The spring of the pressure gauge shown in the figure has a force constant of 900 N/m, and the piston has a radius of 1.5 cm
As the gauge is lowered into water, what change in depth causes the piston to move in by 0.88 cm? The density of water is 1 000 kg/m3.
a.
1.1 m
b.
0.054 m
c.
76 m
d.
0.017 m
a
You might also like to view...
Which publication was Kepler's masterpiece, providing strong evidence to planetary motion and a heliocentric Universe?
a. Alfonsine Tables b. De Revolutionibus c. Rudolphine Tables d. The Prutenic Tables e. Sidereus Nuncius
A microprocessor chip (10 mm *10 mm square) is to be cooled by an impinging circular air jet that is directed on the chip surface by a 5-mm diameter nozzle, placed at a distance of 10 mm. The electrical activity in the microcircuits of the chip render a uniform surface heat flux condition. For safe operation of the microprocessor, the chip- surface temperature should not exceed 90°C. If air at 20°C flows through the nozzle with a velocity of 10 m/s, and the maximum heat dissipated by the chip is 1.25 W, is this jet- impingement cooling system able to maintain the entire chip surface at a safe operating temperature?
GIVEN
FIND
Whether the jet impinging cooling system be able to maintain the entire chip surface to safe operating
temperature.
Of the following which might NOT vanish over one cycle of a cyclic process?
A. the change in the internal energy of the substance B. the change in pressure of the substance C. the work done by the substance D. the change in the volume of the substance E. the change in the temperature of the substance
A ball is thrown downward from the top of a building with an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high is the building, assuming no air?
A) 20 m B) 30 m C) 50 m D) 70 m