Waves — Physics STD 11 Science — Question

A brick weighing 4.0kg is dropped into a 1.0m deep river from a height of 2.0m. Assuming that 80% of the gravitational potential energy is finally converted into thermal energy, find this thermal energy is calorie.

The specific heat of argon at constant volume is 0.075 kcal kg^-1K^-1, then what will be its atomic weight? [Given, R = 2 cal mol^-1K^-1]

If one component of a vector is zero, and other component is not zero then can that vector be zero?

Tell the position of the center of mass of rectangular rod, disc and sphere etc.

If the angle of friction is 30° then what is coefficient of static friction?

If on giving 40J of heat to a system, work done on the system is 10J. What will be the change in internal energy of the system?

Give an example of uniformly accelerated linear motion.

Give the magnitude and direction of the net force acting on.
A cork of mass 10g floating on water.

It is easier to pull lawn roller than to push it. Why?

Does sound travel faster on a wet hot day or a dry cold day? Why?