3-7. A mass of 25 kg is suspended by a light string from a pulley of radius 0.25 m inertia 0.8 kg m². The pulley turns on bearing of negligible friction. 3. When the mass descends 2 m, the pulley turns through 458. 2/157 = 1.2732-360= Circz 1.5707 4. When the mass descends 2 m, the potential energy of the mass decreased by 500. 25-10-2=gh 5. The change in kinetic energy of the mass and pulley when the mass descends 2 m Ima kt 6. The angular acceleration of the pulley is mg-T=ma 16.4 7. When the mass descends 2 m, the kinetic pulley changes by

3-7. A mass of 25 kg is suspended by a light string from a pulley of radius 0.25 m inertia 0.8 kg m². The pulley turns on bearing of negligible friction. 3. When the mass descends 2 m, the pulley turns through 458. 2/157 = 1.2732-360= Circz 1.5707 4. When the mass descends 2 m, the potential energy of the mass decreased by 500. 25-10-2=gh 5. The change in kinetic energy of the mass and pulley when the mass descends 2 m Ima kt 6. The angular acceleration of the pulley is mg-T=ma 16.4 7. When the mass descends 2 m, the kinetic pulley changes by

Name: 5,6 and 7 please 3-7. A mass of 25 kg is suspended by a light string f
Uploaded: 2024-03-20T06:57:25.000Z
Channel: Bartleby
Description: 5,6 and 7 please 3-7. A mass of 25 kg is suspended by a light string from a pulley of radius 0.25 m and a moment ofinertia 0.8 kg m². The pulley turns on bearing of negligible friction.3. When the mass descends 2 m, the pulley turns through 458.2/157

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter5: Energy

Section: Chapter Questions

Problem 84AP: A cat plays with a toy mouse suspended from a light string of length 1.25 m, rapidly batting the...

See similar textbooks

Similar questions

A cat plays with a toy mouse suspended from a light string of length 1.25 m, rapidly batting the mouse so that it acquires a speed of 2.75 m/s while the string is still vertical. Use energy conservation to find the mouses maximum height above its original position. (Assume the string always remains taut.)
Jane, whose mass is 50.0 kg, needs to swing across a river (having width D) filled with person-eating crocodiles to save Tarzan from danger. She must swing into a wind exerting constant horizontal force F, on a vine having length L and initially making an angle with the vertical (Fig. P7.81). Take D = 50.0 m, F = 110 N, L = 40.0 m, and = 50.0. (a) With what minimum speed must Jane begin her swing to just make it to the other side? (b) Once the rescue is complete, Tarzan and Jane must swing back across the river. With what minimum speed must they begin their swing? Assume Tarzan has a mass of 80.0 kg.
When an automobile moves with constant speed down a highway. most of the power developed by the engine is used to compensate for the energy transformations due to friction forces exerted on the car by the air and the road. If the power developed by an engine is 175 hp, estimate the total friction force acting on the car when it is moving at a speed of 29 m/s. One hone-power equals 746 W.
A block is connected to a spring that is suspended from the ceiling. Assuming air resistance is ignored, describe the energy transformations that occur within die system consisting of the block, the Earth, and the spring when the block is set into vertical motion.
A small block of mass m = 200 g is released from rest at point along the horizontal diameter on the inside of a frictionless, hemispherical bowl of radius R = 30.0 cm (Fig. P7.45). Calculate (a) the gravitational potential energy of the block-Earth system when the block is at point relative to point . (b) the kinetic energy of the block at point , (c) its speed at point , and (d) its kinetic energy and the potential energy when the block is at point . Figure P7.45 Problems 45 and 46.
. A particular hydraulic pile driver uses a ram with a mass of 1040 kg. If the maximum pile energy is 11,780J, how high must the ram he raised to achieve this value? Assuming it takes 0.62 s for the pile driver’s winch motor to raise the ram at a constant speed to this height, what is the power output by the motor in completing this task? Express your answer in both watts and horsepower.
A 3.50-kN piano is lilted by three workers at constant speed to an apartment 25.0 m above the street using a pulley system fastened to the roof of the building. Each worker is able to deliver 165 W of power, and the pulley system is 75% efficient (so that 25% of the mechanical energy is lost due to friction in the pulley). Neglecting the mass of the pulley, find the time required to lift the piano from the street to the apartment.
A 500-kg dragster accelerates from rest to a final speed of 110 m/s in 400 m (about a quarter of a mile) and encounters an average frictional force of 1200 N. What is its average power output in watts and horsepower if this takes 7.30 s?
A 3.50-kN piano is lilted by three workers at constant speed to an apartment 25.0 m above the street using a pulley system fastened to the roof of the building. Each worker is able to deliver 165 W of power, and the pulley system is 75% efficient (so that 25% of the mechanical energy is lost due to friction in the pulley). Neglecting the mass of the pulley, find the time required to lift the piano from the street to the apartment.
A fellow student tells you that she has both zero kinetic energy and zero potential energy. Is this possible? Explain.
An external force acts on a particle during a trip from one point to another and back to that same point. This particle is only effected by conservative forces. Does this particle’s kinetic energy and potential change as a result of this trip?
A pendulum, comprising a light string of length L and a small sphere, swings in the vertical plane. The string hits a peg located a distance d below the point of suspension (Fig. P7.80). (a) Show that if the sphere is released from a height below that of the peg, it will return to this height after the string strikes the peg. (b) Show that if the pendulum is released from rest at the horizontal position ( = 90) and is to swing in a complete circle centered on the peg, the minimum value of d must be 3L/5. Figure P7.80