121 Winter 2019 #3

Please read carefully and answer properly

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* 1. In order to receive credit, we need your name

First Name

Last Name

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The positions of two blocks at successive 0.20-second time intervals are represented by the numbered squares in the figure below. The blocks are moving toward the right.

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* 2. Do the blocks ever have the same speed?

No.

Yes, at instant 2.

Yes, at instant 5.

Yes, at instants 2 and 5.

Yes, at some time during the interval 3 to 4.

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The positions of two blocks at successive 0.20-second time intervals are represented by the numbered squares in the figure below. The blocks are moving toward the right.

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* 3. The accelerations of the blocks are related as follows:

The acceleration of "a" is greater than the acceleration of " b".

The acceleration of "a" equals the acceleration of "b". Both accelerations are greater than zero.

The acceleration of "b" is greater than the acceleration of "a".

The acceleration of "a" equals the acceleration of "b". Both accelerations are zero.

Not enough information is given to answer the question.

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* 4. Despite a very strong wind, a tennis player manages to hit a tennis ball with her racquet so that the ball passes over the net and lands in her opponent's court.

Consider the following forces:
1. A downward force of gravity.
2. A force by the "hit".
3. A force exerted by the air.

Which of the above forces is (are) acting on the tennis ball after it has left contact with the racquet and before it touches the ground?

1 only.

1 and 2.

1 and 3.

2 and 3.

1, 2, and 3.

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* 5. A stone dropped from the roof of a single story building to the surface of the earth:

reaches a maximum speed quite soon after release and then falls at a constant speed thereafter.

speeds up as it falls because the gravitational attraction gets considerably stronger as the stone gets closer to the earth.

speeds up because of an almost constant force of gravity acting upon it.

falls because of the natural tendency of all objects to rest on the surface of the earth.

falls because of the combined effects of the force of gravity pushing it downward and the force of the air pushing it downward.

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* 6. In the above diagram a cannon ball is fired and returns to earth. At right are 5 vectors directions, with E being a zero vector. When the ball is at pt. 3, the ball's displacement from where it started is closest to which vector direction?

121 Winter 2019 #3

Please read carefully and answer properly

Question Title

* 1. In order to receive credit, we need your name

Question Title

The positions of two blocks at successive 0.20-second time intervals are represented by the numbered squares in the figure below. The blocks are moving toward the right.

Question Title

* 2. Do the blocks ever have the same speed?

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The positions of two blocks at successive 0.20-second time intervals are represented by the numbered squares in the figure below. The blocks are moving toward the right.

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* 3. The accelerations of the blocks are related as follows:

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* 5. A stone dropped from the roof of a single story building to the surface of the earth:

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* 6. In the above diagram a cannon ball is fired and returns to earth. At right are 5 vectors directions, with E being a zero vector. When the ball is at pt. 3, the ball's displacement from where it started is closest to which vector direction?

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* 7. In the diagram above, the velocity of the ball at pt. 3 is closest to which direction?

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* 8. In the diagram above, the acceleration of the ball at pt. 3 is closest to which direction?