If the Hubble constant is 25 km/s per million light-years, use it to estimate the age of the universe? (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s)

A) 15 Gy B) 10 Gy C) 20 Gy D) 12 Gy E) 25 Gy


D

Physics & Space Science

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Why does the rotation of our galaxy suggest that it is more massive than previously thought?

What will be an ideal response?

Physics & Space Science

From Kepler's third law, a hypothetical planet that is twice as far from the Sun as Earth should have a period of

A) 1/2 Earth year. B) more than 2 Earth years. C) 1 Earth year. D) 2 Earth years. E) It depends on the planet's mass.

Physics & Space Science

The force between two bar magnets cannot be due to gravity, because

A) the force between magnets is far too large to be caused by gravity. B) the force between magnets can be repulsive, while gravity must be attractive. C) Both of the above. D) the force of gravity is always downward, unlike the magnetic force. E) All of the above.

Physics & Space Science

Instructions: On occasion, the notation  = [A, ?] will be a shorthand notation for  .

Dana says any vector  can be represented as the sum of two vectors: . Ardis says any vector can be represented as the difference of two vectors:  . Which one, if either, is correct? A.

They are both wrong: every vector is unique.

B.
Dana is correct: Any vector can be represented as a sum of components and not as a difference.

C.
Ardis is correct: Any vector can be represented as a difference of vector components and not as a sum.

D.
They are both correct: A difference of vectors is a sum  .

E.
They are both wrong: Vectors can be moved as long as they keep the same magnitude and direction.

Physics & Space Science