Physics Laboratory Experiments
8th Edition
ISBN: 9781285738567
Author: Jerry D. Wilson, Cecilia A. Hernández-Hall
Publisher: Cengage Learning
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Chapter 15, Problem 8Q
To determine
Three common applications of wheel and axle.
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In opening a door, a 44.9 N force is applied as shown in the figure below. Find the torque produced by this force with respect to point O. (Let r = 0.700 m and theta = 67.5.)
magnitude =
direction=
clockwise or counterclockwise
List two different wheel and axles in which theforce is applied to the axle. From your observa-tion, estimate which of the two has the greatermechanical advantage
A16-kg block is attached toa cord that is vwrapped around the rim of a flywheel of
diameter 0.40 m and hangs vertically, The rotational inertia of the flywheel is 0.50 kg-
m. When the block is released from rest, the cord unwinds. What is the acceleration
of the block?
013E
C0.15g
0064g
056g
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Physics Laboratory Experiments
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- Two flywheel fo negligible mass and different radii are bounded together and rotate about common axis (see below). The smaller flywheel of radius 30 cm has a cord that has a pulling force of 50 N on it. What pulling force needs to be applied to the cord connecting the larger flywheel of radius 50 cm such that the combination does not rotate?arrow_forwardA cylinder with rotational inertia I1=2.0kgm2 rotates clockwise about a vertical axis through its center with angular speed 1=5.0rad/s . A second cylinder with rotational inertia I2=1.0kgm2 rotates counterclockwise about the same axis with angular speed 2=8.0rad/s . If the cylinders couple so they have the same rotational axis what is the angular speed of the combination? What percentage of the original kinetic energy is lost to friction?arrow_forwardWhat hanging mass must be placed on the cord to keep the pulley from rotating (see the following figure)? The mass on the frictionless plane is 5.0 kg. The inner radius of the pulley is 20 cm and the outer radius is 30 cm.arrow_forward
- A pulley of moment of inertia 2.0kgm2 is mounted on a wall as shown in the following figure. Light strings are wrapped around two circumferences of the pulley and weights are attached. What are (a) the angular acceleration of the pulley and (b) the linear acceleration of the weights? Assume the following data: r1=50cm , r2=20cm , m1=1.0kg , m2=2.0kgarrow_forwardCalculate the rotational kinetic energy of a 12-kg motorcycle wheel if its angular velocity is 120 rad/s and its inner radius is 0.280 m and outer radius 0.330 m.arrow_forwardA turntable (disk) of radius r = 26.0 cm and rotational inertia0.400 kg m2 rotates with an angular speed of 3.00 rad/s arounda frictionless, vertical axle. A wad of clay of mass m =0.250 kg drops onto and sticks to the edge of the turntable.What is the new angular speed of the turntable?arrow_forward
- The figure below shows, at left, a solid wheel of radius R = 0.600 m and mass 75.0 kg. Tu R Mounted directly to it and coaxial with it is a pulley with a much smaller mass and a radius of r = 0.230 m. The wheel and pulley assembly are on a frictionless axle. A belt is wrapped around the pulley and connected to an electric motor as shown on the right. The turning motor gives the wheel and pulley a clockwise angular acceleration of 1.67 rad/s2. The tension T,, in the upper (taut) segment of the belt is 155 N. u (a) What is the tension (in N) in the lower (slack) segment of the belt? N (b) What If? You replace the belt with a different one (one slightly longer and looser, but still tight enough that it does not sag). You again turn on the motor so that the wheel accelerates clockwise. The upper segment of the belt once again has a tension of 155 N, but now the tension in the lower belt is exactly zero. What is the magnitude of the angular acceleration (in rad/s2)? rad/s?arrow_forwardA wheel is delivering 400 W of power at 250 rpm. How much torque is needed to turn the wheel? Don't forget there are 2 pi radians in a rotation! Write your answer to three significant digits and don't forget your units!arrow_forwardA wheel of inner radius r, = 13.4 cm and outer radius r, = 35.0 cm shown in the figure below is free to rotate about the axle through the origin o. What is the magnitude of the net torque on the wheel due to the three forces shown? (Assume F, = 3.40 N, F, = 6.20 N, and F, = 14.2 N.) N- m F, F 45.0°arrow_forward
- A wheel of inner radius r, = 13.4 cm and outer radius r, = 35.0 cm shown in the figure below is free to rotate about the axle through the origin O. What is the magnitude of the net torque on the wheel due to the three forces shown? (Assume F, = 3.40 N, F, = 6.20 N, and F, = 14.2 N.) 0.375 X N.m F, 45.0° F3arrow_forwardPlease asaparrow_forwardIn opening a door, a 49.3 N force is applied as shown in the figure below. Find the torque produced by this force with respect to point O. (Let r = 0.815 m and 0 = 57.5.) Magnitude?arrow_forward
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