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A girl of mass 42 kilogram throws a ball of mass 0.5 kilogram against a wall. The ball strikes the wall horizontally with a speed of 10 m/s, and it bounces back with this similar speed. The ball is in contact with the wall 0.05 second. Obtain the average force exerted on wall by the ball?
a tunnel under a river is 2km long. at what frequencies can the air in the tunnel resonate? explain whether it would be
N particles diffuse in one dimension in the potential U(x)=ax2,with a>0. The particles have diffusion constant, D. Determine the steady-state concentration
What happens to the period of a mass-on-a-spring simple harmonic oscillator if the mass is doubled? What happens to the period if the spring constant is reduced by a factor of 3? How does the period depend on the amplitude of the oscillation?
A 240 gram block slides back and forth on a frictionless surface between two springs. Determine the speed of the block as it moves between the springs
A 3.7-kg block of iron (c=0.11 kcal/kgoC) that has been brought to a temperature of 1,062oC is placed on top of a 2.5-kg block of ice (c=0.5 kcal/kgoC) that has been cooled to -50oC. what is the final temperature of the iron block
The polar ice caps contain about 2.48 x 10^19 kilogram of ice. This mass contributes negligibly to the moment of inertia of the earth because it is located at the poles, Find what would be the change in the length of the day
A boy and girl are balanced on a massless seesaw. The boy has amass of 75kg and the girl has a mass of 50kg. If the boy sits 2metres from the pivot on one side of the seesaw where must the girlsit on the oppsite side.
If the energy that goes into evaporating one kilogram of water from Lake Michigan at 22.0 oC, how high (in m) would it be lifted
Two large parallel plates stand side by side with a distance of 2.10 cm between them, Find the acceleration of the electron, Find the magnitude and direction of the electric field in the region between the plates
A 1500 kg elevator starts from rest and moves upward with constant acceleration for 4.0 s until it reaches its operating speed of 2.0 m/s. Calculate the power required by the elevator motor while the elevator is operating at its operating speed
an infinitely long line of charge has a linear charge density of 6.50 times 10-12 . a proton is at distance 14.0 from
A candle is placed 1.270m in front of a converging lens. The image of the object is focused on a screen 1.376m behind the lens. What is the magnification of the image
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