Acetone is rubbed on a steel roller, 4 cm in diameter by 40 cm long, to clean it. Air at 25ºC is blown over the roller at 5 m/s. If the density of acetone vapor is 0.778 kg/m^3, estimate the rate of evaporation of acetone into the air. The viscosity of acetone may be taken as 0.01 g/m?s.
What will be an ideal response?
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If you think of a battery as an electric charge ‘pump,' the battery voltage is analogous to
a. rate of fluid flow. b. pressure. c. flow velocity. d. water. e. none of the above.
During a snowball fight two balls with masses of 0.30 and 0.70 kg, respectively, are thrown in such a manner that they meet head-on and combine to form a single mass. The magnitude of initial velocity for each is 12.0 m/s. What is the speed of the 1.0-kg mass immediately after collision?
a. zero b. 4.8 m/s c. 12 m/s d. 8.4 m/s e. 3.6 m/s
Power: A series circuit has a 100-? resistor, 2.00-mH inductor and a 4.00-?F capacitor connected across a 120-V rms ac source at 1000/? Hz. What is the power dissipated by the circuit?
A. 184 W B. 18.6 W C. 58.4 W D. 91.8 W E. 180 W
Describe how we know that the expansion rate of the Universe is currently accelerating
What will be an ideal response?