It is believed that ring galaxies form
a. when two galaxies collide nearly head on at high speed.
b. when two spiral galaxies collide, but not directly head on.
c. from a large cloud of gas and dust with very little angular momentum.
d. from a large cloud of gas and dust with a very high angular momentum.
e. when more than two galaxies collide at the same time.
A
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An incompressible fluid is flowing through a horizontal pipe with a constriction. The velocity of the fluid in the wide section of the pipe is 6.00 m/s and the velocity of the fluid in the narrow section of pipe is 8.00 m/s. The pressure of the fluid in the wide section is 250 kPa. What is the pressure in the narrow section of the pipe? (density of the fluid is 1000 
A. 183 kPa B. 236 kPa C. 268 kPa D. 285 kPa E. 298 kPa
Two cylinders are in contact along an inclined plane. The upper cylinder (weight is 2.5W) rests against the lower cylinder (weight W), and both are supported by a wall where the contact force is N1. Assume that all friction forces are negligible. An expression for contact force N1 in terms of load variable W is:
(A) 1.75W
(B) 3.5W
(C) 1.57W
(D) 2.01W
Why are the temperature fluctuations observed in the cosmic microwave background are important?
What will be an ideal response?
A solid cylindrical bar conducts heat at a rate of 25 W from a hot to a cold reservoir under steady state conditions
If both the length and the diameter of this bar are doubled, the rate at which it will conduct heat between these reservoirs will be A) 200 W B) 100 W C) 50 W D) 25 W E) 12.5 W