6.91 A handheld pump for a bicycle (Fig. P6.91) has a volume of 25 cm³ when fully extended. You now press the plunger (piston) in while holding your thumb over the exit hole so that an air pressure of 300 kPa is obtained. The outside atmosphere is at Po, To. Consider two cases: (1) it is done quickly (~1 s), and (2) it is done very slowly (~1 h). a. State the assumptions about the process for each case. b. Find the final volume and temperature for both cases. FIGURE P6.91

6.91 A handheld pump for a bicycle (Fig. P6.91) has a volume of 25 cm³ when fully extended. You now press the plunger (piston) in while holding your thumb over the exit hole so that an air pressure of 300 kPa is obtained. The outside atmosphere is at Po, To. Consider two cases: (1) it is done quickly (~1 s), and (2) it is done very slowly (~1 h). a. State the assumptions about the process for each case. b. Find the final volume and temperature for both cases. FIGURE P6.91

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

The inlet section of a vacuum cleaner is a rectangle 1 in x 5 in.The blower is able to provide suction at 25 ft3/min. Assuming theair density is 1.2 kg/m3, what is the mass flow of air in kg/s?
You wish to water your garden with 100 ft of 5/8-in-diameterhose whose roughness is 0.011 in. What will be the delivery,in ft3/s, if the gage pressure at the faucet is 60 lbf/in2?If there is no nozzle (just an open hose exit), what is thethe maximum horizontal distance the exit jet will carry?
In Fig. P3.137 the piston drives water at 20 ° C. Neglectinglosses, estimate the exit velocity V 2 ft/s. If D 2 is furtherconstricted, what is the limiting possible value of V 2 ?
A fi reboat draws seawater (SG = 1.025) from a submergedpipe and discharges it through a nozzle, as in Fig. P3.176.The total head loss is 6.5 ft. If the pump efficiency is75 percent, what horsepower motor is required to drive it?
A typical pump has a head that, for a given shaft rotationrate, varies with the fl ow rate, resulting in a pump performancecurve as in Fig. P3.181. Suppose that this pump is75 percent efficient and is used for the system in Prob.3.180. Estimate ( a ) the flow rate, in gal/min, and ( b ) thehorsepower needed to drive the pump.
An 8-in model pump delivering 180°F water at 800 gal/minand 2400 r/min begins to cavitate when the inlet pressureand velocity are 12 lbf/in2 absolute and 20 ft/s, respectively.Find the required NPSH of a prototype that is4 times larger and runs at 1000 r/min.
Water at 20 ° C flows steadily through a reducing pipe bend,as in Fig. P3.77. Known conditions are p 1 = 350 kPa, D 1 =25 cm, V 1= 2.2 m/s, p 2 = 120 kPa, and D 2 = 8 cm.Neglecting bend and water weight, estimate the total forcethat must be resisted by the flange bolts.
A 20 °C water jet strikes a vane mounted on a tank withfrictionless wheels, as in Fig. P3.61. The jet turns and fallsinto the tank without spilling out. If θ =30 ° , evaluate thehorizontal force F required to hold the tank stationary.
When the pump in Fig. P3.169 draws 220 m 3 /h of water at20 ° C from the reservoir, the total friction head loss is 5 m.The flow discharges through a nozzle to the atmosphere.Estimate the pump power in kW delivered to the water.
For a tank, calculate the volumetric flow of water, which comes out through a pipe, the tank is sealed, the depth is h1=2M, Qexit=0.05,substance water Vexit=? and Q=?.
A uniform water stream, U∞ = 20 m/s and ρ = 998 kg/m3,combines with a source at the origin to form a half-body. At(x, y) = (0, 1.2 m), the pressure is 12.5 kPa less than p∞. (a) Isthis point outside the body? Estimate (b) the appropriatesource strength m and (c) the pressure at the nose of the body.
Suppose that the axial-flow pump of Fig. with D =18 in, runs at 1800 r/min. (a) Could it efficiently pump25,000 gal/min of water? (b) If so, what head would result?(c) If a head of 120 ft is desired, what values of D and nwould be better?