As an incompressible fluid in a pipe flows past a region where the pipe gets narrower:
a. the fluid flows faster.
b. the fluid flows more slowly.
c. the speed of the fluid remains the same.
d. the number of gallons of fluid per second increases.
e. the number of gallons of fluid per second remains the same.
a
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A 2.00 kg pendulum bob on a string 1.50 m long, is released with a velocity of 3.00 m/s when the support string makes an angle of 45.0 degrees with the vertical. What is the angle with the vertical the bob makes at the highest point of its motion?
A. 47.5 degrees B. 50.0 degrees C. 59.8 degrees D. 66.4 degrees E. 75.3 degrees
Two metal rods, one silver and the other copper, are both attached to a steam chamber as shown in the figure, with a temperature of 100°C, at one end, and an ice water bath, with a temperature of 0°C, at the other
The rods are 5.0 cm long and have a square cross-section, 2.0 cm on a side. When steady state has been reached, how much heat flows through the two rods in 1.0 min? The thermal conductivity of silver is 417 W/(m ? K), and that of copper is 395 W/(m ? K). No heat is exchanged between the rods and the surroundings, except at their ends. A) 20 kJ B) 39 kJ C) 47 kJ D) 49 kJ E) 11 kJ
When a star collapses to form a black hole, its mass
A) increases. B) decreases. C) remains the same.
Observatory construction sites: Consider the factors that go into selecting telescope construction sites
What type of site would you look for to build a large visible-light observatory? Where would you want to build an X-ray telescope? Would these be the same or different, and why?