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


C

Physics & Space Science

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Electromagnetic waves are generally

A. standing waves. B. longitudinal waves. C. transverse waves. D. a 50/50 combination of transverse and longitudinal waves.

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Which of these particles has the least mass?

a. electron neutrino b. muon c. electron d. pion

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The oldest-known smelted iron dates to approximately what year?

(a) 27,000 BCE (b) 6000 BCE (c) 2500 BCE (d) 1000 BCE

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What would be the next step in the scientific process for the Copernican heliocentric model?

In 1500s, Copernicus reintroduced the heliocentric model that the ancient Greeks had rejected, and it began to gain favor among some scientists. He suggested that the planets all orbit around the Sun in perfect circles, as shown in the figure to the right. This offers a much more elegant explanation of retrograde planetary motion than the geocentric model.

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