Energy released by the Sun results from the process wherein atomic nuclei
A) break apart.
B) combine.
C) both of these
D) neither of these
Answer: B
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A satellite that is in a circular orbit 230 km above the surface of the planet Zeeman-474 has an orbital period of 89 min. The radius of Zeeman-474 is 6.38 × 106 m. What is the mass of this planet? (G = 6.67 × 10-11 N ? m2/kg2)
A) 5.0 × 1024 kg B) 5.5 × 1024 kg C) 6.0 × 1024 kg D) 6.5 × 1024 kg
If one waits for a time equal to two half-lives for a certain radioactive material, all of it originally present will have decayed completely.A
Indicate whether the statement is true or false
Because of the equivalence of mass and energy, an electron and a positron, which are two massive particles, can annihilate when they come together to produce two photons, which have no mass
Indicate whether the statement is true or false
The weight of the barrel on the slope is shown by the vector which has components (not shown) parallel to the surface of the incline and perpendicular to the surface of the incline
Judging from the slope of incline, the greater of these two components is 1) parallel to the slope. 2) perpendicular to the slope. 3) both the same. 4) need more information If the slope of the incline were steeper, this component vector would 5) decrease. 6) remain the same. 7) increase. 8) again, can't really say.