In a dropper, water does not come out, unless rubber bulb is pressed. Why ?

Give reason for the following statements: (a) A liquid inside a dropper comes out only when its rubber bulb is pressed hard. (b) Two holes are made to empty an oil tin.

Why does ice oat in water ?

The water that comes out during guttation is

When liquid medicine of density rho is to be put in the eye, it is done with the help of a dropper. As the bulb on the top of the dropper is pressed, a drop forms at the opening of the dropper. We wish to estimate the size of te drop. We first assume that the drop formed at the opening is spherical because that requires a minimum increase in its surface energy. To determine the size, we calculate the net vertical force due to the surfacetension T when the radius of the drop is R. When this force becomes smaller than the weight of the drop, the drop gets detached from the dropper. If the radius of the opening of the dropper is r , the vertical force due to the surface tension on the top of radius R (assuming rltltR ) is

When liquid medicine rho is to be put in the eye, it is done with the help of a dropper. As the bulb on the top of the dropper is pressed, a drop froms at the opening of the dropper. We wish to estimate the size of the drop. We first assume that the drop formed at the opening is osperical becaus ethat requires a minimum increase in its surface energy. To datermine the size., we calculate the net vertical force due to the surface tension T when the radius of the drop is R . When this force become smaller than the wight of the drop, the drop gets detached from the droppr. If the radius of the opening of the dropper is r , the verital force due to the surface tension on the drop of radius R (assuming r ltlt R ) is :

When liquid medicine of density rho is to be put in the eye, it is done with the help of a dropper. As the bulb on the top of the dropper is pressed, a drop forms at the opening of the dropper. We wish to estimate the size of te drop. We first assume that the drop formed at the opening is spherical because that requires a minimum increase in its surface energy. To determine the size, we calculate the net vertical force due to the surfacetension T when the radius of the drop is R. When this force becomes smaller than the weight of the drop, the drop gets detached from the dropper. If r=5xx10^(-4) m overset(~)(n)=10^(3)kgm^(-3) , g=10ms^(-2) , T=0.11Nm^(-1) the radius of the drop when it detaches from the dropper is approximately

A fused bulb does not glow. Why

Blood does not stop coming out of a wound in