A ball with a diameter of 10.0 cm is submerged in water. The buoyant force of the water on the ball is
A. 4.25 N.
B. 4.75 N.
C. 5.13 N.
D. 5.75 N.
E. 6.00 N.
C. 5.13 N.
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Briefly explain the atmosphere on Mars
What will be an ideal response?
Both protons and neutrons (and their anti-particles) froze out:
A) after 10-43 seconds, at the Planck Era. B) at 1032 K, at the end of the Inflationary Era. C) at 1013 K, about .0001 seconds after the Big Bang. D) after about a minute of expansion. E) about 50,000 years after the Big Bang.
An interpretation of the photoelectric effect is that:
1.Light is emitted only when electrons change orbits. 2.Light has a wavelike character. 3.Light is absorbed in quanta of energy E = h? 4.Electrons have an associated wave having wavelength ? = h/p. 5.Photons must have some minimum energy to penetrate a material. 6.More than one of the above
What does temperature measure?
A) the average mass of particles in a substance B) the average size of particles in a substance C) the average kinetic energy of particles in a substance D) the total number of particles in a substance E) the total potential energy of particles in a substance