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A hiker determines the length of a lake by listening for the echo of her shout reflected by a cliff at the far end of the lake. She hears the echo 2.3s after shouting. The speed of sound in air is 343 m/s. Determine the length of the lake.
A gold wire 5.72 long and of diameter 0.850 carries a current of 1.19. Find the resistance of this wire
If the free ends of the two cylinders are maintained at constant temperatures of 93?C (steel) and 28?C(copper), how much heat will flow through the cylinders in 25 min
A radio antenna broadcasts a 1.0 MHz radio wave with 29kW of power. What is the wave's intensity 33km from the antenna
The effects of the spin of the earth
The Eskimo pushes the same 50.0-kg sled over level ground with a force of 2.25 102 N exerted horizontally, evaluate the coefficient of kinetic friction
Elaine went to her outside faucet to fill a 0.0189-m3 bucket with water to wash her car. How long does it take to fill the bucket completely
A horizontal wire of length 0.58 m, carrying a current of 7.2 A, is placed in a uniform external magnetic field, Determine the magnitude of the external magnetic field
The person in the drawing is standing on crutches. Assume that the force exerted on each crutch by the ground is directed along the crutch, determine the largest angle
In a spherical metal shell of radius R, an electron is shot from the center directly toward a tiny hole in the shell, What is the magnitude of the electron's acceleration
Long parallel wires separated by 7.5 cm carry 3.3 Amperes each in opposite directions. What magnetic force per length acts on the wires
At a distance d (d > L) under the point of suspension there is an infinite plane conductor. Find the frequency of the pendulum, for small amplitudes. You can neglect gravity. What criterion determines that that is valid
A 600g model rocket is on a cart that is rolling to the right at a speed of 3.0m/s. At what horizontal distance left of the loop should you launch
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