In the hypothetical atomic interaction shown in figure C9.13, assume that initially the atoms have a total energy of 3 × 10-21 J at r = 0.1 nm. These atoms are
A. Unbound (they will separate to infinity).
B. Bound (they will not separate to infinity).
C. The answer depends on whether the atoms are initially moving toward or away from each other.
B. Bound (they will not separate to infinity).
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Cosmic rays penetrate your body when
A) safely in your home. B) outdoors. C) in mountainous regions. D) all of the above E) none of the above
A ball is thrown straight up and returns to its starting point under an acceleration due to gravity. Which of the following is true?
A) It took less time to rise than to fall. B) To compare rise and fall times we need to know the mass of the ball. C) It took the same time to rise as it took to fall. D) It took longer to rise than to fall.
A person is dragging a packing crate of mass 100 kg across a rough horizontal floor where the coefficient of kinetic friction is 0.400. He exerts a force F sufficient to accelerate the crate forward
At what angle above horizontal should his pulling force be directed in order to achieve the maximum acceleration? A) 21.8° B) 27.7° C) 30° D) 34.5° E) 45°
A very long straight wire carries a 12-A current eastward and a second very long straight wire carries a 14-A current westward. The wires are parallel to each other and are 42 cm apart. Calculate the force on a 6.4 m length of one of the wires
(?0 = 4? × 10-7 T ? m/A) A) 5.1 × 10-4 N B) 2.2 × 10-4 N C) 5.1 × 10-6 N D) 8.0 × 10-5 N E) 8.0 × 10-7 N