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A spinning flywheel has rotational inertia I = 403.9 kg · m2. Its angular velocity decreases from 20.2 rad/s to zero in 257.2 s due to friction. What is the frictional torque acting?
If Cassie's near point is 110 cm, what's the power of the glasses if it helps her gain back the normal near point
An open-tube mercury manometer is used to measure the pressure in an oxygen tank. The atmospheric pressure is 1020mbar .1 bar = 105 N/m2. Determine the absolute pressure (in Pa) in the tank
Water is moving with a speed of 24.8 m/s through a pipe with a cross-sectional area of 3.0 cm2. What is the speed of flow at the lower level
200 g of lead (c=128 j/kg*K) at 100 degree (=100 C) are placed in a container filled with 200g of water (c=4190 j/kg*K) at 20 degree (= 20 C). How much Heat is exchanged with the environment
A flat sheet of ice (n = 1.309) has a thickness of 2.2 cm. It is on top of a flat sheet of crystalline quartz (n = 1.544) that has a thickness of 1.6 cm. how far (in cm) would it have traveled in a vacuum
1.)What is the magnitude of the acceleration of an electron at a point where the electric field has magnitude 6495 N/C and is directed due west 2.)Is the direction of the acceleration west or east
In a Certain Organic molecule, the nuclei of two carbon atoms are separated by a distance of 0.25 nm. What is the magnitude of the electric force between them
Two 480g blocks of wood are 2.0 m apart on a frictionless table. A 9.0g bullet is fired at 440m/stoward the blocks. What is the speed of the second block after the bullet stops
The rate of rotation of the smooth-walled tub is chosen so that a small piece of cloth will lose contact with the tub when the cloth is at an angle of ? = 73.0° above the horizontal. If the radius of the tub is r = 0.455 m, what rate of revolution..
a basketball (m= 0.60 kg) is dropped from rest. just before striking the floor the ball has a momentum whose magnitude is 3.1 kg x m/s. at what height was the basketball dropped
The cockroach's speed (relative to the ground) is 2.0 m/s, and the lazy Susan turns clockwise with angular velocity ω0 = 3.2 rad/s. The cockroach find out a bread crumb on the rim and, of course, stops.
Battery-powered electricity is very expensive compared with that available from a wall receptacle. Estimate the cost per kWh of an alkaline D-cell
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