The pascal is a pressure unit equal to
A) 1 newton per square meter.
B) 1 kilogram per square meter.
C) 1 newton per square centimeter.
D) 1 kilogram per square centimeter.
Answer: A
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Which of the following is true regarding the two types of flames?
A solar eclipse can only occur when the Moon is ____
a. full b. new c. waning d. waxing e. rising
Mercury flows inside a copper tube 9 m long with a 5.1 cm inside diameter at an average velocity of 7 m/s. The temperature at the inside surface of the tube is 38°C uniformly throughout the tube, and the arithmetic mean bulk temperature of the mercury is 66°C. Assuming the velocity and temperature profiles are fully developed, calculate the rate of heat transfer by convection for the 9 m length by considering the mercury as (a) an ordinary liquid and (b) liquid metal. Compare the results.
GIVEN
FIND
The rate of heat transfer for the 9 m length considering mercury as
(a) an ordinary liquid, and
(b) a liquid metal
ASSUMPTIONS
Steady state
Fully developed flow
SKETCH
PROPERTIES AND CONSTANTS
for mercury at the bulk temperature of 66°C
For a plane to be able to fly clockwise in a horizontal circle as seen from above, in addition to exerting a force downwards on the air
a. it must be increasing its speed. b. it must exert a force on the air that is directed to the plane's left side. c. it must exert a force on the air that is directed to the plane's right side. d. it does not need to exert a force: it must only move the wing flaps out. e. it only needs to deflect the air without exerting any additional force on the air.