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Q.The loaded cab of an elevator has a mass of 2500 kg and moves 215 m up the shaft in 22 s at constant speed. At what average rate does the force from the cable do work on the cab?
Q. What must the charge (sign and magnitude) of a particle of mass 1.49g be for it to remain stationary when placed in a downward-directed electric field of magnitude 700 N/C?
How fast must the car be travelling just as it leaves the cliff in order to clear the river and land safely on the opposite side.
The Hall voltage across a conductor in a 55 magnetic field is 1.9 . When used with the same current in a different magnetic field, the voltage across the conductor is 3.
What is an actual mechanical advantage of the system
The drawing shows an equilateral triangle, each side of that has a length of 2.00 cm. Point charges are fixed to each corner, as shown. The +4.0 C charge experiences a net force due to the charges qA and qB. This net force points vertically downwa..
A bead with a mass of 0.02 g and a charge of 20nC is free to slide on a vertical rod. At base of the rod is a fixed 20nC charge.
A "door closer" is attached to the door and the top of the door frame.When the door is open and at rest, the door closer exerts a torque of 4.8 {rm N} cdot {rm m}. What is the least force that you need to apply to the door to hold it open.
Compute the scalar product V.F
Calculate the coil's self-inductance. If the current decreases uniformly from 5.00 to 2.00 in 3.00, estimate the self-induced emf in the coil.
What is the speed of the arrow as it leaves the bow.
A 60kg pole vaulter running at 13m/s vaults over the bar. Her speed when she is above the bar is 0.7m/s. Neglect air resistance, as well as any energy absorbed by pole, and determine her altitude as she crosses the bar.
Hydraulic engineers often use, as a unit of volume of water, the "acre-foot", defined as volume of water that will cover 1 acre of land to a depth of 1 ft. A severe thunderstorm dumps 2.0 in. of rain in 30 min on a town of area 35 km2. What volume..
Consider the 642 N weights held by two cables shown. The left-hand cable had tension T2 and makes an angle of thelta2 with ceiling. The right-hand cable had tension 460 N and makes an angle of 47 degrees with the ceiling.
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