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A 0.89 meter aluminum bar is held with its length parallel to the east-west direction and dropped from a bridge. Just before the bar hits the river below, its speed is 17 m/s, and the emf induced across its length is 5.1 x 10-4 V. Assuming the horizontal component of the Earth's magnetic field at the location of the bar points directly north,
(a) Find the magnitude of the horizontal component of the Earth's magnetic field?
(b) state the number of which end of the bar is positive: 1 = east, 2 = west.
An object of mass 4.0 kg starts at rest from the top of a rough 30 degree inclined plane of height 10 m. If the speed of the object at the bottom of inclined plane is 10 m/s, how much work does friction do on this object as it slides down incline?
q1. a mountain climber in the process of crossing between two cliffs by a rope pauses to rest. she weighs 550 n. as
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An object at rest explodes into three peices of equal mass. One moves east at 20 m/s; What is the velocity of the third piece
A two stage rocket with a total mass of 925kg is traveling at a speed of 6.6 10^3 m/s away from the earth . A predesigned explosion separates into two sections of equal mass that move with a speed of 2800m/s relative to each other along the origin..
A large wheel is coupled to a wheel with half the diameter. How does the rotational speed of the smaller wheel compare with that of larger wheel? How do the tangential speeds at the rims compare (assuming the belt doesn't slip).
Two canoes are 10 m apart on a lake. Each bobs up and down with a period of 4.0 seconds. When one canoe is at its highest point, the other canoe is at its lowest point. Both canoes are always within a single cycle of the waves. Decide the speed of th..
a solid block is suspended from a spring scale. the reading on the scale when the block is completely immersed in water
The drawing shows two wires that both carry the same current ofI = 66.1 A and are oriented perpendicular to the plane ofthe paper. The current in one wire is directed out of the paper, while the current in the other wire is directed into the paper..
A charged particle is moving horizontally westward with a velocity of 3.5 × 106 m/s in a region, What is the charge on the particle
Equipotentials between two parallel lines with a floating circular electrode: I dont need to know the exact potentials, What should be the potential inside the electrode
a star of mass 2.0 1031 kg that is 4.4 1020 m from the center of a galaxy revolves around that center once every 1.8 x
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