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A uniform disc of radius 30 cm and mass 12 kg is pivoted so that it is free to rotate about an axis through its center. A string wrapped around the disc is pulled with a force of 80 N. What is the angular velocity of the disc after 5 s?
Compute the average force the beam exerts on the pile driver while the pile driver is brought to rest
During a heavy rain, the drops are falling at a constant velocity and at an angle of 9.5° west of the vertical. What is your walking speed if the speed of the drops relative to the ground is 4.6 m/s
The automobile afterwards undergoes a uniform acceleration of -4 m/s2 because of a red light and comes to rest. It remains at rest for 54.6s and next accelerates back to a speed of 25.6m/s at a rate of 2.85m/s2.
A certain lightbulb has a tungsten filament with a resistance of 18.9 ? when at 20.0°C and 139 ? when hot. Find the temperature of the hot filament
A wheel rotates about a fixed axis with an initial angular velocity of 25 rad/s. During a 4.0-s interval the angular velocity decreases to 10 rad/s. How many radians does the wheel turn
An ideal gas in a piston is placed in a refrigerator, which removes 686 J of energy from the gas via cooling. find the net change in the internal energy of the gas in the piston
in a Tom's double-slit experiment using 549nm light, a thin piece of plexiglass of refractive index 1.53 covers one of the slits. what is the minimum thickness of the plexiglass
A block is released from rest on an inclined plane and moves 3.1 m during the next 3.9 s. What is the coefficient of kinetic friction k for the incline
Rocky's base metabolic rate is 100 W (when not exercising). He weighs 80 kg. This morning, he climbed stairs 25-cm high at the rate of 140 steps per minute for 30 minutes on a Stairmaster. How much energy did he burn (in J and in kWh)
A wire of length L is wound into a square coil with 127 turns and used in a generator that operates at 60.0 Hz, What is the length Lof the wire used to construct the coil
A 4.5×106kg spaceship moves away from Earth with a speed of 0.78c. What is the magnitude of the ship's relativistic momentum
A 7700-kg boxcar traveling 18m/s strikes a second car. The two stick together and move off with a speed of 5.0m/s. What is the mass of the second car
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