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A 23kg child eats a candy bar containing 230 kcal of chemical energy. If the conversion to mechanical energy was 100% efficient (and it isn't), how high a hill (in meters) can the child climb before needing another snack?
You take the elevator to the roof of midtown skyscraper that is 100 meters high. What was the velocity of your souvenir just before it hit the ground
an infinitely long line of charge has a linear charge density of 6.00times10-12 cm . a proton is at distance 14.0 cm
A source of electromagnetic waves radiates power uniformly in all directions at a single frequency. At a distance of 5.00 km from the source, What is the average power radiated by the source
A 50-gram ruler is suspended from two strings, attached at 10cm and 80cm. (See figure) A mass m = 150 g is suspended from the 30cm point. The ruler is in equilibrium. What are the tensions in the two strings
a rubber ball dropped from a height of 2 bounces back to a height of 1. draw the balls position and velocity graphs
A thin lens forms an image of an overhead electric lamp on a piece of paper. The distance to the lamp from the lens is 148 cm; the distance to the paper from the lens is 16.0 cm. What is the focal length of the lens?
Which pulls harder gravitationally, the Earth on the Moon, or the Moon on the Earth? Which accelerates more? Explain your answers in terms of relevant principles of physics.
a spherical drop of water carrying a charge of 90pc has a potential of 270 v at its surface, what is the potential in the new drop
A rectangular barge, 5 m long and 2 m wide, floats in fresh water. How much deeper would it go if there were a 500kg horse on it.
In order to drink from your glass you first need to lift it to your mouth. As you begin to lift your 0.20 kg glass of water, it is accelerating upwards at 0.090 m, What is the net force acting on the glass
A simple pendulum consists of a ball connected to one end of a thin brass wire. Determine the change in the period of the heated pendulum
A 140-m-wide river flows due east at a uniform speed of 3.9 m/s. A boat with a speed of 7.8 m/s relative to the water leaves the south bank pointed in a direction 39o west of north. How long does it take for the boat to cross the river
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