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During a 100 m sprint, Usain Bolt reaches his maximum speed in 2 seconds from rest with constant acceleration. He then maintains this maximum speed until he reaches the 90 m mark, when he peeks back
Calculate the work required to compress air from standard atmosphereic pressure to 2.3 atm in KJ/Kg air. Assume a polytropic process constant specific heats and and exponenent of 1.25.
A vessel contains 2 litres of gas at a pressure of 300kpa and a temperature of 27 degrees C. 3 litres of gas at the same temperature and pressure are forced into the vessel.
Its maximum altitude is h. Determine and plot the fraction f2 of the total flight time that the projectile is above the level f1h, where f1 is a fraction which can vary from zero to 1. State the val
Assuming ideal-gas behavior for air, steady flow, and negligible effects of kinetic and potential energy determine the power input (kW) to the compressor.
A 0.15-m-diameter pulley turns a belt rotating the driveshaft of a power plant pump. The torque applied by the belt on the pulley is 200 N m, and the power transmitted is 7 kW.
Rope BCA passes through a pulley at point C and supports a crate at point A. Rope segment CD supports the pulley and is attached to an eye anchor embedded in a wall.
Knowing that Es = 200 GPa and Ea = 70 GPa determine (a) the normal stresses in the steel core and the aluminum shell, (b) the deformation of the assembly Rs=25mm, Ra=62mm, L=250mm
For each of the following cases, determine the internal energy and the enthalpy using the compressed liquid tables and also approximate them using the saturated liquid tables.
Determine the liquid height at the edge. Determine the difference between the pressure at the center and the edge of the bottom surface
Three resistors connected in series have resistance values in the ratio 1:1.5:3.3 and combine to an equivalent resistance of 150 ohms. What is the smallest resistor?
An object whose mass is 50lb is projected upward from the surface of the earth with an intial velocity of 200 ft/s. The only force acting on the object is the force of gravity. Determine the max el
Determine the force in member of the loaded truss. Assume that the four external reactions at , and are equal in magnitude and are directed perpendicular to the local supporting surface.
Bone cement used by orthopedic surgeons to set artificial hip implants in place is methyl methacrylate polymerized during the surgery. Surgeons notice a substantial amount of heat evolution from the
If the inner and out radii of the shell are R1 = 5cm, R2 = 6 cm, determine the percentage of the shell's total volume that would be submerged.
Three resistors connected in series have resistance values in the ratio 1:1.5:3.3 and combine to an equivalent resistance of 150 ohms. The are placed across a 300-v DC voltage source. What is the v
If the critical resolved shear stress is 6.2 MPa (900 psi), will an applied stress of 12 MPa (1750 psi) cause the single crystal to yield? If not, what stress will be necessary?
Titanium is stiffer than aluminum, has a lower thermal expansion coefficient than aluminum, and has a higher melting temperature than aluminum. On the same graph, carefully and schematically draw po
Determine the tensile strength of this alloy. Compute the modulus of resilience. What is the ductility, in percent elongation?
During the packaging process, a can of soda of mass 0.4 kg moves down a surface inclined 20 degrees relative to the horizontal. The can is acted upon by a constant force R parallel to the incline (a
What is the maximum load that may be applied to a specimen with a cross-sectional area of 130 mm2 (0.2 in.2) without plastic deformation?
Consider an aorta that has a circular cross section with a diameter of 5mm and a length of 10cm. Assume that the density of blood is 1.06 gm/cm3. Cardiovascular effort/flow units are effort (mmHg) a
If the exit pressure is 200 kPa, and the inlet volumetric flow rate is 100 L/min, then what is the exit temperature? You may assume ideal gas behavior, and neglect changes in kinetic and potential e
Two site are being considered for wind power generation. In the first site, the wind blows steadily at 7 m/s for 3000 hours per year, whereas in the second site the wind blows at 10 m/s for 2000 hou
The exit temperature of the water is 25OC, then what is the exit temperature of the R134a. If still a saturated mixture, what is the exit quality?