Which of the following expresses a principle, which was initially stated by Galileo and was later incorporated into Newton's laws of motion?
a. An object's acceleration is inversely proportional to its mass.
b. For every action there is an equal but opposite reaction.
c. The natural condition for a moving object is to remain in motion.
d. The natural condition for a moving object is to come to rest.
c
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The star named Circini has the spectral type and luminosity class of O 8.5 V. Based on this information, which of the following are true? I. Circini has a surface temperature less than the sun. II. Circini has a diameter that is greater than that of the sun. III. Circini is more luminous than the sun. IV. Circini is located near the upper left hand corner in the HR diagram
a. I & II b. II & IV c. II, III, & IV d. I, II, & III e. I, II, III, & IV
The decay rate of a radioactive sample decreases from 175 kBq to 12.4 kBq in 18.3 s. What is the half-life of this sample?
What will be an ideal response?
The symbol G is used to represent
a. the acceleration of gravity. b. the universal gravitational constant. c. grams. d. gravity. e. none of the above.
A laser shines 630-nm light through a grating producing a first-order (m = 1) maximum at an angle of 30°. A second laser produces a first-order maximum with the same grating at 20°. What is the wavelength emitted by the second laser?
a. 945 nm b. 651 nm c. 420 nm d. 431 nm