How are the motions of a wheel of a moving bicycle and a mark on the blade of a moving electric fan different? Explain.

(a) If the car is moving on straight road

B’s exhaust fan will expel the hot air more effectively because hot air rises up and her fan is at greater height than A’s.

Similarity : Both show a circular motion. Difference : Bicycle shows a rectilinear motion whereas a ceiling fan does not.

a– (ii); b– (i); c– (iii).

Range of voltmeter, VR = 0.5 V  Number of divisions in voltmeter, VN = 20  Least count of voltmeter = VR /  V N  = 0.5 /  20 = 0.025 V

 The correct answer is: (a), (c) (a), kinetic  (c) mechanical

The correct answer is all  (a) kinetic  (b) total  (c) mechanical  (d) internal.

(b) The rod and the experimenter move with the same speed v in opposite directions.

On taking this snake below a fan, it moves in the anticlockwise direction. This is because, here the air is moving downwards.

(a) In case of object moving along a circular path two types of forces centripetal and centrifugal acts upon it. As they have opposite impact thus, the object remains in...