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A 610 kg elevator starts from rest and moves upward for 3.50 swith constant acceleration until it reaches its cruising speed,1.63 m/s.
(a) What is the average power of the elevator motorduring this period?
(b) What is the average power during an upwardcruise with constant speed?
A 5.0 gram piece of Styrofoam carries a net charge of - 5.0 X 10-6 C and floats above the center of a large horizontal sheet of plastic that has a uniform charge density on its surface. What is the charge per unit area on the plastic sheet?
A gas is allowed to expand isothermally until it reaches its final volume and its pressure is 2.97 atm. Find the heat absorbed by the gas during this process
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How much sound power will strike the eardrum of an airport worker 15.3 m from the aircraft? (Use 1.9 10-2 m as the diameter of the ear.)
A coil of wire is connected to a galvanometer. When a bar magnet is moved in and out of the coil, the galvanometer records a current. The current results because: pick the best answer? the coil acts like a transformer.
A fully loaded, slow-moving freight elevator has a cab with a total mass of 1150 kg, which is required to travel upward 49 m in 3.1 min, starting and ending at rest. The elevator's counterweight has a mass of only 1025 kg, and so the elevator motor m..
The distance between the plates of a parallel plate capacitor with air between the plates is 9 mm. what is the new energy stored in the capacitor
Tarzan has foolishly gotten himself into another scrape with the animals and must be rescued once again by Jane. What is Jane's (and the vine's) angular speed
One component of a metal sculpture consists of a solid cube with an edge of length 0.277 m. Find the cube's mass
A cubical block of wood 10cm on a side, floats at the interface between oil and water with its lower surface 1.50 cm below the surface
What is the smallest radius of an unbanked (flat) track around which a bicyclist can travel if her speed is 21 km/h
High-speed stroboscopic photographs show that the head of a 240-g golf club is traveling at 52 m/s just before it strikes a 46-g golf ball at rest on a tee. Find the speed of the golf ball just after impact
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