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A 15.0 kg box initially sits at the bottom of a frictionless ramp. It is pulled by a cable to the top of the ramp, which is 2.5 m higher than the bottom of the ramp, and brought to a stop. How much work does each force acting on the box do during the lift?
The Earth has a surface temperature around 270 K and an emissivity of 0.8, while space has a temperature of around 2 K. If the Earth is in thermal equilibrium, how much power must the Earth absorb from the Sun
A construction company is building a dam. The construction engineers want to calculate the thickness of the concrete wall to retain water. The water depth right next to the dam will be 100m. What should be the thickness of the retaining wall on th..
How much work would it take to move a positive charge, 1uC, from the negative side of a parallel plate combination to the positive side when the voltage difference across the plates is 100V
What is the moment of inertia of the object about an axis at the center of mass of the object, What is the moment of inertia of the object about an axis at the left end of the rod
A ball of mass m=1.5kg is placed on the platform supported by a spring with k=250 n/m. initial velocity of the ball is 0. find how far down will move the platform. do the same if ball is thrown on the platform with velocity 10 m/s directed downwar..
a football punter accelerates a football from rest to a speed of 11 ms during the time in which his toe is in contact
q1. two trains each having a speed of 38 kmh are headed at each other on the identical straight track. a bird that can
Suppose one gallon of gasoline produces 1.1 108 J of energy, and this energy is sufficient to operate a car for 43 miles. how many miles would the car go on a single tablet
The spring is kept from pushing them apart, since they are holding each other. When they release their arms, Al moves off in one direction at a speed of 1.16m/s, while Jo moves off in the opposite direction at a speed of 0.973m/s. Assume that frictio..
A 600 g steel block rotates on a steel table (μk = 0.6) while attached to a 1.1 m long hollow tube. Compressed air fed during the tube and ejected from a nozzle on the back of the block exerts a thrust force of 4.6 N perpendiculars to the tube. The m..
A46dB sound wave strikes an eardrum whose area is4.0multiplied by10-5m2. How much energy is absorbed by the eardrum per second
when an electron circles in a uniform circular motion what would happen if we increased the magnitude of the magnetic
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