The source of energy that keeps the Sun shining today is
A) nuclear fission.
B) nuclear fusion.
C) gravitational contraction.
D) chemical reactions.
B) nuclear fusion.
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To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the time is 2.3 s, what is the height of the bridge? Neglect air resistance
A) 32 m B) 52 m C) 10 m D) 14 m E) 26 m
How many carbon and hydrogen atoms are there in the unit cell of polyethylene shown in Figure 2.21c, assuming that the density of crystalline polyethylene is 0.996 g/cm3 ?
What will be an ideal response?
What does better angular resolution mean?
a. astronomical objects look larger b. astronomical objects look smaller c. you can see more detail in images d. you can see fainter objects e. none of the above
How does the declination of the Sun vary over 1 year?