Physics Answers

1kg of a fluid is compressed reversibly according to a law PV=0.25 where p is in bar and v is in m^3/kg. The final volume is 1/4 of the initial volume , calculate the workdone on the fluid and sketch the process of p-v diagram

Steam enters a turbine stage with an enthalpy of 3500 kJ/kg at 80 m/s and leaves the same stage with an enthalpy of 2900 kJ/kg and a velocity of 110 m/s. calculate the work done by the system. *

The pressure of a boiler is 15 kg/cm^3. The barometric pressure of the atmosphere is 768mm of Hg. Find the absolute pressure in a boiler. 

Given the barometric pressure of 14.7 psia (29.92 in Hg abs) make these conversions: a.) 90 psig to psia and to atmosphere, b.) 15 in Hg vacuum to in. Hg abs and to psia, c.) 20 psia to psi vacuum, and to Pa, d.) 15 in Hg gage to psia, to torrs, and to Pa. ( 1 atmosphere = 760 torrs) *

NASA is expected to launch a 2, 600 kg satellite 450 km above the Earth’s surface. What is the expected velocity of the satellite when it orbits the Earth?

A fluid at 0.7 bar occupying 0.09m^3 is compressed reversibly to a pressure of 3.5 bar according to a law pv^n. The fluid is then heated reversibly at constant volume until the pressure is 4 bar ;the specific volume is then 0.5m^3/kg . A reversible expansion according to a law pv^2=constant restores the fluid to its initial state. Sketch the cycle on p-v diagram and calculate

The mass of fluid present

The value of n in the first process

Net work of the cycle

What is the magnitude of a point charge that would create an electric field of 1.00N/C at points 1.00 m.

A horizontal spring (k=400N/m) with a mass of 0.70kg attached to it's undergoing simple harmonic motion. Calculate the(a) period of oscillation, (b) frequency, and (c) angular frequency of the oscillator

A particle of mass 2.5kg is suspended from a fixed point by a light inextensible string of length 1.8m.the particle moves in a horizontal circle on a smooth floor. calculate the angular speed of the particle if the tension in the string is 28 N

3.) Two spherical objects have masses of 3.1 x 10⁵ kg and 6.5 x 10³ kg. The gravitational attraction between them is 65 N. How far apart are their centers?