A barbell is easier to twist when its weights are
a. close to the axis of rotation.
b. near the ends of the bar.
c. heavy.
d. light.
e. none of the above.
a, d
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In a condenser of a refrigeration unit, saturated vapor R-134a flows at 0.5 m/s into a 0.5 cm diameter horizontal tube. The tube inside surface temperature is 30ºC and the R- 134a is at 80ºC. Estimate the convective heat transfer coefficient and the expected tube length required for complete condensation of the R-134a. Use hnfg of 106.3 kJ/kg, ?f of 927.6 kg/m3, ?g of 153.8 kg/m3, and cp, ?, and ? at 400C.
What will be an ideal response?
A wheel rotates about a fixed axis with an initial angular velocity of 20 rad/s. During a 5.0-s interval the angular velocity decreases to 10 rad/s. Assume that the angular acceleration is constant during the 5.0-s interval. How many radians does the wheel turn through during the 5.0-s interval?
a. 95 rad b. 85 rad c. 65 rad d. 75 rad e. 125 rad
The 500-m-long spaceship Springbrake is at rest on the planet Hitest for refueling. Another spaceship, Summerbrake, passes parallel to Springbrake at 0.600c. The crew on Springbrake measure the length of Summerbrake as it passes and find that the length they measure is exactly the same as the known 500-m rest length of Springbrake. If Summerbrake were at rest next to Springbrake, its length would
then be measured to be a. 180 m. b. 320 m. c. 500 m. d. 625 m. e. 781 m.
What is the highest energy of a photon in the Balmer series?
A. 1.89 eV B. 3.40 eV C. 1.51 eV D. 0.94 eV E. 0.66 eV