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A ball is dropped with a velocity v0 and an angle a with the vertical onto the top step of a flight of stairs consisting of 10 steps. The ball rebozmds and bounces down the steps where the coefficient of restitution between ball and step is e= 0.6 . The friction between ball and stairs is negligible. Use values of v0 from 1.5 m/s to 3.0 m/s in 0.5-m/s increments, andvalues of a from 18° to 26° in 2° increments. By computational programming detemine
(a) if the ball bounces down the steps without skipping any step,
(b) if the ball bounces down the steps without bouncing twice on the same step.
nitrogen slowly expands from an initial volume of 0.025 m3 to 0.05 m3 at a constant pressure of 400 kpa. then heat is
The angular acceleration of a shaft is defined by the relation a = -0.25w, where a is expressed in rad/s^2 and w in rad/s. Knowing that at t=0 th angular velocity of the shaft is 20 rad/s, determine the time required for the shaft to come to rest.
when designing a front end loader what considerations must you make in the machine how it might be used and the type of
A rigid vessel contains superheated water at 200 psia and 500 f. the vessel is cooled until the temperature is 200 f. determine the final pressure, specific volume, quality of the water. Draw the t-v diagram for the process.
a rocket has an initial mass of 25000 kg of which 20000 kg is fuel and oxygen. it is propelled directly upward from
oxygen at 100 kpa 27degc is compressed to 1 mpa in an adiabatic compressor whose isentropic efficiency is 0.80.
A collar B of weght W can move freely along thevertical rod. The constant of the spring is k and the spring is unstretched when theta=0. Derive an equation in W thrta k and l that must be satisfied when h collar is in equilibrium.
Saturated liquid water is kept in a piston-cylinder-weight assembly at 100 kPa. Heat is added from a reservoir at 120 C so that saturated vapor is formed. Estimate the absolute availabilities in kJ/kg of saturated liquid and vapor.
a wet compression refrigeration cycle uses hfc-134a as the working fluid and operates between 75 f and 8 f. use a mass
if the volume of a bucketful of water is described by the normal distribution with a mean of 2.7 gallons and a standard
1. the initial state of one mole of a monatomic ideal gas is p10 atm and t300k. calculate the change in the entropy of
The yearly average solar flux incident on a horizontal surface in the United States is about 180 W/m2. The average total energy demand in the United States is approximately 100 quads (100 × 1018 ) per year. Assuming an average efficiency of PV cells ..
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