Without the strong nuclear force, the only element in the universe would be ________. Explain
Fill in the blank(s) with correct word
hydrogen. The strong force allows protons to fuse and create helium and heavier elements; without it, all would be hydrogen.
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When we see a binary system producing eclipses, we know that the orbit is nearly edge-on
Indicate whether the statement is true or false
A pilot executes a vertical dive. Just before the plane starts to come up from the bottom of the dive, the force on him is
A) more than g, and pointing down. B) less than g, and pointing up. C) more than g, and pointing up. D) less than g, and pointing down. E) equal to g, and pointing down.
If the Hubble constant is 25 km/s per million light-years, use it to estimate the age of the universe? (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s)
A) 15 Gy B) 10 Gy C) 20 Gy D) 12 Gy E) 25 Gy
What happens after the helium flash in the core of a star?
A) The core quickly heats up and expands as helium fusion begins all at once throughout the core. B) The star breaks apart in a violent explosion. C) The core suddenly contracts because the helium disappears after being fused. D) The core stops fusing helium. E) The star starts to fuse helium in a shell outside the core.