The biggest surprise from the New Horizons flyby of Pluto was learning that Pluto _________.
A. has an ice-rich composition
B. is too small to be considered a planet
C. shows clear evidence of recent or ongoing geological activity
D. has a moon named Charon
Ans: C. shows clear evidence of recent or ongoing geological activity
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Express the result of the following calculation, in scientific notation, to the proper number of significant figures: ((395600.1)/(6.72)) + 19
What will be an ideal response?
The de Broglie wavelength of an electron is 380 nm. What is the speed of this electron?
A) 2.04 × 103 m/s B) 3.83 × 103 m/s C) 1.92 × 103 m/s D) 4.12 × 103 m/s E) 5.22 × 103 m/s
How many significant figures are in the number 120.070?
A) six B) five C) four D) three
What was one obstacle Newton encountered in developing his theory of universal gravitation from his observation of heavenly bodies?
a. He had to prove that Earth was nearly spherical. b. He had to figure out why the Moon doesn't fall down. c. He had to spend many years observing the movement of the planets. d. He had to prove that the mass of the Earth acts as if it was concentrated at the planet's center. e. He had to prove the inverse-square law.