If you walk toward a mirror at a certain speed, the relative speed between you and your image is
A) half your speed.
B) your speed.
C) twice your speed.
D) none of the above
Answer: C
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Two point charges of +2.0 ?C and -6.0 ?C are located on the x-axis at x = -1.0 cm and x = +2.0 cm respectively
Where should a third charge of +3.0-?C be placed on the +x-axis so that the potential at the origin is equal to zero? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) A) x = 4.0 cm B) x = 1.0 cm C) x = 2.0 cm D) x = 3.0 cm E) x = 5.0 cm
How did ancient peoples of central Africa predict the weather?
What will be an ideal response?
What part of the Sun's aging process will disrupt the biosphere and evaporate the oceans of Earth?
a. the fusion of hydrogen in the core b. an increase in luminosity as the core becomes helium-enriched c. the expansion of the outer layers of the Sun as a red giant d. the supernova explosion caused by the collapse of the iron core e. hydrogen detonation on the white dwarf remnant
What is the most accurate way to determine the distance to a nearby galaxy?
A) stellar parallax B) radar ranging C) Hubble's law D) main sequence fitting E) Cepheid variables