quiz_10mar10 - Quiz 4 Name:_ 1)  Write down the...

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Unformatted text preview: Quiz 4 Name: _____________________ 1)  Write down the defini3on for Newton’s first law •  when no net external force acts on an object, the accelera3on of the object is zero. 2) A boat wants to cross a river in the shortest amount of 3me. The river is, to a good approxima3on, straight, with a constant width w. The boat has a hull speed (maximum speed with respect to the water) of 4 m/s. The river has a current of 2 m/s. In what direc3on should the operator aim the boat? Circle all that are true a) perpendicular to the banks of the river b) so that the x component of the boat’s velocity is 2 m/s in the direc3on opposite to that of the current c) so that the x component of the boat’s velocity is 2 m/s in the direc3on of the current d) so that the x component of the boat’s velocity is 1 m/s in the direc3on opposite to that of the current e) so that the x component of the boat’s velocity is 1 m/s in the direc3on of the current f) none of the above I’ll accept either a or c. A is correct for the boat’s velocity measured rela3ve to the water; c when measured with respect to the land. 3) There are two iden3cal objects, O1 and O2. O1 is siRng on flat ground. O2 is siRng on an incline (hill). How does the normal force that the ground applies to the object ac3ng on O1 and O2 compare? Circle all that can be true. a) O1>O2 b) O1=02 c) O1<O2 d) not enough informa3on provided e) none of the above ...
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This document was uploaded on 12/28/2011.

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