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During exercise, a person may give off 145kcal of heat in 20min by evaporation of water (at 20?C)from the skin. The heat of vaporization for water at20?C is 585 kcal/kg.
How much water has been lost?
An airplane is flying horizontally with a speed of 1000 km/h(280m/s) when an engine falls off. avoid air resistance,assume it takes 30s for the engine to hit the ground.
A m = 10 kg block is released from a height of h = 3 m. It travels down a frictionless circular shaped ramp to the bottom where it encounters a rough surface. Find the coefficient of kinetic friction for the rough surface
the supersonic aircraft concorde has a length of 61.5m when sitting on th ground on a typical day when the temperature is 15.0 degrees C. what is the temperature of the concordes skin in flight
Two objects are maintained at constant temperatures, one hot and one cold. Two identical bars can be attached end to end, as in part a of drawing, or one on top of the other, as in part b. When either of these arrangements is placed between the hot a..
In fair weather, over flat ground, there may be a downward electric field of 155 N/C. (a) Assume that the Earth is a conducting sphere with charge on its surface.
The frequency of light emitted by a toaster is 2.5 GHz. How many toaster photons are required to heat the water
A swimming pool has dimensions 24.0 m x 11.0 m and a flat bottom. The pool is filled to a depth of 2.10 m with fresh water. What is the force exerted by the water at the bottom
How does the intensity change as position increases? What is the position value corresponding to the highest light intensity, What is the relationship between light intensity and position
question1a stable nucleus is composed of z protons and n neutrons. is the mass of nucleus identical to the sum of the
A physics TA pushes a 20.0-kg equipment cart at a constant velocity a distance of 24.0 m down the hall. determine the work done by the force of gravity acting on the cart
Calculate its average velocity for the entire trip. A horse canters away from its trainer in a straight line, moving 120 m away in 15.0 s. It then turns abruptly and gallops halfway back in 5 s.
If the cross-sectional area of the stream decreases by factor of 10× while passing through the dam, can you catch and save the weasel before it moves past the dam (X), down the waterfall?
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