Which of these is an accurate statement of Newton's first law?
a. An object at rest tends to remain at rest.
b. An object in motion tends to remain in motion.
c. An object with no force acting along its direction of motion tends to move in a circle at constant speed.
d. In the absence of an unbalanced force, the velocity of an object remains constant.
e. In the absence of an unbalanced force, the speed of an object remains constant.
d
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Solar prominences have twisted and looped shapes because of the solar magnetic field
Indicate whether the statement is true or false
Recovered strain is _____________strain.
Fill in the blank(s) with the appropriate word(s).
The "close encounter hypothesis" suggested that the planets formed after a near-collision between our Sun and another star. If this hypothesis were correct, which of the following would be true?
A) Planetary systems would be very rare. B) Planetary systems would be very common. C) Most planetary systems would have their jovian planets closer to their stars and their terrestrial planets farther from their stars. D) Most planetary systems would have the same number of planets as our own. E) All planetary systems would be at least 4 billion years old.
The spectral lines of atomic spectra are
A) images of the slit in a spectroscope. B) orderly, and even predictable. C) as an identity of atoms as fingerprints are of people. D) all of the above E) none of the above