A vertically-held sledge hammer is easier to balance when the heavier end is

A) on your hand.
B) at the top, away from your hand.
C) the same either way


Answer: B

Physics & Space Science

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Suppose we discover a new comet on an orbit that brings it closer to the Sun than Mercury every 125 years. What can we conclude?

A) It has a coma and tail during most of each orbit. B) It came from the Kuiper belt. C) It has been on its current orbit for only a very short time compared to the age of our solar system. D) It came from the Oort cloud.

Physics & Space Science

A dinner plate falls vertically to the floor and breaks up into three pieces, which slide horizontally along the floor

Immediately after the impact, a 200-g piece moves along the +x-axis with a speed of 2.00 m/s, a 235-g piece moves along the +y-axis with a speed of 1.50 m/s. The third piece has a mass of 100 g. What is the speed of the third piece? A) 3.50 m/s B) 6.83 m/s C) 5.33 m/s D) 2.57 m/s E) 2.51 m/s

Physics & Space Science

When does a protostar become a true star?

A) when the star is 1 million years old B) when the central temperature reaches 1 million Kelvin C) when nuclear fusion begins in the core D) when the thermal energy becomes trapped in the center E) when the stellar winds and jets blow away the surrounding material

Physics & Space Science

Because the changes in energy levels happen in discrete steps, we refer to these as ________ leaps

Fill in the blank(s) with correct word

Physics & Space Science