Engineering, 13.04.2021 03:50 Itssata

When the pump handle is fully-extended, the cylinder of a hand-held bike pump has a volume of 2.0 in3 . If a person holds their thumb over the exit hole (no needles!) and push on the pump handle to compress the air you can increase the pressure in the cylinder. Let us presume that a pressure of 45 lbf/in2 is obtained. Atmospheric pressure is 14.7 psi and the outside temperature is 100 degF. Required:
a. Determine the final volume and the final temperature of the gas if the process is done slowly (about 1 hour)
b. Determine the final volume and the final temperature of the gas if the process is done quickly (about 1 second)
c. Be certain to identify and list any assumptions that are needed to answer these questions

Answers: 3

Show answers

Another question on Engineering

Engineering, 04.07.2019 18:10

An air conditioning system consist of a 5 cm diameter pipe, operating at a pressure of 200 kpa. the air initially enters the pipe at 15°c with a velocity of 20 m/s and relative humidity of 80%. if the heat supply throughout the process is 960 w, determine the relative humidity and the temperature at the outlet

Answers: 3

Answer

Engineering, 04.07.2019 18:10

Hydraulic fluid with a sg. of 0.78 is flowing through a 1.5 in. i.d. pipe at 58 gal/min. the fluid has an absolute viscosity of 11.8 x 105 lbf-sec/ft2. is the flow laminar, turbulent or within the critical range? give both a numerical reynolds number and a term answer.

Answers: 3

Answer

Engineering, 04.07.2019 18:20

Air flows over a heated plate àt a velocity of 50m/s. the local skin factor coefficient at a point on a plate is 0.004. estimate the local heat transfer coefficient at this point.the following property data for air are given: density = 0.88kg/m3 , viscosity 2.286 x 10 ^-5 kgm/s , k = 0.035w/mk ,cp = 1.001kj/kgk. use colburn reynolds analogy.

Answers: 1

Answer

Engineering, 04.07.2019 19:20

At steady state, air at 200 kpa, 325 k, and mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross-sectional areas. the inlet cross-sectional area is 6 cm2. at the duct exit, the pressure of the air is 100 kpa and the velocity is 250 m/s. neglecting potential energy effects and modeling air as an 1.008 kj/kg k, determine ideal gas with constant cp = (a) the velocity of the air at the inlet, in m/s. (b) the temperature of the air at the exit, in k. (c) the exit cross-sectional area, in cm2

Answers: 2

Answer

You know the right answer?

When the pump handle is fully-extended, the cylinder of a hand-held bike pump has a volume of 2.0 in...

Questions