Physics, 22.06.2019 20:30 cupcake3103670

# Aball is thrown from the top of a building with an initial velocity of 21.9 m/s straight upward, at an initial height of 51.6 m above the ground. the ball just misses the edge of the roof on its way down, as shown in the figure. (a) determine the time needed for the ball to reach its maximum height. (b) determine the maximum height. (c) determine the time needed for the ball to return to the height from which it was thrown, and the velocity of the ball at that instant. (d) determine the time needed for the ball to reach the ground. (e) determine the velocity and position of the ball at t = 5.35 s.

Answers: 1

Physics, 21.06.2019 15:00

Aparticle moves according to a law of motion s = f(t), 0 â‰¤ t â‰¤ 12, where t is measured in seconds and s in feet. f(t) = cos(Ï€t/6) (a) find the velocity at time t (in ft/s).

Answers: 3

Physics, 21.06.2019 18:10

Steam enters a turbine at a pressure of 1000 psia and a temperature of 1100Â°f with a mass flow rate of 20 lbm/s, and exits at a saturated vapor at 100Â°f. in this process, the turbine casing transfers 400 btu/s of heat to the engine room. the exiting steam leaves the turbine at a velocity of 500 ft/s. the exhaust steam is subsequently cooled in an adiabatic condenser by cooling water which enters the condenser at 40Â°f and leaves at 55Â°fÂ·the condensed steam leaves at 65Â°f at the same pressure as at the condenser inlet determine (a) the power produced by the turbine in horsepower, (b) the cross-sectional area of the turbine inlet and turbine exit in square feet, and (c) the volume flow rate of cooling water required in gallons per minute. show the two processes on a t-v diagram with respect to saturation lines.

Answers: 3

Physics, 21.06.2019 22:20

1400 kg car has a speed of 27 m/s. if it takes 7 s to stop the car, what is the impulse and the average force acting on the car?

Answers: 1

Aball is thrown from the top of a building with an initial velocity of 21.9 m/s straight upward, at...

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