What did most Greek philosophers accept as a first principle?
a. Earth was the unmoving center of the Universe.
b. The heavens are imperfect
c. The tetrahedron is the perfect geometric form.
d. There are only six planets in the Universe.
e. Earth travels on an elliptical orbit.
a
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An alpha particle (charge = +2e) is sent at high speed toward a gold nucleus (charge +79e). What is the electrical force acting on the alpha particle when it is at a distance of 2 × 10?14 m away from the gold nucleus? (e = 1.6 × 10?19 C)
What will be an ideal response?
Which of the following statements is true of white dwarfs?
A) Some of them are among the hottest stars known. B) Few of them are positioned in the upper-right corner of the Hertzsprung-Russell (H-R) diagram. C) They have high luminosities. D) They have a very big surface area from which they radiate energy.
Consider a wire in a magnetic field, as shown in the following figure, with a current flowing through it. What will happen to the wire?
a.
The wire will be forced toward the north pole.
b.
The wire will be forced perpendicular to the plane of the magnetic field.
c.
The current will cease flowing.
d.
Nothing will happen.
Fission and fusion reactions have in common _______
a. absorption of energy in the nuclear reaction b. high temperature requirements c. liberation of neutrons d. loss of mass of products over reactants e. gain in mass of products over reactants.