Opposing shearing forces of 3000 N are applied to the 4.00 cm × 5.00 cm faces of a 3.00 cm × 4.00 cm × 5.00 cm steel block. By what amount does the block become slanted? The shear modulus for steel is 8.10 × 1010 N/m2
A) 1.54 × 10-6 m
B) 5.56 × 10-7 m
C) 9.88 × 10-7 m
D) 3.08 × 10-6 m
E) 6.98 × 10-6 m
B
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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 if the temperature distribution on the top surface of the bar varies sinusoidally from 40°C at the left edge to a maximum of 250°C in the center and back to 40°C at the right edge.
GIVEN
Square bar with one surface at fixed temperature, one surface with a specified temperature
distribution, and two surfaces with convective boundary conditions
FIND
(a) Temperature at 9 shown nodes
SKETCH
SAE 50 oil at 70ºF flows through a 2 ft long copper tube of ¼ inch inside diameter. What must the pressure drop be through the tube if 10 lbm/min of oil is flowing through the tube?
What will be an ideal response?
Central black holes can be very efficient for converting the mass-energy of infalling matter to thermal energy in the accretion disk
Roughly what percentage of the mass-energy can be converted to other forms of energy as matter falls into a black hole? A) 0.7% B) 1% - 4% C) 10 - 40% D) 100%
A 340-g air track cart traveling at 1.25 m/s collides elastically with a 300-g cart traveling in the opposite direction at 1.33 m/s. What is the speed of the 300-g cart after the collision?
A) 2.80 m/s B) 0.0693 m/s C) 0.899 m/s D) 1.41 m/s E) 0.475 m/s