The moon has an angular diameter of 0.5°. What is the moon's angular diameter in minutes of arc?
a. 0.5
b. 30
c. 50
d. 1800
e. 60.5
B
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Why are white dwarf supernovae more useful than massive star supernovae for measuring cosmic distances?
A) White dwarf supernovae all have roughly the same true peak luminosity, while massive supernovae come in a wide range of peak luminosities. B) We can see only white dwarf supernovae in distant galaxies, not massive star supernovae. C) White dwarf supernovae are much more common than massive star supernovae. D) White dwarf supernovae obey Leavitt's law, while massive supernovae do not.
Atmospheric pressure is 
The pressure of the atmosphere in kPa is
A. 101.3. B. 98.10. C. 75.40. D. 66.70. E. 55.20.
A helium balloon rises because of Archimedes' principle
a. True b. False Indicate whether the statement is true or false
What current in a solenoid 15.0-cm long wound with 100 turns would produce a magnetic field equal to that of the Earth, 5.00 × 10^?5 T?