Distinguish between dependent and independent variables
The independent variable produces a change in the dependent variable. The
dependent variable is, therefore, referred to as a function of the independent variable.
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A substance that increases the rate of a chemical reaction but is not consumed in the reaction is called
a. an oxidizing agent. b. a catalyst. c. an activation agent. d. a reducing agent.
A string is stretched and fixed at both ends, 200 cm apart. If the density of the string is 0.015 g/cm, and its tension is 600 N, what is the fundamental frequency?
a. 316 Hz b. 632 Hz c. 158 Hz d. 215 Hz e. 79 Hz
The radius of a typical nucleus is about 5.0 × 10-15 m. Assuming this to be the uncertainty in the position of a proton in the nucleus, estimate the uncertainty in the proton's energy (in eV)
A) 0.2 MeV B) 0.4 MeV C) 0.6 MeV D) 0.8 MeV E) 1.0 MeV
A cluster with a lot of Type O and B stars, but no bright K or M stars, is very
A) faint. B) poor in heavy elements. C) young. D) old. E) densely packed.