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The loaded cab of an elevator has a mass of 3.0 x 103 kg and moves 176 m upthe shaft in 23 s at constant speed. At what average rate does theforce from the cable do work on the cab?
kW
A 82.5-kg climber is scaling the vertical wall of a mountain. How much is the rope stretched when it breaks his fall and momentarily brings him to rest
Four charges are located in the x-y plane as follows: q@(0,0); 3q @ (a,0); 2q @ (0,a) and -4q @ (a,a). What is the electric force at the center of this distribution
if car a is moving east at a speeed of 40mph realtive to the ground and car b is moving east at 30mph relative to the ground. what is the relative speed and direction of car b
Find the magnitude of the magnetic flux through the floor of a house that measures 23m by 18m . Assume that the Earth's magnetic field at the location of the house has a horizontal component of 2.4×10^?5T pointing north, and a downward vertical compo..
A singly charged ion of 7Li (an isotope of lithium) has a mass of 1.16×10?26kg. What is the radius of the ion's path in the magnetic field
On a banked race track, the smallest circular path on which cars can move has a radius of 109 m, Find the largest speed at which cars can move on this track without relying on frictio
q1. a staging that weighs 440 n supports two painters one 110 n and the other 460 n. the reading in the left scale is
A railroad car of mass 40900 kg moving at 3.35m/s collides and couples with two railroad cars,each of the same mass as the single car and moving in the same direction at 1.53m/s. what is the speed of three cars after the collision.
A proton with kinetic energy of 2.30 × 106 eV is fired perpendicular to the face of a large plate that has a uniform charge density, From what distance should the proton be fired so that it stops right at the surface of the plate
Time standards are now based on atomic clocks. A promising second standard is based on pulsars, what is the associated uncertainty
An object is placed 19 cm to the left of a converging lens of focal length 30 cm. Find the position and magnification of the final image
Jim's dog Sparky runs 55.0m northeast to a tree, then 70.0mwest to a second tree, and finally 20.0m south to a third tree
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