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In the operation of a hydraulic jack, suppose one has area 0.0200 m^2 and the other area 0.0500 cm^2. The two pistons are initially level. If a force of 250 N is exert on the input piston, what force is exerted by the output piston?
A 1500kg wrecking ball hangs from a 20m -long cable. The ball is pulled back until the cable makes an angle of 17.0° with the vertical. By how much has the gravitational potential energy of the ball changed?
A baseball fan sitting in the cheap seats is 255m from home plate. How much time elapses between the instant the fan sees a batter hit the ball and the moment he hears the sound?
A 14.2-g piece of Styrofoam carries a net charge of -0.69 µC and is suspended in equilibrium above the center of a large, find the charge per unit area on the plastic sheet
A space shuttle, in a 300km high orbit, releases a 100 kg payload attached by a 10 km long massless rope. Assuming initial motions of lowering payload have damped out and the shuttle and payload are flying in steady state conditions.
consider a horizontal parallel plate capactor where the size of the plates is much larger than the spacing between the
One type of slingshot can be made from a length of rope and aleather pocket for holding the stone. Determine the angular speed of the stone
question how many electrons must be removed from each of two 4.6-kg copper spheres to make the electric force of
A 12 V battery causes a current of 0.7A through a resistor. How many joules of energy does the battery lose in a minute
A small ferryboat is 4.00 m wide and 6.00 m long. When a loaded truck pulls onto it, What is the weight of the truck
The front end of an automobile has been designed so that upon impact it progressively crumples by as much as .70m. What is the magnitude of the deceleration
1. explain what is the instantaneous values of ac and phase shift angle are. explain what the effective and average
Rail guns can accelerate an object by using the magnetic force on a current carrying device. Calculate the speed of the wire as it leaves the rail
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