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A(n) 716 kg elevator starts from rest. It moves upward for 4.36 s with a constant acceleration until it reaches its cruising speed of 2.14 m/s. The acceleration of gravity is 9.8 m/s^2. Find the average power delivered by the elevator motor during this period. Answer in units of kW.
A certain ohmic resistor has a resistance of 45 ohms. A second resistor is made of the same material but is two times as long, What is the effective resistance of the two resistors in series
A drag force on a falling object in air is directly proportional to the square of its velocity. what will be the kinetic energy of an object
A 35.0-mH inductor has a reactance of 1.80 k. What is the frequency of the ac current that passes through the inductor
Suppose that the sound level of a conversation is initially at an angry 72 dB and then drops to a soothing 50 dB. determine the initial and final sound intensities
q1. assume acceleration is constant during each time interval but not necessarily the same in both intervals what
Two submarines are on a secret mission and need to arrive at a location in the middle of the Atlantic Ocean at the same time. They start out at the same time from positions equally distant from the redezvous point.
A small circular loop of wire of radius 5.0 cm and resistance R = 1.7 10-3 Ω is centered inside a large circular loop of wire of radius 50 cm, Find the average current in the smaller loop during this time interval
A high diver leaves the end of a 5.0 m high diving board and strikes the water 1.4 s later, 2.6 m beyond the end of the board. determine the maximum height (in meters) above the water reached
A block with a mass of 2.45kg is pushed up an incline plane that makes an angle of 34.2o with respect to the horizon. How much work did the frictional force do on the block
A 79 kg pole-vaulter falls from rest from a height of 4.6 m onto a foam-rubber pad. The pole-vaulter comes to rest 0.30 s after landing on the pad. compute the athlete's velocity just before reaching the pad.
A cylindrical fishing reel has a moment of inertia of I = 6.61E-4 kg*m2 and a radius of 3.98 cm. A friction clutch in the reel exerts a restraining torque of 1.47 N*m if a fish pulls on the line. What is the force of the fish on the line
The acceleration of a particle is given by ax(t)=? 2.10m/s2 +( 3.03m/s3 )t, What will be the velocity at time t = 3.94s
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