Current Attempt in Progress 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 459-mile trip in a typical midsize car produces about 4.43 x 10' J of energy. How fast would a 10.7-kg flywheel with a radius of 0.228 m have to rotate to store this much energy? Give your answer in rev/min. Number i eTextbook and Media Save for Later ว Units Attempts: 0 of 3 used Submit Answer APR 2 tv♫ I ZA A& ≈2 80 F4 F2 F3 #3 MacBook Air F5 C F6 $ 4 % 5 6 & 27 F7 W E R T Y U S D ד || F X C H nd > G H * 00 8 DII F8 F9 9 O Д F10 F11 + O P { [ J K L < > B N M I H command option

Current Attempt in Progress 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 459-mile trip in a typical midsize car produces about 4.43 x 10' J of energy. How fast would a 10.7-kg flywheel with a radius of 0.228 m have to rotate to store this much energy? Give your answer in rev/min. Number i eTextbook and Media Save for Later ว Units Attempts: 0 of 3 used Submit Answer APR 2 tv♫ I ZA A& ≈2 80 F4 F2 F3 #3 MacBook Air F5 C F6 $ 4 % 5 6 & 27 F7 W E R T Y U S D ד || F X C H nd > G H * 00 8 DII F8 F9 9 O Д F10 F11 + O P { [ J K L < > B N M I H command option

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter8: Rotational Equilibrium And Rotational Dynamics

Section: Chapter Questions

Problem 76AP: A light rod of length 2L is free to rotate in a vertical plane about a frictionless pivot through...

See similar textbooks

Similar questions

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 light rod of length 2L is free to rotate in a vertical plane about a frictionless pivot through its center. A particle of mass m1 is attached at one end of the rod, and a mass m2 is at the opposite end, where m1 m2. The system is released from rest in the vertical position shown in Figure P8.84a, and at some later time, the system is rotating in the Position shown in Figure P8.84b. Take the reference point of the gravitational potential energy to be at the pivot, (a) Find an expression for the system's total mechanical energy in the vertical position. (b) Find an expression for the total mechanical energy in the rotated position shown in Figure P8.84b. (c) Using the fact that the mechanical energy of the system is conserved, how would you determine the angular speed co of the system in the rotated position? (d) Find the magnitude of the torque on the system in the vertical position and in the routed position. Is the torque constant? Explain what these results imply regarding the angular momentum of the system, (c) Find an expression for the magnitude of the angular acceleration of the system in the rotated position. Does your result make sense when the rod is horizontal? When it is vertical? Explain. Figure P8.84
The puck in Figure 10.25 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.)
Peter propels a penguin with mass 10.0kg from 2.50m above the ground at an angle 30.0o from the horizontal axis (ground), with an initial speed of 15.0 m/s. Assuming the penguin remains rigid (scared, so assume the particle model!) and ignoring any rotational effects, Using the isolated system model, what is the maximum potential energy of the penguin? a. 1370 Joules b. 1125 Joules c. 245 Joules d. 2250 Joules
A block of m = 12 kg is placed against the vertical front of a cart as shown below. What acceleration must the cart have so that block A does not fall? The coefficient of static friction between the block and the are is m, = 0.4. a. 24.5 m/s2 O b. none of these О с. 36.8 m/s? O d. 6.1 m/s? О е. 18.4 m/s?
Computation. The figure shows two blocks, released from rest, connected by a light string passing without slipping over a pulley with moment of inertia 0.032 kg-m² and radius 0.1 m. The coefficient of kinetic friction between the block and the table is 0.38. Using energy methods, find the blocks' speed after they have moved 0.22 m if M = 5.2 kg and m = 7.3 kg. V= M 11 m/s m Record your numerical answer below, assuming three significant figures. Remember to include a as necessary. 31 6:37 P
Any time a cyclist stops, it will take energy to get moving again. Using less energy to get going means more energy is available to go farther or go faster, so racing cyclists want their bikes to be as light as possible. It’s particularly important to have lightweight wheels, as this example will show. Consider two bikes that have the same total mass but different mass wheels. Bike 1 has a 10.0 kg frame and two 1.00 kg wheels; bike 2 has a 9.00 kg frame and two 1.50 kg wheels. Both bikes thus have the same 12.0 kg total mass. What is the kinetic energy of each bike when they are moving at 12.0 m/s? Most of the weight of the tire and wheel is at the rim, so we can model each wheel as a hoop.
%W li. In. D 回1:rY د امتحان يومي -شعبة GROUP- A QUIZ: A force P passing through points A and B in the figure below has a clockwise moment of 300 ft.Ib about O. Determine the value of P. A II
4. Two wheels (A and B) of equal mass and the same Iz roll down a hill without sliding and have the same kinetic energy. Partway down the hill, wheel B stops rolling and continues down the hill sliding (no rotation), but maintains the same kinetic energy as wheel A which continues to roll without sliding. Which wheel reaches the base of the hill first (assuming they travel the same path length)? wheel A (the one that rolls the whole way) wheel B (the one that starts sliding) they reach the hill base at the same time
1. Suppose a cart with four wheels and a disk whose mass is equal to the totalmass of the cart roll down the ramp. Which, if either, has more gravitationalpotential energy at the top? 2. Which of those objects has more kinetic energy at the bottom? Why? 3. Imagine the disk just spinning in place instead of rolling. Would it have kineticenergy? Why? 4. Why does the cart have more speed at the bottom even though it doesn’t havemore kinetic energy than the disk?
A grinding wheel 0.2 m in diameter, of mass 3 kg, is rotating at 3600 revolution per minute about an axis through its center. What is its kinetic energy?
q1) We can use rotating cylinder to store energy in space. Let a 10-meter-long cylinder with diameter 1.0 m has mass 60000 kg. Estimate the kinetic energy it can store when it is rotating in an angular speed 50 rad/s