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A wheel free to rotate about its axis that is not frictionless is initially at rest. A constant external torque of +60 N·m is applied to the wheel for 18 s, giving the wheel an angular velocity of +570 rev/min. The external torque is then removed, and the wheel comes to rest 120 s later.
(a) Find the moment of inertia of the wheel.
kg·m2
(b) Find the frictional torque, which is assumed to be constant.
N·m
A 2.00×10-2- cube of ice at an initial temperature of -19 is placed in 0.670 of water at 44.0 in an insulated container of negligible mass.
A butterfly moves with a speed of v = 12.0 m/s east of North. The y-component of its velocity is 8.00 m/s. The angle between the direction of its motion and the x-axis.
Two charges q1 = 7 µC, q2 = -33 µC, are L = 14 cm apart. A third charge is to be placed on the line between the two charges. How far from q1 should the third charge be placed so that the net electric force on the third charge is minimized?
Sketch the shear force and bending moment diagram and Verify that the support reactions are correct.
A cell membrane is composed of lipid molecules and approximately 10.48 nm thick. If the dielectric constant of the lipid is k = 5, what is the approximate capacitance of a spherical cell that has a diameter of 10.48 mu m?
A double-slit experiment is set up using red light (l = 714 nm). A first order bright fringe is seen at a given location on a screen. What wavelength of visible light (between 380 nm and 750 nm) would generate a dark fringe at the identical locati..
find the period of this oscillation.
The collar C is moving downward with an acceleration of 1 m/s2. At the instant shown, it has a speed of 2 m/s which gives links CB and AB an angular velocity ωAB = ωCB = 10 rad/s. Determine the angular accelerations of CB and AB at this instant.
What is the coefficient of kinetic friction between the table and floor.
Use the ideal gas approach to find the thermal velocity, and determine the scaling law based on the resulting equation
A box of mass 5.8 kg is accelerated from rest by the force across a floor at a rate of 2.0 m/s2 for 8.2 s. Find the net work done on the box.
A 2.0 mL syringe has an inner diameter of 4.0 mm, the needle inner diameter of 0.21 mm, and a plunger pad diameter (where you place your finger) of 1.20 cm. A nurse uses the syringe to inject medicine into a patient whose blood pressure is 140/100. S..
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