Heart discharges 75 cc of blood through the arteries ar each beat against an average pressaure of 10 cm of mercury Assuming pulse frequency of 72 / min the rate of working of heart in watt is

 

mercury density 13.6

g = 9.8

 

Ans 1.19 W

 

 

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An engine pumps up 100 kg of water through a height of 10 m in 5 sec

efficiency of engine being 60 % what is power of engine

 

Ans 3.3 KW

 

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A 150 g cricket ball moving horizontally at 20 m/sec was hit straight back to bowler at 12 m/sec   if contact with bat lasted for 1/25 sec then average forc eexerted by bat on ball is

 

Ans 120 N

 

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A man sits on a chair supported by a rope passing over a frictionless pulley the man who weighs 1000N exerts a force of 450 N chair downward while pulling on the rope . if the char weighs 250 N & g =10   then acceleration of chair is

 

Ans  2 m/sec^2

 

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A trader sells his articles weighing equal quantities frm 2 pans of a balance having unequal arms Then he

 

1)Loses           2) gains

 

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A 20 kg block is initially at rest a 75 N force is required to set block in motion . after the motion a force of 60N is applied to keep the block moving at constant speed the coefficient of static friction is

 

Ans .37

 

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An object kept on smooth inclined plane of 1 in L  can be kept stationary relative to the incline by giving a acceleration to the incline by

 

Ans gtan

 

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 a block of mass M is placed on a smooth inclined plane of inclination  with horizontal the inclined plane is accelerated horizontally so that the block does not sslide down

 

1)What should be the acceleration of inclined plane         Ans g cos

2)What vertical force is exerted by inclined plane on block     Ans mg

 

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yes as per last year stands ypu still have chance

 

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