When Cavendish claimed that he "weighed" Earth, he actually calculated the

A. force that the Moon exerts on Earth.
B. weight of Earth.
C. mass of Earth.
D. force that the Sun exerts on Earth.


Answer: C. mass of Earth.

Physics & Space Science

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Pythagoras proposed that all nature was underlain by musical principles, by which he meant _______________

Fill in the blank(s) with correct word

Physics & Space Science

On the H-R diagram, cool and bright stars are located in the ________ corner

a. upper left b. upper right c. lower left d. lower right

Physics & Space Science

Which of the following is a possible unit of acceleration?

a. m/s2 b. m × s c. m2/s d. m/s

Physics & Space Science

A delivery truck and a car collide. Which vehicle experiences the greater acceleration?

A. the car B. the truck C. Both the car and the truck experience the same acceleration. D. We need to know the speed of the truck and the car to find the answer. E. We need to know the mass of the truck and the car to find the answer.

Physics & Space Science