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A punch press with flywheel adequate to minimize speed fluctuations produces 120 punching strokes per minute, each providing an average force of 2000 N over a stroke of 50 mm. The press is driven through a gear reducer by a shaft rotating 300 rpm. Overall efficiency is 80%.
(a) What power (W) is transmitted through the shaft?
(b) What average torque is applied to the shaft?
A baseball outfielder throws a 0.150 kg baseball at a speed of 39.0 m/s and an initial angleof 27.0°. What is the kinetic energy of the baseball at the highest point of its trajectory?
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A tennis ball has a velocity of 26 m/s and a mass of 56.1 gram. After the ball hits a tennis racket, the velocity becomes twice that of the original speed and goes in the opposite direction. Compute the force between the racket and the ball
Some bacteria are propelled by motors that spin hair-like flagella.A typical bacterial motor turning at a constant angular velocityhas a radius of 1.9x10-8m, How long does it take the motor to make one revolution
In the hydrogen atom, what is the total energy (in electron volts) of an electron that is in an orbit that has a radius of 2.117 x 10-10 m
a proton moves in a constant electric field from point a to point b. the magnitude of the electric field is 6.4 times
6 - two equal masses of charge 36 nC each are suspended at the end of two 1-m strings of negligible mass, The ropes make and angle of 5 with respect to each other
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