Multiple Choice 1. When can you treat a moving object as if it were a point-like

Question

Multiple Choice 1. When can you treat a moving object as if it were a point-like particle? A) Only if it really is a point-like particle. if were a point-like particle. B) You can always treat a moving object as acceleration. C) Only if the object is moving with constant D) Only if all parts of the object are moving in the same direction and at the same rate. E) This question has no physical meaning. 2. The position y a particle moving along the y axis depends on the time t according to the uation at bre. The dimensions of the quantities a and b are respectively: y B) LVT2, L2T C) LMT, LT2 E) none of these 3. travels 40 kilometers at an average speed of 80 km/h and then travels 40 kilometers at an average speed of 40 km/h. The average speed of the car for this 80 km trip is A) 40 km/h B) 45 km/h C) 53 km/h D) 60 km/h E) 80 km/h 4. Which of the following five coordinate versus time graphs represents the motion of an object whose speed is increasing? A) I B) II C) III

Explanation / Answer

1] option d is correct.

When all part is moving in same direction and with same acceleration, it can be considered as point object.

2]option C is correct, in order to make RHS in L (meter) dimension.

3]option c, total time taken = 40/80+40/40 = 1.5 hr

average speed = 80/1.5 = 53 km/h

4] option a as slope has to increase.

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