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Air flows from a reservoir through a nozzle into a receiver. The reservoir is maintained at 400 kPa absolute and 20-C. The nozzle has a 10-cm-diameter throat and a 20-cm-diameter exit. Determine the receiver pressure needed to locate a shock wave at the exit. For that pressure, calculate the mass flux and the velocity just before the shock.
A Stuntman with mass 75.0 kilogram falls from a height of 26 m onto several mattresses and compresses it 0.875 meter before he is brought to rest, find the average force exerted by mattresses on the stuntman
A cockroach of mass m lies on the rim of a uniform disk of mass 7.00 m that can rotate freely about its center like the merry-go-round. At first the cockroach and disk rotate together with an angular velocity of 0.220 rad/s. Then the cockroach walks ..
A 0.61-kilogram metal sphere oscillates at the end of a vertical spring. what is the spring constant of the spring
As a spaceship flies past with speed , you observe that 1.0000 s elapses on the ship's clock in the same time that 1.0000 min elapses on Earth. How fast is the ship traveling, relative to the Earth
A flea is able to jump straight up about 0.56 m. 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, How high would this "superflea" be able to jump
Calculate the capacitance of an air filled parallel plate capacitor given a plate seperation of .001 meters and a plate area of .8 meter^2
Two cars are moving. The first car has twice the mass of the second car however only half as much kinetic energy. When both cars increase their speed by 5.0 m/s, they have the similar kinetic energy. Compute the original speeds of the two cars.
A 70-kg astronaut floating in space in a 110-kgMMU (manned maneuvering unit) experiences an acceleration of 0.029 m/s2 when he fires one of the MMU's thrusters. What is the thrust of the thruster
n = 4.64 mol of Hydrogen gas is initially at T = 343 K temperature and pi = 2.01×105 Pa pressure. How much work did the external force perform
A line in the x-ray spectrum of gold has a wavelength of 18.5 pm (=18.5 x 10^-7 m), What is the energy of the lower stationary state
two shortwave radio antennas broadcast identical in-phase signals at the same frequency. the transmitters are 176.0 m
Consider a gas of photons in a cavity with a single photon mode at finite temperature τ. Show that the entropy of the gas can be expressed in terms of the average photon number as
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