How long does it take an M class star to reach the main sequence, compared to a solar type star?
A) a tenth as long
B) about the same, 30 million years
C) about twice as long
D) about twenty times longer
E) longer than the age of the Galaxy
D
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An object travels halfway around a circle at a constant instantaneous speed 
.What is the magnitude 
of its average velocity during this time interval?
A. 
B. 1.41
C. 1.57
D./1.41
E. /1.57
Which of these is NOT a function of a calendar?
A. Be useful to a large number of people for communication regarding dates. B. Use natural time intervals such as those defined by the Moon. C. Be able to accurately predict when an asteroid will strike the Earth. D. Keeps track of time over long periods.
Mathilda collects photoelectric data in her physics laboratory
She measures a stopping potential of 5.82 volts for radiation of wavelength 100. nm, and 17.99 volts stops 50.0 nm. (a) What is the work function for the material in eV? (b) From her data one determines Planck's constant to be what?
In a battery circuit with different resistors in parallel,
a. the total resistance is larger than the value of the largest resistor. b. the current is the same through each resistor. c. the total resistance is larger than the value of the smallest resistor. d. the voltage is the same across each resistor.