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In exercising, a weight lifter loses 0.123 kg of water through evaporation, the heat required to evaporate the water coming from the weight lifter's body. The work done in lifting weights is 1.45E+5 J. Assuming that the latent heat of vaporization of perspiration is 2.43E+6 J/kg, find the change in the internal energy of the weight lifter.
A filing cabinet weighing 556 N rests on the floor. The coefficient of static friction between it and the floor is 0.68, In which of the attempts does the cabinet move
A satellite moves in a circular orbit around the Earth at a speed of 4420 m/s. Determine the period of the satellite's orbit
a stel cable is used to keep a 2 m long 10 kg bar horizontal. one end of the bar is mounted to a wall. what tensional force now acts on the bar through the cable
what is the horizontal distance x between the two balloons.
Water undergoes viscous flow through two pipes with the same pressure difference between the ends. what is the flow rate through pipe 2
Why is the normal force of an object zero at the top of a hill (such as the hill of a roller coaster)? I'm doing a circular motion unit and I found a few problems where this is the case, and I was wondering how it works.
A force of 715 N is applied to a roller-coaster car to push it horizontally. If 2.72 X 10^4 J of work is done on car, how far has it been pushed.
A 91 g arrow is fired from a bow whose string exerts an average force of 115 N on the arrow over a distance of 78 cm. Illustrate what is the speed of the arrow as it leaves the bow?
A certain type of laser emits light that has a frequency of 5.6 x 10^14 Hz. The light, however, occurs as a series of short pulses, each lasting for a time of 3.9 x 10-11 s.
A pulley 18 in diameter is free to rotate about the horizontal axle. A 220 mass and a 420 mass are tied to either end of a massless string, and string is hung over the pulley.
Julie throws a ball to her friend Sarah. The ball leaves Julie's hand a distance 1.5 meters above the ground with an initial speed of 13 m/s at an angle 54 degrees
What is the initial (horizontal) velocity of the ball. An airplane needs to reach a velocity of 203 km/h to take off. On a 2000 m runway, what is the least acceleration necessary for the plane to take flight.
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