). (a) How far from the upper end is the center of mass of the arm? (b) The gravitational potential energy of the arm is the same as if all its mass were concentrated at the center of mass. If the arm is raised through a 45.0 angle, find the gravitational potential energy, where the zero level is taken to be 10.0 m below the axis, (c) The arm drops from rest from the position described in part (b). Find the gravitational potential energy of the system when it reaches the vertical orientation. (d) Find the speed of the seats at the bottom of the swing.
A lawnmower engine brings a 1 m-long by 0.1 m-wide cutting blade of mass 2.55 kg from rest to an angular speed of 1800 rpm in 1.27 seconds. What is the average power supplied by the engine during this period? 2910 W 2940 W 2970 W 3000 W 3030 W
An airplane propeller consists if three radial blades, each of length 1.9 m and a mass 5.1 kg. What is the kinetic energy of this propeller when rotating at 2200 rev/min? Assume that each blade is (approximately) a uniform rod.
A torque of 170 N.m does 3420 J of work on a rotating flywheel. If the flywheels initial kinetic energy is 1266 J, what is its final kinetic energy? Report your answer in 4 significant figures
To develop muscle tone, a woman lifts a 2.00-kg weight held in her hand. She uses her biceps muscle to flex the lower arm through an angle of 60.0. (a) What is the angular acceleration if the weight is 24.0 cm from the elbow joint, her forearm has a moment of inertia of 0.0250 kg.m, and the net force she exerts is 750 N at an effective perpendicular lever arm of 2.00 cm? (b) Howmuch work does she do?
Trucks can be run on energy stored in a rotating flywheel, with an electric motor getting the flywheel up to its top speed of 683 rad/s. One such flywheel is a solid, uniform cylinder with a mass of 535 kg and a radius of 1.2 m that rotates about its central axis. What is the kinetic energy of the flywheel after charging? If the truck uses an average power of 8.4 kW, for how many minutes can it operate between chargings?