Which of the following statements is true?
A) a molecule is the smallest existing particle
B) chemical elements are made up of about 100 distinct molecules
C) molecules form atoms that determine chemical properties of a substance
D) molecules are the smallest subdivision of matter that still retain a substance's chemical properties
E) none of the above
Answer: D
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Angular and Linear Quantities: An electrical motor spins at a constant 2695.0 rpm. If the rotor radius is 7.165 cm, what is the linear acceleration of the edge of the rotor?
A. 5707 m/s2 B. 281.6 m/s2 C. 572,400 m/s2 D. 28.20 m/s2
Lenz's Law: According to Lenz's law, the induced current in a circuit always flows to oppose the external magnetic field through the circuit.
A. True B. False
Velocity Addition: Consider three galaxies, Alpha, Beta and Gamma. An astronomer in Beta sees each of the other two galaxies moving away from him in opposite directions at 0.70c. At what speed would an observer in Alpha see the galaxy Gamma moving?
A. 0.70c B. 1.4c C. 0.82c D. 0.94c E. 0.98c
Newton's law of gravitation applies to all ______________
Fill in the blank(s) with the appropriate word(s)