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A 685-kg elevator starts from rest and moves upward for 2.70 s by constant acceleration until it reaches its cruising speed, 1.75 m/s.
a) What is the average power of the elevator motor through this period?
b) How does this amount of power compare with its power through an upright trip by constant speed?
A solid metal sphere of radius a = 1.30 cm is surrounded by a concentric spherical metal shell of inner radius b = 1.90 cm and outer radius c = 2.40 cm. What is the surface charge density, sc, on the outer surface of the outer spherical conductor
How much heat does an engine with an efficiency of 26.0% absorb in order to deliver 2.00 kJ of work, How much heat is exhausted by the engine
Star Wars particles consist of a beam of charged particlesshot at a distant target. Let's assume that the beam consists of1.00 mA beam of 200 MeV protons coasting through free space. Determine the number density of the beam
Two particles are fixed to an x axis: particle 1 of charge-4.00*10-7 C at x = 6.00 cm, and particle 2 of charge +4.00*10-7 C at x = 18.0 cm. Midway between the particles, what is their net electric field?
an electron experiences a magnetic force of magnitude 4.60 x10-15 when moving at an angle of 60.0 degree with respect
A circular wheel has a radius R = 0.45 + or - 0.02 m. The wheel is observed to be rotating uniformly with period T = 2.00 +or- 0.05 s. Compute the frequency with which the wheel spins
Two boxes of mass 4.70 and 2.70 kg are in contact and are accelerated across a horizontal surface by an force of 28.24 N applied parallel to the surface and pushing on the lighter box. Find the acceleration of the two boxes
In a mall, a shopper rides up an escalator between floors. At the top of the escalator, the shopper turns right and walks 10.1 m to a store. At what angle is the escalator inclined above the horizontal
A 0.500 kg glider on an air track is attached to the end of an ideal spring with force constant 455 N/m; Calculate the max speed of the glider Vmax=____m/s
A jogger on a circular track that has a radius of 0.250 km runs adistance of 1.00 km. What angular distance does the jogger cover in radians
A thermodynamic system is operated at a constant pressure of 2 atm. What is the new volume of the system
To keep a door closed, a wooden stick is wedged between the floor and the doorknob. The stick exerts at B a 45-lb force directed along line AB. Swap that force with an equivalent force-couple system at C.
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