According to our modern science, which of the following best explains why the vast majority of the mass of our solar system consists of hydrogen and helium gas?
A) Hydrogen and helium are the most common elements throughout the universe, because they were the only elements present when the universe was young.
B) Hydrogen and helium are produced in stars by nuclear fusion.
C) All the other elements escaped from the solar nebula before the Sun and planets formed.
D) All the other elements were swept out of the solar system by the solar wind.
A
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A conducting rod slides at 4.0 m/s on metal rails separated by 2.0 m. If a current of 40 mA is generated in the circuit with resistance of 0.36 
what is the magnetic field between the rails?
A. 0.028 T
B. 0.11 T
C. 14 mT
D. 3.6 mT
E. 1.8 mT
The ideal gas model assumes that molecules have infinitesimal size. Consider one molecule bouncing around in the container. As the molecule’s size increases relative to the size of the container, how will the average pressure P that it exerts change, other things being held constant?
A. P increases. B. P does not change. C. P decreases. D. One does not have enough information to say.
The least important power of a telescope is _____
A) magnifying power B) light-gathering power C) resolving power D) reflecting power
A block is on a frictionless horizontal table, on earth. This block accelerates at 3.6 m/s2 when a 90 N horizontal force is applied to it. The block and table are then set up on the moon where the acceleration due to gravity is 1.62 m/s2
A horizontal force of 45 N is applied to the block when it is on the moon. What acceleration does this force impart to the block? A) 1.8 m/s2 B) 1.6 m/s2 C) 2.0 m/s2 D) 2.2 m/s2 E) 2.3 m/s2