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each second 5e23 nitrogen molecules (m=4.65e23 g) collide with a 10cm2 wall assume that the molecules all travel with a common speed of 290m/s and strike the wall head on. What is the pressure on the wall?
Copper has an electrical resistivity %u03C1 = 1.72 x 10-8 %u03A9m. What is the electrical resistance of a copper wire with a radius of 1.0 mm and a length of 25 m
Assume a light ray hits the surface of the water in a container 39 inches deep at an angle of incidence of 18 degrees. Determine the time taken for the light to hit the bottom of the container
The bellow of a territorial bull hippopotamus has been measured at 110 dB above the threshold of hearing
A playground merry-go-round (uniform disk with mass M=150kg and radius R=2m) rotates on a frictionless axle through its center. What is the kinetic energy of the child-merry-go-round-system
A flask is filled with 1.50 L (L = liter) of a liquid at 98.0 °C. What is the coefficient of volume expansion of the liquid
a ball is thrown upward from the roof of a building, passes the roof going down three seconds later, how fast did the ball strike the ground
The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. What is the weight of the heaviest bear that the ice can support without sinking completely beneath the water
A sled of mass m is pushed for 5 seconds at a constant force. A sled of mass M (more) is also pushed for 5 seconds. What is the energy of each sled
What is the highest value of the magnetic force.
A ball on the porch rolls 60 {rm cm} to the porch's edge, drops 40 {rm cm}, continues rolling on the grass, and eventually stops 80 {rm cm} from the porch's edge.
What is the acceleration of two falling sky divers (mass 112.0 kg including parachute) while the upward force of air resistance is equal to one-fourth of their weight.
A luge and its rider, with a total mass of 82 kg, emerge from a downhill track onto a horizontal straight track with an initial speed of 43 m/s. Assume that they stop with the constant deceleration of 3.2 m/s2.
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