If pressure inside a cylinder with a circular hatch is 2 atm and the radius of the entrance hatch is 12 inches, what force does the air exert on the hatch? Recall that the area of a circle is ?r2
a. 24 lb b. 288 lb
c. 904.8 lb d. 1,300.6 lb
e. 13,300.6 lb
e
RATIONALE: P = 2 atm = 2 × 14.7 psi and A = ?r2 = 3.1416 × 144 in2 . F=PA
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Determine the temperature at the four nodes shown in the sketch. Assume steady conditions and two-dimensional heat conduction. The four faces of the square shape are each at different temperatures as shown.
GIVEN
Square shape with four different face temperatures
FIND
Temperature at four interior nodes
SKETCH
Carnot Engine: An ideal Carnot engine operates between a warm reservoir at 233 K and a colder reservoir. During each cycle, this engine extracts 15.0 J of heat from the warm reservoir and does 4.0 J of work. What is the temperature of the colder reservoir?
A. 171 K B. 62 K C. 47 K D. 67 K
How could you test the hypothesis that the acceleration of gravity does not depend on mass? (Ignore effects of air resistance.)
A) Drop two objects with the same mass from the same height. B) Drop two objects with the same mass from different heights. C) Drop two objects with different masses from the same height. D) Drop two objects with different masses from different heights.
The smallest amount of a fissionable material that will give a self-sustaining chain reaction is called the
a. mass defect. b. mass number. c. atomic mass. d. critical mass.