PART - 2 CH - 14 Waves — Physics STD 11 Science — Question

State the number of significant figures in the following:
6.320 J

Four 2cm × 2cm × 2cm cubes of ice are taken out from a refrigerator and are put in 200ml of a drink at 10°C.

1. Find the temperature of the drink when thermal equilibrium is attained in it.
2. If the ice cubes do not melt completely, find the amount melted. Assume that no heat is lost to the outside of the drink and that the container has negligible heat capacity. Density of ice = 900kg-m^-3, density of the drink = 1000kg-m^-3, specific heat capacity of the drink = 4200Jkg^-1-K^-1, latent heat of fusion of ice = 3.4 × 10⁵J-kg^-1.

At what inclination should a player throw the ball from horizontal so that the ball travels the maximum distance?

What would be the effect on rms velocity of gas molecules, if the temperature of the gas is increased by a factor 4?

Give an example of:
A physical quantity which has a unit but no dimensions.

A steel wire of cross-sectional area 0.5mm² is held between two fixed supports. If the wire is just taut at 20^°C, determine the tension when the temperature falls to 0^°C. Coefficient of linear expansion of steel is 1.2 × 10^-5 °C^-1 and its Young's modulus is 2.0 × 10¹¹N m^-2.

An electrolysis experiment is stopped and the battery terminals are reversed:

1. The electrolysis will stop.
2. The rate of liberation of material at the electrodes will increase.
3. The rate of liberation of material will remain the same.
4. Heat will be produced at a greater rate.

What is the thermodynamical work in a reversible process?

The work done in adiabatic change depends only on what?