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A person with mass mp = 77 kg stands on a spinning platform disk with a radius of R = 2.16 m and mass md = 185 kg. The disk is initially spinning at ? = 1.6 rad/s. The person then walks 2/3 of the way toward the center of the disk (ending 0.72 m from the center).1. What is the change in the total kinetic energy of the person and disk? (A positive value means the energy increased.)2. If the person now walks back to the rim of the disk, what is the final angular speed of the disk?
A particle whose mass is 2 kg moves in the xy plane with a constant speed of 3 m/s in the x direction along the line y = 5. What is its angular momentum (in kg×m2/s) relative to the origin
What mass of water at 29.0°C added to a Styrofoam cup containing two 60.0 g ice cubes from a freezer at -16.0°C will result in a final temperature of 5.00°C for the drink? Explain it.
A 150 g mass hangs from a fishing line. If it falls and accelerates at 4.0 m/s^2, what is the tension in the fishing line
A 700 kg piston is initially held in place by a removable latch above a vertical cylinder. The cylinder has an area of 0.1 m^2; the volume of the gas within the cylinder is initially 0.1 m^3 at a pressure of 10 bar.
The magnetic field has been measured to be horizontal everywhere along a rectangular path x = 22 cm long and y = 5 cm high. Along the bottom the average magnetic field B1 = 1.3 10-4 tesla, along the sides an average magnetic field B2 = 1.0 10-4 te..
a force of magnitude 7.50 N pushes three boxes with masses m1 = 1.30 kg, m2 = 2.80 kg, and m3 = 5.30 kg. Find the magnitude of the contact force between boxes 1 and 2
In the troposphere, the part of the atmosphere that extends from the surface to an altitude of about 11 km, calculate the pressure p at height y=8863m
A puck (mass m1 = 1.30 kg) slides on a frictionless table as shown in the figure below. The puck is tied to a string that runs through a hole in the table and is attached to a mass m2 = 3.9 kg. What is the change in the kinetic energy of the puck
An isolated copper sphere of radius 3.00cm, initially uncharged, is illuminated with ultraviolet light of wavelength 180nm. what charge does the photoelectric effect induce on the sphere
A 0.17- kg block on a wooden table is given a sharp blow with a hammer. The block then slides across the table to a stop. The coefficient of friction between the block and table is 0.25. How far does the block go
How long would it take for an object dropped from the Leaning Tower of Pisa (height 54.6 meters) to hit the ground, and how fast was the object traveling at the moment of impact
A 10 kg dog is standing on scale in an accelerating elevator. If the scale reads 5 kg, what is the acceleration of the elevator
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