Professor Price PHYS 1305/1405-01 Option A September 26, 7. Three balls A, B, an

Question

Professor Price PHYS 1305/1405-01 Option A September 26, 7. Three balls A, B, and C have the same diameter, but they have different masses. are thrown upward with initial speeds of 10 m/s, 15 m/s, and 3 m/s respectively.From fastest to slowest,rank the accelerations of the balls I second after being thrown.. ot Sec al haue 15 10kg 1.51g A) A, B, C B) B, C, A C) C, B, A o-10 15-Jo lo-3- B, A, C E) A-B-C, all have the same acceleration after 1 second. Nellie Newton hangs motionless by one hand from a clothesline which side ofthe line, (a) or (b), has the smaller tension'? / al C) neither side is greater, (a) - (b) From least to greatest, rank the tracks in terms of the average speeds of the balls. B) B, C, A C, A, B

Explanation / Answer

7] option E is correct, because acceleration = g downward.

8] B will have smaller tension because, horizontal components of both tensions have to be equal,

Tb cos B = Ta cos A where A and B are angles of a and b with horizontal. Clearly cosB is bigger than cosA, so Tb<Ta

9] option A is correct,

by energy conservation, B drops more, so gains more KE and velocity than A. C does it for even more path.

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