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During exercise, a person may give off 182 kcal of heat in 30 min by evaporation of water from the skin. How much water has been lost? (Assume a temperature of 20°C.)
___________ kg
In changing the state of a gas adiabatically from an equilibrium state A to another equilibrium state B, how much is the net work done by the system in the latter case
A hot-air balloon is ascending at the rate of 14 m/s and is 57 m above the ground when a package is dropped over the side. (a) How long does the package take to reach the ground? (b) With what speed does it hit the ground?
A small block of mass m = 1.5 kg slides, without friction, along the loop-the-loop track shown. the block starts from the point P a distance h = 54 m above the bottom of the loop of radius R = 17.0 m. What is the kinetic energy of the mass at the ..
A 5-kg bowling ball (solid sphere, ) with a diameter of 22 cm is rolling without slipping on a smooth, level surface with a speed of 7.0 m/s. What is the ball's angular momentum
The hot glowing surfaces of stars emit energy in the form of electromagnetic radiation. It is a good approximation to assume e=1 for these surfaces. Find the radius of the star
When two carts having the same mass and the same speed collide and bounce off of each other elastically, what is the final total momentum of the carts
a man walks westward on ship with a speed of 4km/hr. the ships propeller drives it 15km/hr south. what is the actual speed of the man relative to earth
Green light at 543 nm is diffracted by a grating with 3000 lines per cm. Through what angle is the light diffracted in the first order
Calculate the gradient of V in each region
How numerous atoms does each hand contain
generator has a terminal voltage of 115 V when it delivers 18.0 A, alculate the emf (e m f) and the internal resistance (r) of the generator
question1a dock worker loading crates on a ship finds that a 22 kg crate at first at rest on a horizontal surface
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