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An elevator weighing 2500 N ascends at a constant speed of 8.0 m/s. How much power must the motor supply to do this?
A beam of hydrogen molecules (H2) is directed toward a wall, at an angle of 50° with the normal to the wall. What is the beam's pressure on the wall
An electric motor with a 2.7-hp output drives a machine with an efficiency of 35%. What is the energy output of the machine per second
A ball is thrown straight up from the edge of the roof of the building. A second ball is dropped from the roof a time of 1.01 s later. You may ignore air resistance.
However, the current increases by just 0.11 A when R1 is removed, leaving R2 connected across the battery. Find (a) R1 and (b) R2.
A particle is oscillating with simple harmonic motion with a period of T = 2.44 s, What is the amplitude of the particle's motion
A point charge Qpt= 10nC is surrounded by an insulating material and stuffed inside a spgerical steel shell iwth inner radius R1=1cm and outer R0=2cm; What is the net charge of the steel shell
Find the distance from the mirror to the point where the reflected rays meet.
What is the half life of the sample if the decay rate decay rate decreases from 175 KBq to 12.4kBq in 18 seconds
A moving body undergoes uniform acceleration while travelling in a straight line between points X, Y and Z. The distances XY and YZ are both 40m. The time to travel from X to Y is 12s and from Y to Z is 6s.
The electric field of an electromagnetic wave in a vacuum isEy = (17.0 V/m)cos((6.28 ×108)x??t), where x is in m and t is in s. What is the wave's magnetic field amplitude
The maximum torque experienced by a coil in a 0.80 T magnetic field is 8.4 10-4 N · m. What is the length of the wire from which the coil is made
What is the centripetal force that would be required to keep a 4.0 kg mass moving in a horizontal circle with a radius of 0.80 meters at a speed of 6.0 meters/second?
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