PART - 2 CH - 11 Thermodynamics — Physics STD 11 Science — Question

Can Bernoulli's equation be used to describe the flow of water through a rapid in a river? Explain.

A stone is fastened to one end of a string and is whirled in a vertical circle of radius R. Find the minimum speed the stone can have at the highest point of the circle.

Is it possible to convert internal energy into work or mechanical energy?

Answer the following: An artificial satellite orbiting the earth in very thin atmosphere loses its energy gradually due to dissipation against atmospheric resistance, however small. Why then does its speed increase progressively as it comes closer and closer to the earth?

Should the speed of two artificial satellites of the earth having different masses but the same orbital radius, be the same?

A comet orbits the sun in a highly elliptical orbit. Does the comet have a constant (a) linear speed, (b) angular speed, (c) angular momentum, (d) kinetic energy, (e) potential energy, (f) total energy throughout its orbit? Neglect any mass loss of the comet when it comes very close to the Sun.

Which of the following is the most precise device for measuring length: an optical instrument that can measure length to within a wavelength of light?

What is the ratio of r.m.s. speed of oxygen and hydrogen molecules at the same temperature?

Which of the following examples represent periodic motion? A swimmer completing one (return) trip from one bank of a river to the other and back.