A student makes the following statements about the Universe - Scottish Highers Physics - Question 10 - 2019
Question 10
A student makes the following statements about the Universe.
I The force due to gravity acts against the expansion of the Universe.
II Measurements show the rate o... show full transcript
Worked Solution & Example Answer:A student makes the following statements about the Universe - Scottish Highers Physics - Question 10 - 2019
Step 1
I The force due to gravity acts against the expansion of the Universe.
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Answer
This statement is correct. Gravity acts as a force that pulls matter together, which counteracts the expansion of the Universe.
Step 2
II Measurements show the rate of expansion of the Universe is increasing.
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Answer
This statement is correct. Observations, particularly of distant supernovae, indicate that the rate of expansion of the Universe is increasing due to the influence of dark energy.
Step 3
III The mass of a galaxy can be estimated by the orbital speed of the stars within the galaxy.
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Answer
This statement is also correct. Using the principles of Newtonian mechanics and the rotational curve of galaxies, we can estimate the mass of a galaxy based on the orbital speeds of stars.
Step 4
Which of these statements is/are correct?
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Answer
Since all three statements are correct, the answer is E: I, II and III.
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