When an electron is placed in an electric field,
it experience an electric force whose magnitude
is 1.6 times its weight . find the magnitude
of the electric field.
Father reduced the quantity of food bought for
the family by ((25)/2)% . When he found that the
cost of living has increased by 15%. What
is the fraction increase in the family′s food
bill now ?
find the equation of the sphere which touches the plane
3x+2y−z+2=0 at the point (1,−2,1) and cuts orthogonally the
the sphere x^2 +y^2 +z^2 −4x+6y+4=0