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Problem 1 - At the instant of leaving the ramp, the skier has a speed of 20 m/s at an angle θA = 30° with the horizontal. In addition to gravity, the wind gust exerts a horizontal acceleration of 2t m/s2 to the left on the skier. Determine the flight time for the skier to strikes the ground. [Hint: You may need to find the root of a higher-order polynomial]
Problem 2 - The motorcyclist increases his speed at the race of v = (0.04s) ft/s2 from A to B along a circular path, where s is in feet and s = 0 at A. If he starts at vA = 3 ft/s, determine the magnitudes of his velocity and acceleration at B.
(a) In a throttling process, energy and exergy are conserved. (b) If unit costs are based on exergy, we expect the unit cost of the electricity generated by a turbine to be greater than the unit cost of the high-pressure steam provided to the turb..
a plane wall with surface temperature 350c is attached with straight rectangular fins k 235 wm k. the fins are exposed
Draw the thermal circuit for the wall and label all temperatures, heat rates, and thermal resistances. What insulation thickness L is required to maintain the outer wall surface at a safe-to-touch tempera- ture of To = 40°C?
You are given two different gases that are at the same conditions and you mix them in equal volumes. Determine the molar entropy of mixing, ?
A piston cylinder assembly contains a two phase liquid vapor mixture of h2o at 200lbf/in^2 with a quality of 80%. The mixture is heated and expands at a constant pressure until the final temperature of 480 degrees F is reached. Determine the work for..
A spring-loaded piston-cylinder device is initially filled with 0.13 lbm of an R-134a liquid-vapor mixture whose temperature is ?30°F and whose quality is 80 percent. The spring constant in the spring force relation F = kx is 37 lbf/in, and the pisto..
What is the amount of work required to stretch a linear spring from its rest position by an amount of 0.20m if it has a spring constant of 45 kN/m. A water pump increases the water pressure from 15 psia to 55 psia. Determine the power input required,..
for this problem we will be analyzing a power amplier that is surrounded by air at 25c while the case which is
Methane gas flows through a horizontal constant area pipe of 15 cm diameter. At section 1 p1=6 bars, T1=66 C and v1=30 m/s. At section 2 T2=38 C and V2=110 m/s.
find the force f required to hold the plug in place at the exit of the water pipe. the flow rate is 1.5 m3s the
an ideal otto cycle has a compression ratio of 8. at the beginning of the compression process air is at 95kpa and
the electric power needs of a community are to be met by windmills with 10-m-diameter rotors. the windmills are to be
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