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A spring stiffness k= 500 n/m is mounted against a 10 kg block. if the block is subjected to a force of 1 KN determine the velocity of the block at s=0.3 m when s=0, the block is at rest and the spring is uncompressed. The coefficient of fricktion is 0.2 . Use work and energy principle to find velocity.
a fuel cell stack consists of 75 fuel cells arranged in series each one 12cm2 in size. the stack operates at 80.c and
Air with a dry bulb temperature of 38°C and a dew point temperature of 20 °C is at a barometric pressure of 93.1 kPa. Without making use of the psychrometric chart for the given moist air determine the relative humidity
determine the thermal efficiency and the required steam flow rate kgs for a reheat-regenerative steam power plant which
describe the linear branched crosslinked and network molecular chain formations in polymers. by comparing i ldpe with
a hail storm caused nearly golf-ball sized hail to fall on a house. the hailstones were nearly spherical with a
refrigerant gas r-134 at 500k and 70 degrees c enters an air-cooled condenser heat exchanger and leaves the condenser
An adiabatic gas turbine expands air at 1,000kPa and 500C to 100kPa and 150C. Air enters the turbine through 0.200m^2 opening with an average velocity of 40 m/s and exhausts through a 0.910m^2 opening.
now consider the cooling process. it takes place in a heat exchanger hx. warm air. at 75 f is flows into one side of
Carbon dioxide (CO2) gas undergoes a process in a closed system from T1=100 F, p1=20 lbf/in^2 to T2=400 R,p2=50 lbf/in^2. The entropy produced due to internal irreversibilities during the process is determined to be 0.15 Btu/R per lb of gas.
Water flows at a rate of .04 m^3/s in a .12 meter diameter pipe that contains a sudden contraction to a .06 m pipe. Determine the pressure drop across the contraction section. How much of this pressure difference is due to losses and how much is due ..
a brayton cycle uses air and produces a net work of 14000 btus with an inlet state of 60f 14.7 psi and a compression
a piston-cylinder device maintained at a constant pressure of 0.1mpa contains nitrogen gas. it is cooled from
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