What is exchanged between different particles in order to make the forces work?
A. quarks
B. leptons
C. bosons
D. baryons
E. electrons
Answer: C. bosons
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Which of the following correctly lists the layers of Earth's atmosphere from the ground upward?
A) troposphere, stratosphere, thermosphere, exosphere B) thermosphere, stratosphere, troposphere, exosphere C) exosphere, stratosphere, thermosphere, troposphere D) troposphere, thermosphere, stratosphere, exosphere
Which low-mass star does not have fusion occurring in its central core?
A) a main-sequence star B) a red giant C) a helium-burning star
How is it possible that life cycles of stars are so well understood and tested, even though they can take billions of years to happen?
What will be an ideal response?
A good tutor will be correct in saying that velocity and acceleration are
A) the same concept, but expressed differently. B) rates of one another. C) expressions for changing speeds. D) different concepts.