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A resistor is made of a material that has a resistivity that is proportional to the current going through it. If ithe voltage across the resistor is doubled, what happens to the power dissipatted by it?
a) It doubles.b) It quadruples.c) It increases by a factor of 2^3/2d) It increases by a factor of 2^1/2
A 25.8-mW laser beam of diameter 1.99 mm is reflected at normal incidence by a perfectly reflecting mirror. Calculate the radiation pressure on the mirror
The suspended 2.82 kg mass on the right is moving up, the 2.2 kg mass slides down the ramp, and the suspended 8.1 kg mass on the left is moving down. There is friction between block and ramp. What is the acceleration of a three block system.
A 1.5 {rm kg} block rests on top of a 7.5 {rm kg} block. The cord and pulley have negligible mass, and there is no significant friction anywhere. What force F should be applied to bottom block so the top block accelerates to the right at 2.60 m/s^..
The speed of an arrow ?red from a compound bow is about 51 m/s. An archer sits astride his horse and launches an arrow into the air, What is the height of the projectile
Two particles of masses m and 3.00m are moving toward each other along the x-axis with the same speed v. They undergo a head on elastic collision and rebound along the x- axis. Find out the final speed of the heavier object.
two forces F1 and F2 act a body of mass m on.If m=5.0 kg,F1=3.0 N and F2=4.0 N find the vector of acceleration of the body
A baseball player friend of yours wants to determine his pitchingspeed. You have him stand on a ledge and throw the ballhorizontally from an elevation 7.00 m above the ground. The ball lands 30.0 m away.
Two identical coaxial coils of wire of radius 39.7 cm are directly on top of each other, separated by a 3.03 mm gap. Determine the magnitude that the current in the upper coil
A 1.5kg ball and a 3.0kg ball are connected by a 3.0m long rigid, massless rod. What torque will bring the balls to a halt
Charge A and Charge B are 5.00m apart, A is +3.00 C and charge B is +7.00C, How far from charge A is charge C
An observer, whose eyes are 1.99 m above the ground, is standing 35.0 m away from a tree. The ground is level, and the tree is growing perpendicular to it. The observer's line of sight with the treetop makes an angle of 23.0° above the horizontal. Ho..
A circular loop of wire in the horizontal plane carries a counterclockwise current, as viewed from above. compute the magnitude of the magnetic field at the center of the loop?
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