There is a circular path around a sports field. Preeti takes 18 minutes to drive one round of the field, while Suman takes 12 minutes for the same. .

(b) (i) and (iv)

How will the plate cool faster & not the sphere

The required velocity is √(gr)

Time taken = 2 min 20 sec = 140 sec.  Radius, r = 100 m.  In 40 sec the athlete complete one round.  So, in 140 sec the athlete will complete = 140...

Here,  r = 42250 km = 42250000 m  T = 24 h = 24 × 60 × 60 s  Using                        Speed, v...

Personality, “Personality is that qualiting which permits a prediction of what a person will do in a given situation”.  * Personality of an individual consists of four dimensions such as physical,...

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(i) Yes, Alpha particles being positively charged constitute a current in the direction of motion. (ii) No. The neutrons being electrically neutral constitute no current.

(d) The instantaneous acceleration of the earth points towards the sun. Explanation:  Since during the mentioned period in (a) and (b) the earth covers a semi circle and there is a displacement...