A planetary nebula is an example of a star no longer in hydrostatic equilibrium
a. True
b. False
Indicate whether the statement is true or false
True
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A copper tube with wall thickness of 8 mm must carry an axial ten-sile force of 175 kN. The allowable tensile stress is 90 MPa. The minimum required outer diameter is approximately:
(A) 60 mm
(B) 72 mm
(C) 85 mm
(D) 93 mm
A 3.00 kg pendulum bob on a string 2.00 m long is released with a velocity of 2.00 m/s when the support string makes an angle of 45.0 degrees with the vertical. What is the tension in the string at the highest point of its motion?
A. 12.5 N B. 17.8 N C. 21.4 N D. 28.9 N E. 31.6 N
What are the primary reasons for making telescopes larger?
a. to make things look bigger b. to decrease image resolution c. to collect more light to so faint objects can be seen d. to see a larger part of the sky
You're in a fast-moving train traveling at constant velocity. If you jump straight up you land
A) slightly ahead of your original position. B) at your original position. C) slightly behind your original position.