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A uniform circular disk (merry-go-round) of radius R=1.76 m and mass M=28.4 kg freely rotates about a vertical axis, which is perpendicular to the ground, with initial angular velocity omegai=2.35 rad/s. A cat of mass m=7.90 kg, climbing in a tree, which hangs over the disk, falls straight down onto the edge of the disk and rides on it. What is the magnitude of the angular velocity of the cat/disk system after the cat has landed?
A uniform electric field of magnitude 415 N/C pointing in the positive x-direction acts on an electron, which is initially at rest. The electron has moved 3.00 cm. What is the work done by the field on the electron
If a capacitor has opposite 5.3?C charges on the plates, and an electric field of 2.4kV/mm is desired between the plates, what must each plate's area be
A toy car is driven by a battery of 9V. it draws a current of 2mA. what is the resistance of the car
Light is reflected from a glass coffee table. When the angle of incidence is 50.0°, What is the index of refraction of the glass
A spherical mirror has a focal length of +10cm. Find the location and then describe the miage for an object for an object distance of 25cm. How fast does the image of the object move
What is the magnitude of vertical component of its velocity as it strikes the ground.
A picture shows a charge A 1.00 m above the origin and has a charge of 5.00 X10^-9, Find the magnitude and direction of the electrostatic force on charge B.
A potter's wheel having a radius 0.450m and a moment of inertia 15 kg•m2 is rotating freely at 45 rev/min. The potter can stop the wheel in 7.50 s by pressing a wet rag against the rim and exerting a radically inward force of 68 N.
An astronaut's normal weight it 600 newtons. How much would she weigh while orbiting in a satellite at 12,000 kilometers [two earth radii] above the surface of Earth.
In adding, the snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57 N. Find out the acceleration of the sled and child.
In the hydraulic system shown in the figure , the piston on the left has a diameter of 4.5 and a mass of 1.8, what is the height difference between the two pistons
A simple pendulum consists of a ball connected to one end of a thin brass wire. find the change in the period of the heated pendulum
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