An archer shoots an arrow. If the action force is the bowstring on the arrow, the reaction is the
A) weight of the arrow.
B) air resistance on the bow.
C) friction of the ground on the archer's feet.
D) grip of the archer's hand on the bow.
E) arrow's push on the bowstring.
Answer: E
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Show that in the limit ?x ? 0, the difference equation for one-dimensional steady conduction with heat generation,is equivalent to the differential equation.
GIVEN • One dimensional steady conduction with heat generation SHOW (a) In the limit of small ?x, the difference equation is equivalent to the differential equation
Gravitational lensing occurs when
A) massive objects bend light beams that are passing nearby. B) massive objects cause more distant objects to appear much larger than they should and we can observe the distant objects with better resolution. C) dark matter builds up in a particular region of space, leading to a very dense region and an extremely high mass-to-light ratio. D) telescope lenses are distorted by gravity.
Suppose you had molecular oxygen (O2 ) chilled enough so that it was in liquid form. Which of the following best describes the phase changes that would occur as you heated the liquid oxygen to high temperature?
A) It would evaporate into a gas, then the molecules would dissociate into individual oxygen atoms, then the atoms would become increasingly ionized as you continued to raise the temperature. B) The liquid molecules would quickly dissociate into a liquid of individual oxygen atoms. These atoms would then evaporate into a gas, and then become ionized to make a plasma. C) It would vaporize into a gas, then the molecules would lose electrons until no electrons were left, then the molecules would dissociate into individual oxygen nuclei. D) The cold temperature would first cause the oxygen to solidify. The solid would then sublimate into a gas, which would then become a plasma as the molecules lost their electrons, until finally it consisted of bonded pairs of oxygen nuclei stripped bare of any electrons.
Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the magnitude of the magnetic field midway between the two wires? (?0 = 4? × 10-7 T ? m/
A) A) 1.0 × 10-5 T B) 2.0 × 10-5 T C) 3.0 × 10-5 T D) 4.0 × 10-5 T E) 5.0 × 10-5 T