The strength of a beam is most related to its
A) cross section.
B) length.
C) both of these
Answer: A
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How have astronomers measured the acceleration of the universe?
A) by measuring changes in galaxies' redshifts from year to year B) by comparing lookback times for white-dwarf supernovae (by measuring their apparent brightness) with the average distance between galaxies (based on their cosmological redshifts) C) They have not. It is a purely hypothetical idea.
Projectile Motion: A hunter points a rifle horizontally and holds it 3.30 m above the ground. The bullet leaves the barrel at 325 m/s and experiences no significant air resistance. The acceleration due to gravity at this location is 9.80 m/s2.(a) How long does it take for the bullet to strike the ground?(b) How far horizontally does it travel?
What will be an ideal response?
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Answer the following statement true (T) or false (F)
During a reaction, an element loses 4.8 × 10-28 kg of mass. How much energy (in Joules) is released?
A) 4.3 × 10-11 J B) 1.4 × 10-19 J C) 1.6 × 10-36 J D) 2.1 × 10-40 J E) 5.3 × 10-45 J