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Mary weighs 505 N. She walks down a flight of stairs to a level 5.50 m below her starting point. What is the change in Mary’s potential energy?
two flexible wires (massless) suspend a 10 cm-long conductor in the magnetic field with b = 4.2T. what is the current to let the wire just have zero tension
The origin of the coordinate system and with a label at their heads. Two of these vectors are given in terms of the unit-vectors I and j as
A 150 turn conducting coil with a radius of 18.3cm rotates ata frequency of f = 49.0Hz in a magnetic field B =0.230T. Calculate the generated rms emf
If an object on a horizontal frictionless surface is attached to a spring, displaced, and then released, it oscillates. Estimate the frequency of the motion
The force of an explosion on the piston of a gasoline engine is due to the change of momentum of the gas particles. What must be the speed of the molecules of gas after the explosion
The springs of a 1700-kg car compress 4.90mm when its 63.0-kg driver gets into the driver's seat. If the car goes over a bump
At one point in space, the electric potential energy of a 10 charge is 34. If a 25 charge were placed at this point, what would its electric potential energy be
The measured conductivity of Cu at Room Temperature is 5.88 x 107/ohm.m and the Fermi energy for Cu is 7.03 eV, Find the mean free path( mfp) of electrons in copper
If the average velocity of an object is nonzero in some finite time interval, which of the following must be true during this interval? (Select all that apply.)
A painter (m=70 kg) is standing a distance of 0.6 m from the top of a ladder (mass 40 kg and length 2.5 m). Find the conditions for static equilibrium of the ladder with the painter on top
While visiting Planet Physics, you toss a rock straight up at 14m/s and catch it 2.5s later. determine the mass of Planet Physics
q. a 30 gram mass is hanging from a spring whose unstretched length is 20 cm and whose spring constant is 2.5 nm. in
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