Equilibrium: An object is being acted upon by three forces and moves with a constant velocity. One force is 60 N along the +x-axis, the second is 75 N along a direction making a counterclockwise angle of 150° with the +x-axis.(a) What is the magnitude of the third force?(b) What is the direction of the third force, measured clockwise from the +x-axis?
Fill in the blank(s) with the appropriate word(s).
(a) 38 N (b) 260°
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Matter swirling into a compact object forms a(n) _______________ disk
Fill in the blank(s) with correct word
What kinds of stars are being looked at to find these hiding bandits?
A: Stars with small parallaxes B: Stars with large parallaxes C: Stars with temperatures much greater than the Sun D: Stars with radii much greater than the Sun E: Stars with radii much smaller than the Sun
When an object is at rest, and stays at rest, it might have several forces acting on it. However,
A. the forces are all in the same direction. B. there can only be one force opposite gravity, since weight depends on mass. C. dynamic equilibrium can never be achieved except in the total absence of all forces. D. the forces balance out to net force of zero.
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
