Properties of matter questions | form five Physics

Briefly explain the following observations

1. soap solution is a better cleansing agent than ordinary water.
2. When a piece of chalk is put into water, it emits bubbles in all directions.

Answer / Solution

UNSOLVED

Two spherical soap bubbles are combined . If V is the change in volume of the contained air, A is the change in total surface area, show that , where T is the surface tension and P_a is the atmospheric pressure.

Answer / Solution

UNSOLVED

There is a soap bubble of radius 3.6x10^-4m in air cylinder which is originally at a pressure of 10⁵Nm². The air in the cylinder is now compressed isothermally until the radius of the bubble is halved. Calculate the pressure of air in the cylinder.

Answer / Solution

UNSOLVED

1. What is strain energy?
2. A piece of rod 1.05m long whose weight is negligible is supported at its ends by wires Q and P of equal lengths as shown in figure 1.

The cross sectional area of P is 1mm² and that of Q is 2mm². At what point along the bar should the weight be suspended in order to produce

1. Equal stress of P and Q
2. Equal strain of P and Q

(Given Young`s modulus of wire P=2.4x10¹¹Nm^-2 and that of wire Q=1.6x10¹¹Nm^-2)

Answer / Solution

UNSOLVED

Define the following materials as classified on the basis of elastic properties

1. Ductile materials
2. Brittle materials
3. Elastomers

Answer / Solution

UNSOLVED