Please Help it is a Physics Question. In a sealed cylinder, the volume of gas is recorded as 40 cm2 with a temperature of 30°C. 

What is the percentage increase in volume of the gas if the cylinder is heated until the gas temperature reaches 70°C? 

With an explanation.​

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.

Properties seen when one one substance changes to another are known as properties