Which one of the choices below represents the preferred practice regarding significant figures when adding the following: 12.4 + 14 + 67.37 + 4.201?
a. 98
c. 97.97
b. 98.0
d. 97.971
A
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Suppose you kick a soccer ball straight up to a height of 10 meters. Which of the following is true about the gravitational potential energy of the ball during its flight?
A) The ball's gravitational potential energy is greatest at the instant when the ball is at its highest point. B) The ball's gravitational potential energy is greatest at the instant it returns to hit the ground. C) The ball's gravitational potential energy is always the same. D) The ball's gravitational potential energy is greatest at the instant the ball leaves your foot.
The outer Jovian planets most likely formed from
A) clumps of hydrogen and helium gas spun from a rapidly rotating protosun B) larger collections of hydrogen and helium gas attracting particles of rock and ice to them C) the collision and coalescence of clumps of hydrogen and helium gas within the solar nebula D) planetesimals of rock and ice attracting hydrogen and helium gas from the solar nebula
The initial rise off the main sequence in stage 8 comes from gravitational energy of the contracting helium core
Indicate whether the statement is true or false
A ball is thrown straight up and returns to its starting point under an acceleration due to gravity. Which of the following is true?
A) It took less time to rise than to fall. B) To compare rise and fall times we need to know the mass of the ball. C) It took the same time to rise as it took to fall. D) It took longer to rise than to fall.