Answer:
A system of two co-axial cylindersof different diameters which rotate together is called wheel and axle example; the door knob , knob of the tap ,screw driver,water tap
Explanation:
B.
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Because it occurs frequently and its does not cause as much damage as boloni
Answer:
The distance moved by the body in these 2 seconds is 22 meters.
Explanation:
Given that,
Initial velocity of a body, u = 6 m/s
Final velocity of the body, v = 16 m/s
Time, t = 2 s
Let d is the distance moved by the body in these 2 seconds is. Using third equation of motion to find it such that,

So, the distance moved by the body in these 2 seconds is 22 meters. Hence, this is the required solution.
Answer:
Average speed of Olympic runner will be 23.08 km/hr
Explanation:
We have given distance d = 27.3 miles
We know that 1 mile = 1.6 km
So 27.3 mile = 
Given time = 2 hour 45 minutes and 35 sec
We know that 1 hour = 60 minutes
So 45 minutes 
We also know that 1 hour = 3600 sec
So 1 sec 
So total time t =
We know that speed 