My 5.0 hp mower would be equivalent to an electric mower rated at what power?
A) 2.8 W
B) 0.25 KW
C) 2.8 KW
D) 3.7 KW
E) 0.78 KW
D
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In a long, 30-cm square bar shown in the accompanying sketch, the left face is maintained at 40°C and the top face is maintained at 250°C. The right face is in contact with a fluid at 40°C through a heat transfer coefficient of 60 W/(m2 K) and the bottom face is in contact with a fluid at 250°C through a heat transfer coefficient of 100 W/(m2 K). If the thermal conductivity of the bar is 20 W/(mK), calculate the temperature at the 9 nodes shown in the sketch.
GIVEN
• Square bar with two surfaces at fixed temperature and two surfaces with convective boundary conditions
FIND (a) Temperature at 9 shown nodes
SKETCH
Consider a string with several rocks tied along its length at equally spaced intervals. You whirl the string overhead so that the rocks follow circular paths. Compared with a rock at the end of the string, a rock at the middle moves
A) half as fast. B) twice as fast. C) at the same linear speed.
Uranus and Neptune are very similar in size and mass
Indicate whether the statement is true or false
An observer's nadir is
a. the point directly opposite the observer's zenith. b. the north point on the observer's horizon. c. located at the center of Earth. d. always located near a circumpolar constellation. e. directly opposite the north celestial pole.