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A uniform 2.15- kg spinning disk with a radius of 0.233 m is brought to rest by a brake-pad pressed against the side 0.149 m from the rotation axis. The wheel is brought to rest from an angular velocity of 17.3 rad/s in a time of 20.5 s. What frictional force was applied by the brake pad?
A 1,000-W motor powers a hoist used to lift cars at a service station. If the original motor is replaced with one rated at 2,000 W, how long would it take to complete this task
With what velocity would they be separating after the collision.
A crate of 45.2-kg tools rests on a horizontal floor. You exert a gradually increasing horizontal push on it and observe that the crate just begins to move when your force exceeds 310N. find the coefficient of static friction between the crate and ..
X rays diffract from a crystal in which the spacing between atomic planes is 0.179nm. What is the angle of the first-order diffraction
According to Equation 20.7, an ac voltage V is given as a function of time t by V = Vo sin 2ft, what is the smallest value of the time at which the voltage equals one-half of the peak-value
A solid, uniform sphere of mass 2.0 kg and radius 1.7 m starts from rest and rolls without slipping down an inclined plane of height 5 m. What is the angular velocity of the sphere
Your friend's car is parked on a cliff overlooking the ocean on an incline that makes an angle of 22.1° below the horizontal. Find the car's position relative to the base of the cliff
Barometric pressure in the eye of a hurricane is 0.91atm (27.2 in of mercury). How does the level of the ocean surface under the eye compare with the level under the distant fair-weather region where the pressure is 1.0atm.
The quantity of charge q (in coulombs) that has passed through a surface of area 1.90 cm2 varies with time according to the equation q = 8t3 + 8t + 6, What is the value of the current density
A certain kind of glass has an index of refraction of 1.660 for blue light of wavelength 420 nm and an index of 1.630 for red light of wavelength 690 nm. what is the angle between the two beams inside the glass
A telephoto camera lens system needs to be able to form reasonably sized images of distant objects, Find the height of the final image formed by the two lenses. Is it upright or inverted
The Stanford Linear Accelerator (SLAC) is an electron accelator that provides an oscillating \radio-frequency" (RF) electric field in the form of a wave that stays in synchronism with the electrons being accelerated.
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