Physical World — Physics STD 11 Science — Question

For any given metal the Young's Modulus of elasticity is 2.4 times the modulus of rigidity. What would be its poisson ratio?

Is the complete kinetic energy dissipated in a perfectly elastic collision?

Can the temperature of an isolated system change?

The temperature of the atmosphere at a high altitude is around 500°C. Yet an animal there would freeze to death and not boil. Explain.

Value of g is largest at the poles due to _________.

Fill in the blanks using the word (s) from the list appended with statement: Viscosity of gases . . . with temperature, whereas viscosity of liquids . . . with temperature. (increases/ decreases)

Why is it not necessary for a body following another to stop, to avoid collision?

A shell is fired from a cannon and it explodes at the top. What will be the change in its momentum and kinetic energy?

What does spring balance measure: Mass or Weight?

A coolie with load on his head is walking on a horizontal plateform. What is work done against gravity?