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Two wires are identical, except that one is gold (resistivity = 2.44×10-8 ?·m) and the other is NiChrome (resistivity = 1.10×10-6 ?·m). The gold wire has resistance of 2.39 m?. What is the resistance of the NiChrome wire?
Reluctant diver Dave is hanging by his fingertips at the high-dive board, a distance of 8m from the water. His friend pries his fingers from the board, How long does it take Dave to reach the water
The specific heat of a 100-g block of a substance is to be determined.The block is placed in a 25-g copper calorimeter holding 60 g of water at 20°C. Determine the specific heat of the block
An 81-kg person puts on a life jacket, jumps into the water, and floats. The jacket has a volume of 3.1 *10^-2 m^3 and is completely submerged under the water. What is the density of the life jacket
A contact lens is made of plastic with an index of refraction of 1.58. The lens has an outer radius of curvature of +1.99 cm, What is the focal length of the lens
You are driving to the grocery store at 24 m/s. You are 115 m from an intersection when the traffic light turns red. Suppose that your reaction time is 0.50 s and that your car brakes with constant acceleration. How far are you from the intersecti..
a heavy but uniform rope of length l is suspended from a ceiling .a particle is dropped from the ceiling at the instant when the bottom end is given the jerk. where will the particle meet the pulse
A steel piano wire 1.35 m long has a cross- sectional area of 0.00751 cm2. When under a tension of 68.9 N, how much does it stretch
Two blocks are connected over a massless, frictionless pulley, What is the value of the tension in the string
A car traveling at 30 m/s runs out of gas while traveling up a 20° slope. How far up the hill will it coast before starting to roll back down
A 192-kg satellite is in circular orbit around the Earth and moving at a speed of 4.55 km/s. How much work must be done to move the satellite into another circular orbit
how much work is required to accelerate a proton from rest up to a speed of 0.957c, what would be the momentum of this proton
A water gun is filled and pumped up. It is held horizontal and fired at a height of .95 m above the ground. Determine the gauge pressure of the water in the gun's reservoir
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