Which statement is correct about the relationship between the average speed and the magnitude of the average velocity for any motion?
A) The average speed is always one-half the magnitude of the average velocity.
B) The average speed is always greater than or equal to the magnitude of the average velocity.
C) The average speed can be less than, greater than or equal to the magnitude of the average velocity.
D) The average speed is always less than or equal to the magnitude of the average velocity.
E) The average speed is always equal to the magnitude of the average velocity.
B
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Generation of photochemical smog involves the reaction of unburned hydrocarbons with sunlight in a closed basin
What will be an ideal response?
A solid sphere, solid cylinder, and a hollow pipe all have equal masses and radii. If the three are released simultaneously at the top of an inclined plane, and roll without slipping which will reach the bottom first?
A) sphere B) pipe C) cylinder D) they all reach bottom in the same time E) It depends on the angle of inclination.
Evaluate the dimensionless groups hcD/k, U? Dp/?, cp ?/k for water, n-Butyl alcohol, mercury, hydrogen, air, and saturated steam at a temperature of 100°C. Let D = 1 m, U? = 1 m/sec, and hc = 1 W/(m2 K).
GIVEN
D = 1 m
U? = 1 m/s
hc = 1 W/(m2 K)
FIND
The dimensionless groups
? hc D/k (Nusselt number)
? U? D p/? (Reynolds number)
? cp ?/k (Prandtl number)
PROPERTIES AND CONSTANTS
From Appendix 2, at 100°C
4.4 × 10^6 divided by 8.8 × 10^10 is equal to
a. 5.0 × 10^?5. b. 5.0 × 10^?4. c. 5.0 × 10^4. d. 3.9 × 10^17. e. 3.9 × 10^16.