Motion in a Straight Line — Physics STD 11 Science — Question

Explain why the speed of a whirl wind in a tornado is alarmingly high.

When the earth shrinks, without reducing its mass, what change will be there in the duration of a day?

Relate emissivity 'e', absorptivity ‘a' and reflectivity ‘r’.

Is coefficient of performance of a refrigerator constant?

What is the basic unit of quantity of substance?

A glass of water has an ice cube floating in water. The water level just touches the rim of the glass. will the water overflow when the ice melts?

A satellite revolves round the earth. Air pressure inside the satellite is maintained at 76cm of mercury. What will be the height of mercury column in a barometer tube 1m long placed in the satellite?

When the pressure on a sphere is increased by 80 atmospheres, then its volumes decreases by 0.01%. Find the bulk modulus of elasticity of the material of sphere.

What is the value of specific heat of water in S.I. units? Does it vary with temperature?

Which quantity does not change during change of state?