Answer the following statement(s) true (T) or false (F)
1. At time t = 0 a person is sliding due east on a flat, frictionless plane of ice. The net force on this person is due to a battery-powered fan the person holds that exerts a southward thrust force on the person. Assuming that drag is negligible, the eastward component of the person’s velocity is unaffected by this force.
1. TRUE
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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
The reason the rings of Saturn exist is because:
A) the ring material lies within the Roche limit of Saturn. B) the gravitational influence of Titan confines them to those orbits. C) the eruptions of Mimas' volcanoes are keeping them supplied with ice. D) there has not been sufficient time for the ring particles to form a moon. E) Saturn's rapid rotation is spinning material away from its equator, out into space.
In general, the more massive the star, the ________ its lifetime
Fill in the blank(s) with correct word
Tycho Brahe's greatest contribution to astronomy was
a. his model of the universe. b. his telescopic observations. c. his discovery of three laws of motion. d. his 20 years of careful observations of the planets. e. a and b above