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Katie, a 30.0-kg child, climbs a tree a to rescue her cat who isafraid to jump 8.0m to the ground. How much work does Katie do inorder to reach the cat?
Two long, parallel wires separated by 5.00 cm carry currents in opposite directions. Find the magnitude of the force per unit length
To help keep her barn warm on cold days, a farmer stores 865kg of warm water. How many hours would a 2.00-kilowatt electric heater have to operate to provide the same amount of heat as is given off by the water as it cools from 20.0 degrees celcius t..
An AC generator is to have a maximum output of 340 V. Find the maximum current induced in the coil
Two football players are initially 2m apart. At the same instant they accelerate towards each other, Draw a picture. Define your coordinate system
A pipe is horizontal and carries oil that has a viscosity of 0.15 Pa · s. The volume flow rate of the oil is 4.6 10-5 m3/s. What is the absolute pressure at the input end
A 0.420 kg ice puck, moving east with a speed of 3.12 m/s, has a head-on collision with a 0.890 kg puck initially at rest. Assuming a perfectly elastic collision, What is the speed of the heavier puck
A nearsighted person cannot see objects clearly beyound 30cm(the far point). what is the power of the lens to correct the patients vision
You take a set of measurements for the wavelengths and frequencies of standing waves on a string that is under a tension of 1.96 N. What is the linear mass density of the string
A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of 44 dB by an observer 10 km away. What is the average power generated by the horn
A student is reading a lecture written on a blackboard. Thelenses in her eyes have a refractive power of 62.20 diopters, How far (in meters) is the blackboard from her eyes
An empty rubber balloon has a mass of 0.0120kg. The balloon is filled with helium at 0oC, 1atm pressure, and a density of 0.179kg/m3, What is the magnitude of the buoyant force acting on the balloon
A 75 kg parachutist descends through a vertical height of 310 m with constant speed. Find the increase in entropy produced by the parachutist, assuming the air temperature is 21°C.
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