Because of their greater luminosity, RR Lyrae stars can be used at greater distances than can long-period Cepheids
Indicate whether the statement is true or false
FALSE
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A long solenoid (diameter = 5.0 cm) is wound with 960 turns per meter of thin wire through which a current of 300 mA is maintained. A wire carrying 12 A is inserted along the axis of the solenoid. What is the magnitude of the magnetic field at a point 2.0 cm from the axis?
A. 0.41 mT B. 0.48 mT C. 0.38 mT D. 0.56 mT E. 0.24 mT
A hole is punched in a full milk carton, 10 cm below the top. What is the initial velocity of outflow?
A. 1.4 m/s B. 2.0 m/s C. 2.8 m/s D. 3.9 m/s E. 4.2 m/s
What value of B should be used in a velocity selector to separate out 2.0-keV protons if E is fixed at 80 kV/m?
A. 0.18 T B. 0.11 T C. 0.15 T D. 0.13 T E. 0.23 T
We can determine proportions of body fat because:
a. body fat is denser than muscle. b. body fat is less dense than muscle. c. muscle is less dense than water. d. body fat has the same density as water. e. body fat and muscle are both less dense than water.