Question

A crowbar is used to lift a load of 1200N by placing it at a distance of 25 cm from the fulcrum .calculate the force required at 60cm from the fulcrum to balance the load.

Answer 1

L= 1200N
Ld = 25 cm = 0.25m
Ed = 60 cm = 0.60m
E = ?
Then,
According to the principle of lever,
L x Ld = E x Ed
On solving, E = 500 N 
Which is the required force.

Answer 2

Answer:

//to calculate the selling price

class price

{

void method(int mp)

{

int d=0;

double sp=0;

if(mp>=1 &&mp<=2000)

d=0;

else if(mp>=2001 && mp<=5000)

d=4;

else if(mp>=5001 && mp<=7500)

d=8;

else

d=10;

sp=mp-(mp*d)/100.0;

System.out.println("MARKED PRICE "+mp);

System.out.println("SELLING PRICE "+sp);

}

}