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A mover finds that a 20 kilogram crate initially at rest requires a 75 Newton horizontal force to set the crate in motion, but only a 60 Newton force to maintain a constant velocity.
a) Obtain coefficient of static friction between crate and floor.
b) Obtain coefficient of kinetic friction between crate and floor.
a 74- kg ice hockey player standing on a frictionless sheet of ice throws a 6.6- kg bowling ball horizontally with a
A freezer has a coefficient of performance of 2.40. The freezer is to convert 1.98kg of water at 26.0 oC to 1.98kg of ice at -5.00 oC in 1 hour. How much electrical energy is consumed by the freezer during this hour
Carol and robin share a house. to get to work carol walks north 1.5 km while robin drive west 7.5 km. How far part are their work place
would you be willing to back financially an inventor who is marketing a device that she claims takes in 25000j of heat
Consider the mass spectrometer shown schematically in the figure below. The electric field between the plates of the velocity selector is 5900 V/m, Calculate the radius r of the path for a singly charged ion
A light bulb is connected to a 240 Vwall socket. The current in the bulb depends on the time taccording to the relation I = (2.121 A) sin[ (439.6Hz) t ]. What is the frequency of the alternating current
A diffraction grating has a line density of 580 . This grating produces a 1st order maximum at a distance of 2.52 from the central maximum on a screen which is 5.40 away
the lob in tennis is an effective tactic when your opponent is near the net. it consists of lofting the ball over his
Objective questions based on kinematics.
A golf ball (m=.05 kg) and a cannonball (M=100 kg) collide head on. Before the collision, the two balls had equal speeds of 30 m/s and opposite directions. After the collision, the speed of the golf ball is approximately
Three negative charges of equal magnitude q are placed along a straight line, Find the electrostatic force on middle (second) charge
A soot particle, originally neutral, gets charged in a process that removes 27 electrons. Find its resulting charge
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