A ball is thrown straight upward from ground level with a speed of 18 m/s. How much time passes before the ball strikes the ground if we disregard air resistance?
A) 3.7 s
B) 1.8 s
C) 1.1 s
D) 0.6 s
A
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Radioactive Decay: The decay constant of a radioactive nuclide is 3.1 × 10-3 s-1. At a given instant, the activity of a specimen of the nuclide is 70 kBq. How much later has the activity declined to 10 kBq?
A. 630 s B. 690 s C. 750 s D. 820 s E. 880 s
Deuterium is much more abundant on Venus than Earth. What do scientists think this fact tells us about Venus?
A) that Venus has lost a tremendous amount of water as a result of molecules being split by ultraviolet light and the hydrogen escaping to space B) that Venus once had a much stronger magnetic field than it does today C) that the greenhouse effect on Venus must have been much weaker in the distant past D) that volcanoes on Venus did not outgas as much water as volcanoes on Earth
A(n) ________ spiral galaxy has a very bright active nucleus with violent motions in the interstellar gas
Fill in the blank(s) with correct word
Which force is strongest within an atomic nucleus?
A) strong B) weak C) electromagnetic D) gravity E) They are all equal.