Helium originates from
A) stellar nucleosynthesis only.
B) the Big Bang only.
C) mostly from stellar nucleosynthesis with a small contribution from the Big Bang.
D) radioactive decay of elements heavier than carbon.
E) mostly from the Big Bang with a small contribution from stellar nucleosynthesis.
E
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The toughness of a material is:
(a) The strain energy per unit volume needed to fracture the material. (b) The maximum engineering stress. (c) The true stress at fracture. (d) The ductility times the stress at fracture.
Waves on a String: A rope with a total mass of 25.0 kg is tied to a tree on one side of a 125-m wide ravine. You are pulling on the other end of the rope with a force of 415 N. If you pluck the rope at your end, how long will it take the pulse to travel across the ravine to the tree?
Fill in the blank(s) with the appropriate word(s).
Relate synchrotron radiation to the central engine of active galaxies
What will be an ideal response?
An electron is released from rest at the negative plate of a parallel plate capacitor. If the distance between the plates is 5 mm and the potential difference across the plates is 5 V, with what velocity does the electron hit the positive plate? (me = 9.1 × 10^?31 kg, qe = 1.6 × 10^?19 C.)