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A cord is wrapped around the rim of a wheel 0.310 m in radius, and a steady pull of37.0 N is exerted on the cord. Thewheel is mounted on frictionless bearings on a horizontal shaftthrough its center. The moment of inertia of the wheel about thisshaft is 4.00 kgm2. Compute the angular acceleration of the wheel.
___________rad/s2
A neutron star has a mass of 2.20 × 10^30 kg (about the mass of our sun) and a radius of 5.20 × 10^3 m. Assume an object falls from rest near the surface of such a star. How fast would it be moving after it had fallen a distance of 0.0083 m.
A freezer with a coefficient of performance of 3.53 is used to convert 1.61kg of water to ice in one hour. How much heat is discarded into the room that houses the freezer
Two children hang by their hands from the same tree branch. The branch is straight, and grows out from the tree trunk at an angle of 27.0° above the horizontal. What is the magnitude of the net torque exerted on the branch by the children
A college student is working on her physics homework in her dorm room. Her room contains a total of gas molecules. As she works, her body is converting chemical energy into thermal energy at a rate of 125 . If her dorm room were an isolated system (d..
A 2kg box slides along a frictionless surface with a speed of 15m/s and approaches a horizontal spring with a spring constant of 2000N/m. If one end is fixed, a) How far will the spring compress in stopping the box? b) How far will the spring be comp..
The fundamental frequency of a standing wave on a 1.3-m-long string is 410Hz. What would be the wave speed of a pulse moving along this string
Sodium ions (Na+) move at 0.841 m/s through a bloodstream in the arm of a person standing neara large magnet. what would be the magnetic force on the arm
A 21 kg chimpanzee hangs from the end of a horizontal, broken branch of length L_0 = 1.6 m, What is the shear modulus for this branch
Light traveling in air enters a material at an angle of 25 degrees with respect to the normal. The refracted beam in the material makes an angle of 18 degrees with respect to the normal. Calculate the index of refraction of the material.
A cube of ice is taken from the freezer at -9.2°C and placed in a 98 g aluminum calorimeter filled with 299 g of water at room temperature of 20°C. What was the mass of the ice cube
When the water turns to ice during the night, heat is free into the plants, thereby giving them a measure of protection against the falling temperature. Assume a grower sprays 7.64 kg of water at 0°C onto a fruit tree.
a popgun uses an ideal spring for which k=2000N/m. how high can the gun shoot a 5.0gram projectile
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