Waves — Physics STD 11 Science — Question

Given a + b + c + d = 0, which of the following statements are correct:

b + c must lie in the plane of a and d if a and d are not collinear, and in the line of a and d, if they are collinear?

Can we define specific heat capacity for an adiabatic process?

White clothes are more comfortable in summer while colourful clothes are more comfortable in winter. Why?

One joule energy is equivalent to how many ergs?

A cube of iron (density = 8000kg m^-3, specific heat capacity = 470J kg^-1 K^-1) is heated to a high temperature and is placed on a large block of ice at 0°C. The cube melts the ice below it, displaces the water and sinks. In the final equilibrium position, its upper surface just goes inside the ice. Calculate the initial temperature of the cube. Neglect any loss of heat outside the ice and the cube. The density of ice = 900kg m^-3 and the latent heat of fusion of ice = 3.36 × 10⁵J kg^-1.

If the speed of a particle moving. at a relativistic speed is doubled, its linear momentum will:

1. Become double.
2. Become more than double.
3. Remain equal.
4. Become leas than double.

State if the following statements is true or false. Give reasons for your answer:
Total energy of a system is always conserved, no matter what internal and external forces on the body are present.

Tell the value of the sum of internal forces acting on the object.

If the length of a wire is cut to half then what would be the effect on the maximum weight which it bears?