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A disk, with a radius of 0.25 m, is to be rotated like a merry-go-round through 1000 rad, starting from rest, gaining angular speed at the constant rate ?1 through the first 500 rad and then losing angular speed at the constant rate -?1 until it is again at rest. The magnitude of the centripetal acceleration of any portion of the disk is not to exceed 100 m/s2. (a) What is the least time required for the rotation? (b) What is the corresponding value of ?1?
A 2,200-kg car moving east at 10.0 m/s collides with a 3,000-kg car moving north. The cars stick together and move as a unit after the collision, Find the speed of the 3,000-kg car before the collision
A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. find the tension in the tightrope
Find the kinetic energy of a 81.0-kg spacecraft launched out of the solar system with speed 146 km/s by using the classical equation K =(1/2)mu^2
A +5.8 µC charge is placed at the origin and a -3.9 µC charge is placed at x = 25 cm. At what coordinates can a third charge be placed
A street light is supported by two wires and each makes a different angle from each other. Find the tension in each wire if the street light has a mass of 60.0 kg
A dentist uses a mirror to examine a tooth that is 0.75 cm in front of the mirror. The image of the tooth is formed 14.0 cm behind the mirror. Determine the magnification of the image
An 845-N sled is pulled a distance of 186m. The task requires 1.2 multiplied by 104 J of work and is done by pulling on a rope with a force of 133-N. At what angle is the rope held.
A clothes dryer runs on 4400 W. If the dryer draws 20 A of current, what is the resistance of the dryer
A proton initially at rest is accelerated by a uniform electric field. The proton moves 6.48 cm in 1.20 10-6 s. Find the voltage drop through which the proton moves
a 150 gm ice cube at 0.0 celcius is dropped into an insulated cup with 200 gm of water at 15 celcius. describe the final mixture after equilibrium has been reached
A hollow cylinder (hoop) is rolling on a horizontal surface at speed v=3.0 m/s when it reaches a 15 degree incline. How far up the incline will it go
A 4.4-g bullet leaves the muzzle of a rifle with a speed of 314 m/s. What force (assumed constant) is exerted on the bullet
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