The dark age started as the first stars began to form
Indicate whether the statement is true or false
False
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Two masses are suspended by a cord that passes over a pulley with negligible mass. The cord also has negligible mass. One of the masses, 
has a mass of 7.0 kg and the other mass, 
has a mass of 3.0 kg. The pulley turns on a shaft through the center of the pulley and supports the pulley and all the masses. The vertical force of the shaft on the pulley that supports the whole system is
A. 49 N upward.
B. 49 N downward.
C. 82 N upward.
D. 82 N downward.
E. 98 N upward.
The Sun's surface, as we see it with our eyes, is called the
A) chromosphere. B) photosphere. C) corona. D) core.
An electron is accelerated from rest through a potential difference of 3750 V. It enters a region where the magnetic field is 4.0 mT perpendicular to the velocity of the electron. Calculate the radius of the path this electron will follow
A) 1.2 cm B) 2.2 cm C) 3.2 cm D) 4.2 cm E) 5.2 cm
Luminous (normal) matter makes up approximately what percentage of the known matter in the universe?
A) 15% B) 5% C) 60% D) 95%