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It takes an elevator 2.5 minutes to raise a vehicle with a weight of 3683 N from the floor to a height of 8 meters. What size (power) motor (in watts) does it take to do the job? Hint: this is a multiple step problem in which you must derive the variables needed to solve for problem in step one and then apply those values to the final solution of the problem. Watch your units.
An electric motor rotating a workshop grinding wheel at a rate of 1.09 102 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 2.50 rad/s2. (a) How long does it take for the grinding wheel to stop? s (b..
A toroid solenoid has a cross-sectional area of 0.460 cm2, a mean radius of 11.5 cm, and 1900 turns. If the material is removed from inside the solenoid and replaced by air, estimate the inductance of the solenoid
The tractor beam exerts a constant force of 4.0 104 N on the shuttlecraft. Both spacecraft are initially at rest. Explain how far does the starship move as it pulls the shuttlecraft aboard?
The rope of a swing is 3.2 meter long. Find the angle from the vertical at which a 77 kilogram man must begin to swing in order to have the same kinetic energy at the bottom as a1460 kilogram car moving at 1.55 m/s
Calculate the magnitude of the gravitational force exerted on a 611-kg satellite that is a distance of two earth radii from the center of the earth, What is the magnitude of the earth's acceleration
Light is incident on a thin prism for which n= 1.5. Find the angle of deviation for the emerging beam
A circular saw blade 0.200 m in diameter starts from rest. Evaluate the angular acceleration and evaluate the angle through which the blade has turned
What should be done with nuclear waste? Are our power and communication networks susceptible to "electromagnetic pulse"? IS hydraulic fracturing worth the associated risks
You have a spring attached to the bottom of a container. The spring is aligned vertically. The container is filled with water (density 1.0 x 103 kg/m3). How much does the block compress the spring
A conducting bar with a mass of 0.155 kg and a length of 16.0 cm is suspended touching two vertical electrical contacts which form an electric circuit with a battery that has an electric potential of 8.5 V. What is the resistance R that exists in t..
consider a piston cylinder with 0.5 kg of r-134a as saturated vapor at -10oc. it is now compressed to a pressure of 500
Boat A negotiates a curve whose radius is 405 m. Boat Bnegotiates a curve whose radius is 150 m. Each boat experiences the same centripetal acceleration. What is the ratio of the speed ofboat A to that of boat B?
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