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A flea is able to jump straight up about 0.38 meter. It has been said that if a flea were as big as a human, it would be able to jump over a 100 story building! When an animal jumps, it converts work done in contracting muscles into gravitational potential energy (with some steps in between). The maximum force exerted by a muscle is proportional to its cross sectional area, and the work done by the muscle is this force times the length of contraction. If we magnified a flea by a factor of 850, the cross section of its muscle would increase by 8502 and the length of contraction would increase by 850. Find how high would this superflea be able to jump? (Do not forget that the mass of the superflea increases as well.)
The power output of a car engine running at 2900 rpm is 300 kW. How much work is done per cycle if the engine's thermal efficiency is 10.0%
A simple of helium gas occupies 5 liters at 22degree C and a gauge pressure of 200,000 pascals. What is the mass of the gas
Vector B has magnitude of 8.0 at an angle of -10.0 o from the x-axis. Let C=A+B. Let D=A-B. Let V=2*A-B. What is the x-component of vector C. What is the y-component of vector C.
A football is thrown horizontally from the top of a building 0.10 kilometer high. Find the speed of the ball just before it strikes ground
1 a 0.84 kg copper rod rests on two horizontal rails 0.56 m apart and carries a current of 65 a from one rail to the
A mechanic jacks up the front of a car to an angle of 8.0 degrees with the horizontal in order to change the front tires. Calculate the magnitude of the torque excerted by the jack
A sports car traveling at 24.7m/s slows at a constant rate to a stop in 16s. What is the displacement of the sports car in this time interval
Three horizontal forces act on a packing crate on a horizontal surface: 600 N to the left, 200 N to the right, and friction. The packing crate remains at rest. The weight of the crate is 400 N. If the 600 N force is removed, the net force acting on t..
The equation of a transverse wave traveling along a very long string is given by y = 6.9 sin(0.025(pi)x + 4.5(pi)t), Determine the transverse displacement
The edge of the thimble of a micrometer moves a distance of 2.0 mm when it is given four complete revolutions. Find the pitch of the micrometer. If the number of divisions on the circular scale is 50, calculate the least count of the micrometer. U..
what force is needed to pull a 150 pound sled along a horizontal surface? The coeficient of kinetic friction is 0.10 and the sled is pulled by a rope that makes the angle of 0 degree with the horizontal. There is no acceleration.
A 67.5 kg circus performer slides4.10 m down a pole to the circusfloor, starting from rest. What is the kinetic energy of the performer as shereaches the floor if the frictional force on her from the pole is negligible
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