Find the ratio of powers of the following two persons?
Person A does a work of 100 J in 5 seconds.(b) Person B does a work of 200J in 6 sec.

What is the power of a machine which does 2000 joules of work in 10 seconds ?

Find the area of the parallelogram having two adjacent sides OA and OB where O is the origin and the position vectors of A and B are respectively vec a= hat i+ 2 hat j+ 3 hat k , vec b= -3 hat i- 2 hat j+ hat k .

Are the following sets of ordered pairs functions? (a,b), a is a person, b is an ancestor of a

Find the number of ways to give 16 different things to three persons A, B, C so that B gets 1 more than A and C gets 2 more than B.

Form the pair of linear equations in the following problems and find their solutions (if they exist) by any algebraic method :- The ratio of incomes of two persons is 9 : 7 and ratio of their expenditures is 4 : 3. If each of them saves ? 200 per month. Find their monthly incomes.

A person walking on a horizontal road with a load on his head does no work.Explain.

Find the potential difference between two points if 5J of works is done in moving a charge of 2mC from one point to another.

Two person can finish the work in 7 days. (i) One of the persons fell ill before the work started . How much time will the other person take to finish the same work. (ii) How many persons will be needed to finish the work in one day.

Work out the following divisions : 96abc(3a – 12) (5b – 30) -: 144(a – 4) (b – 6)