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A man pushes a lawn mower on a level lawn with a force of 208N. If 42% of this force is directed downward, and 54 W of power is expended in pushing the mower 4.7 m, how much time is spent in pushing the mower this distance?------s
The applied force acts for 5.9 s, during which time the angular speed of the wheel increases from 0 to 12 rad/s. The applied force is then removed, and the wheel comes to rest in 65 s. Illustrate what is the frictional torque?
Blocks A (mass 2.00 kg) and B (mass 15.00 kg) move on a frictionless, horizontal surface. Find the velocity of each block after they have moved apart
A person on earth notices a rocket approaching from the right at a speed of 0.78c and another rocket approaching from the left at 0.58c. What is the relative speed between the two rockets, as measured by a passenger on one of them?
A 16 g rifle bullet traveling 180 m/s buries itself in a 3.5kg pendulum hanging on a 2.7 m long string, which makes the pendulum swing upward in an arc. find the horizontal component of the pendulum's maximum displacement.
A window washer is standing on a scaffold supported by a vertical rope at each end. The scaffold weighs 192 N and is 3.1 m long. What is the tension in each rope
The car lift in a gas station operates with an air pressure of 2000 kPa. The piston of the car lift has a diameter of 30.0 cm. What is the mass of the largest car that the lift can raise
A nuclear device containing 8.00kg} of plutonium explodes. The rest mass of the products of the explosion is less than the original rest mass by one part in 10^4. How much energy is released in the explosion
An object is placed 20.0 cm from a first converging lens of focal length 10.5 cm. Calculate the magnification of the first lens
A beam of gamma rays from a distant galaxy is observed through two polarizing filters whose transmission axis is at a 45 degree angle relative to each other here on earth. What is the intensity of the output beam
A slide projector needs to create a 86 cm high image of a 2.0 cm tall slide, What focal length does the lens need and How far should you place the lens from the slide
A 0.24-kg ball on a stick is whirled on a vertical circle at a constant speed. When the ball is at the three o'clock position, Find the tension in the stick
a train has a mass of 4.65e6 kg and is moving at 51.4 kmhr. the engineer applies the brakes which results in a net
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