An expandable container holds 2.30 mole of He gas with an initial pressure of 770 kPa and an initial volume of 2.10 L. The gas expands isothermally to a final pressure of 350 kPa. How much heat is gained by the gas in this process?
A) 1280 J
B) 792 J
C) 685 J
D) 1370 J
E) 1700 J
A
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Determine the heat transfer coefficient for liquid bismuth flowing through an annulus (5-cm-ID, 6.1-cm-OD) at a velocity of 4.5 m/s. The wall temperature of the inner surface is 427°C and the bismuth is at 316°C. It may be assumed that heat losses from the outer surface are negligible.
GIVEN
FIND
The heat transfer coefficient
ASSUMPTIONS
Steady state
Heat losses from outer surfaces are negligible
SKETCH
PROPERTIES AND CONSTANTS
for bismuth at the bulk temperature of 316°C
A ball rolls over the edge of a table with a horizontal velocity v m/s. The height of the table is 1.6 m and the horizontal range of the ball from the base of the table is 20 m
What is the horizontal velocity of the ball just before it touches the ground? A) 35 m/s B) 9.8 m/s C) 20 m/s D) 4.9 m/s E) 70 m/s
A particular material has an index of refraction of 1.25 . What percent of the speed of light in a vacuum is the speed of light in the material?
A student kicks a soccer ball in a high arc toward the opponent's goal. At the highest point in its trajectory:
A) both velocity and acceleration of the soccer ball are zero. B) neither the ball's velocity nor its acceleration is zero. C) the ball's acceleration is zero but not its velocity. D) the ball's acceleration points upwards. E) the ball's velocity points downwards.