Define the celestial sphere
What will be an ideal response?
An imaginary hollow sphere, with Earth at its center, on which all the stars (and other celestial bodies) are fixed. As the sphere rotates around the Earth, the stars move across our sky.
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Explain why stars form only in molecular clouds, the coldest, densest parts of the interstellar medium
What will be an ideal response?
An electron is moving at
m/s at an angle of 40
to a 0.80 T magnetic field. What is the magnitude of the acceleration of the electron?
A. 
B. 
C. 
D. 
E. 
Which of the following is a main sequence star hotter than the Sun? (Note: the Sun is a G2V star.)
A. O2II B. G1II C. K2V D. G1V E. G2III
An ore car of mass 4 000 kg starts from rest and rolls downhill on tracks from a mine. A spring with k = 400 000 N/m is located at the end of the tracks. At the spring's maximum compression, the car is at an elevation 10 m lower than its elevation at the starting point. How much is the spring compressed in stopping the ore car? Ignore friction