A heater draws 20A when connected to a 110-V line. If the electric power costs 20 cents per kilowatt hour, the cost of running the heater for 10 hours is
A) $0.44.
B) $1.10.
C) $4.40.
D) $11.00.
E) none of the above
Answer: C
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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
Astronomers measured the location of the Sun in the Milky Way Galaxy by
A. counting the number of stars. B. plotting the position of O and B stars. C. plotting the position of globular star clusters. D. plotting distribution of water molecules.
CH3 CONHCH2 CH3 is an example of a(n)
a. amide. b. amine. c. ester. d. carboxylic acid.
An apple weighing 3 newtons hangs, motionless, from a tree branch. What are the forces by the environment that act on this apple?
A) There are no forces by the environment on a motionless apple. B) The apple's weight and the apple's downward pull on the branch. C) Only the apple's weight. D) Only the upward lift of the branch. E) the apple's weight and the branch's upward lift on the apple.