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Two wires are identical, except that one is aluminum and one is copper. The aluminum wire has a resistance of 0.832. What is the resistance of the copper wire? Take the resistivity of copper to be 1.72 x 10-8 O·m, and that of aluminum to be 2.82 x 10-8 O·m.
Sunlight falls on two polarizers with their polarization axes oriented 57° to one another. What fraction of the light intensity is transmitted
A 2.10 x 10^3 kg car starts from rest at the top of a 4.70 m long driveway that is inclined at 25° with the horizontal. If an average friction force of 4.0 x10^3 N impedes motion, find out the speed of the car at the bottom of the driveway.
The angle of incidence at a solid/liquid boundary is 65.3°, and the index of refraction of the solid is n = 1.71.(a) What must be the index of refraction of theliquid such that the direction of the light entering the liquid isnot changed?
A solid sphere of mass 2.5 Kg and a radius .15m starts from rest at the top of the ramp inclined 15 degrees, and rolls to the bottom without slipping. What is the total kinetic energy of the sphere
An emphysema patient is breathing pure O2 through a face mask. how long will the cylinder last
A hoop and a disk, both of 0.48- m radius and 3.0- kg mass, are released from the top of an inclined plane 3.3 m high and 8.3 m long. What is the speed of the hoop
At t = 0, a stone is dropped from a cliff above a lake; 1.3 seconds later another stone is thrown downward from the same point with an initial speed of 31 m/s. Find the height of the cliff
a rotating merry-go-round makes one complete revolution in 4.0s.a what is the linear speed of a child seated 1.2m from
A certain particle of mass m has a momentum of 0.9mc. (For the following questions, leave all your answers in terms of m and/or c.) a) What is the particle’s speed? (Careful here….the answer is not 0.9c)
a 176-lb swimmer has a specific gravity of 1.03. what is the swimmers effective weight while under water? give your
A bullet with a mass of 4.0 g and a speed of 650 m/s is fired at a block of wood with a mass of 0.095 kg. What is the speed of the bullet when it exits the block
A mass (m) 100g is released from rest from 1.0m above the horizontal level. Find the vertical acceleration of the mass
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