The observation that materials expand in size with an increase in temperature can be applied to what proportion of existing substances?
a. 100%
b. most
c. few
d. none
b
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The presence of granulation is clear evidence that energy is flowing upward through the photosphere by a process known as__________
A) convection B) ionization C) blueshift D) polarization
A velocity selector uses a fixed electric field of magnitude E and the magnetic field is varied to select particles of various energies. If a magnetic field of magnitude B is used to select a particle of a certain energy and mass, what magnitude of magnetic field is needed to select a particle of equal mass but twice the energy?
a. 0.50 B b. 1.4 B c. 2.0 B d. 0.71 B e. 1.7 B
Which of the following objects can’t be accelerating?
1.an object moving with a constant speed 2.an object moving with a constant velocity 3.an object moving with along a curve
When the midpoint of the face of the Sun appears to be on the horizon, where is the actual midpoint from the point of view of the observer?
a. above the horizon at sunrise and below the horizon at sunset b. on the horizon c. below the horizon d. above the horizon