The internal energy of a substance can be increased by
a. doing work on it.
b. letting it do work.
c. adding heat to it.
d. extracting heat from it.
e. none of the above.
a, c
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Astronomers have defined a(n) _______________ around a star as a region within which planets that orbit there have temperatures permitting the existence of liquid water
Fill in the blank(s) with correct word
A pendulum is made with a 4.00 kg mass suspended at the end of a thin rod. The period of the small motion simple harmonic motion is 1.00 sec. What is the length of the thin rod?
A. 24.8 cm B. 29.7 cm C. 31.4 cm D. 34.1 cm E. 36.2 cm
Which of the following statements about hadrons are correct? (There may be more than one correct choice.)
A) All hadrons are composed of quarks. B) All hadrons interact by the strong nuclear force. C) Hadrons are composed of leptons. D) Electrons, protons, and neutrons are commonly-occurring hadrons. E) Protons and neutrons are hadrons, but the electron is not.
The most important factor in soil development is
What will be an ideal response?