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A 40-N crate rests on a rough horizontal floor. A 12- N horizontal force is then applied to it. if the coefficients of friction are us = .5 and uk = .4 , the magnitude of the frictional force on the crate is?
As a freely falling object picks up downward speed, what happens to the power supplied by the gravitational force? Does it increase, decrease, or stay the same and Why.
A weight lifter raises a 972 N weight a vertical distance of 1.87 m. Compute the work done by the force exerted on the weight by the weight lifter
According to Equation 20.7, an ac voltage V is given as a function of time t by V = Vo sin 2ft, what is the smallest value of the time at which the voltage equals one-half of the peak-value
A coffee filter of mass 1.4 grams dropped from a height of 3 m reaches ground with a speed of 0.7 m/s. How much kinetic energy Kair did the air molecules gain from the falling coffee filter.
An airplane must reach a speed of 172 mi/h to take off. If the runway is 470 m long, what is the minimum value of the acceleration that would allow the airplane to take off productively.
The air inside a bicycle tirenpumphas 202 joules of work done on it as 66.1 joules of heat is conducted away from it
A full cylinder has an absolute pressure of 1.9 107 Pa when the temperature is 300 K. Find out the mass of oxygen in the cylinder.
Two balls , one of gold with a mass of 100 kg and one of wood with a mass if 1 kg, are suspended 1 meter apart. find attractive force the wooden ball acting on the gold ball
Three light bulbs each with a resistance of 50W, are connected in series to a 100 V power supply, find the current flowing through the third light bulb
Frames S and S' are moving relative to each other along the x and x' axes. They set their clocks to t = t' = 0 when their origins coincide, Compute the spacetime interval ?s between the events
A bullet is fired at an angle of 60o with an initial velocity of 200.0 m/s. Explain how long is the bullet in the air? What is the maximum height reached by the bullet?
An empty storage tank has a volume of 135 ft3. What is the buoyant force exerted on it by the air
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