Suppose that the force of gravity between the sun and Earth suddenly stopped operating. What would happen?
A) Earth would stop in its orbit around the sun, and remain motionless at its present position.
B) Earth would continue orbiting the sun, but objects on Earth would have no weight and would float into space.
C) Earth would fall directly inward, into the sun.
D) Earth would fly directly outward from the sun.
E) Earth would move straight ahead, in a straight line, rather than orbiting the sun.
E
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A quantum of light is called
A) a proton. B) a neutron. C) an electron. D) a neutrino. E) none of the above
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
Supernova 1987A was the first supernova observed by astronomers since Galileo first turned a telescope to the heavens
Indicate whether the statement is true or false
What is the quark structure of a neutron?
a. uud b. udd c. uuu d. ddd e. the question does not make sense