Ramesh had 20 pencils,Sheelu had 50 pencils and Jamaal had 80 pencils.After 4 months,Ramesh used up 10 pencils.Sheelu used up 25 pencils and Jamaal used up 40 penciuls.What fraction did each use up ?Check if each has used up an equal fraction of their pencils?

A man whose mass is 50 kg climbs up 30 steps of a stair in 30 s. If each step is 20 cm high, calculate the power used in climbing stairs.

Using differentials, find the approximate value of each of the following up to 3 places of decimal: sqrt(25.3)

Using differentials, find the approximate value of each of the following up to 3 places of decimal: (15)^1/4

Using differentials, find the approximate value of each of the following up to 3 places of decimal: (82)^1/4

A magnetic field set up using Helmholtz coils is uniform in a small region and has a magnitude of 0.75 T. In the same region, a uniform electrostatic field is maintained in a direction normal to the common axis of the coils. A narrow beam of (single species) charged particles all accelerated through 15 kV enters this region in a direction perpendicular to both the axis of the coils and the electrostatic field. If the beam remains undeflected when the electrostatic field is 9.0 xx 10^5 V m^-1 make a simple guess as to what the beam contains. Why is the answer not unique?

Using differentials, find the approximate value of each of the following up to 3 places of decimal. (15)^(1//4)

Using differentials, find the approximate value of each of the following up to 3 places of decimal: (401)^(1/4)

Using differentials, find the approximate value of each of the following up to 3 places of decimal: (255)^1/4