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What is the value of the acceleration on the surface of a planet that has twice the mass of earth and twice its radius?
Compare the gravitational force of attraction on a 1.0kg object when it is at the surface of the moon to the gravitational force on the same object when it is at the surface of earth.(mass of the moon =7.35 X10^22kg,radius of the moon = 1.78x10^6m,mass off earth = 6x10^24;radius of earth 6.4x10^6m)
- A 2.1 × 103 kg car starts from rest at the top of a driveway that is sloped at an angle of 20.0° with the horizontal. An average friction force of 4.0 × 103 N impedes the car’s motion so that the car’s speed at the bot- tom of the driveway is 3.8 m/s. What is the length of the driveway?
A 4.5 x 107 kg meteor fell and struck the Earth near Flagstaff AZ, leaving a 180 m deep hole. If the meteor was moving at 20,000 m/s upon impact, with what average force did the meteor hit Earth?
An ideal Stirling engine with air as the working fluid operates between specified pressure limits. The heat added to the cycle and the network produced by the cycle is to be determined.
Assumptions: Air is an ideal gas with constant specific heats. Properties: The properties of air at room temperature are R = 0.287 kPa·m3 /kg.K, cp = 1.005 kJ/kg·K, cv = 0.718 kJ/kg·K, and k = 1.4
An ideal Stirling engine with air as the working fluid is considered. The temperature of the source-energy reservoir, the amount of air contained in the engine, and the maximum air pressure during the cycle are to be determined.
Assumptions: Air is an ideal gas with constant specific heats. Properties: The properties of air at room temperature are R = 0.3704 psia·ft3 /lbm.R, cp = 0.240 Btu/lbm·R, cv = 0.171 Btu/lbm·R, and k = 1.4.
An ideal Stirling engine using helium as the working fluid operates between temperature limits of 300 and 2000 K and pressure limits of 150 kPa and 3 MPa. Assuming the mass of the helium used in the cycle is 0.12 kg, determine (a) the thermal efficiency of the cycle, (b) the amount of heat transfer in the regenerator, and (c) the work output per cycle.
An air-standard cycle is executed in a closed system and is composed of the following four processes:
1-2 Isentropic compression from 100 kPa and 27°C to 1 MPa
2-3 P = constant heat addition in the amount of 2800 kJ/kg
3-4 v = constant heat rejection to 100 kPa
4-1 P = constant heat rejection to initial state
(a) Show the cycle on P-v and T-s diagrams.
(b) Calculate the maximum temperature in the cycle.
(c) Determine the thermal efficiency.
Assume constant specific heats at room temperature.
An 800 ft ship has a displacement of 35,000 tons, and the
area defined by the waterline is 38,000 ft2
. Will the ship take
more or less draft when steaming from salt water to fresh water?
How much will it settle or rise?
A bike successfully made a turn around a circular path whose radius is 13.0 m. At what angle is the road banked if its velocity was 12.0 m/s/
