A sticky hockey puck slides along a frictionless, horizontal ice surface at 75 m/s in the +x direction. It collides with a second sticky puck originally sliding at 25 m/s in the -y direction. They collide totally inelastically. If the first puck has a mass equal to twice that of the second, what is the angle of their final velocity vector below the +x direction?

A. 37 degrees
B. 9.5 degrees
C. 49 degrees
D. 42 degrees
E. 34 degrees


B. 9.5 degrees

Physics & Space Science

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What is the main reason that hydrogen-driven automobiles have not replaced gasoline ones?

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A. JPEGs B. vector images C. PNGs D. WebPs

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The most important fact about a cluster of stars that makes them useful for studying star formation is that

A) all the stars formed from the same cloud. B) all the stars formed at about the same time. C) all the stars are at the same distance from Earth. D) all the stars have the same chemical composition. E) all the stars are the same spectral type.

Physics & Space Science