PART - 1 CH - 6 System of Particles and Rotational Motion — Physics STD 11 Science — Question

In a Callender's compensated constant pressure air thermometer, the volume of the bulb is 1800 cc. When the bulb is kept immersed in a vessel, 200 cc of mercury has to be poured out. Calculate the temperature of the vessel.

Oil spreads over the surface of water, whereas, water does not spread over the surface of oil. Why?

Calculate the number of degrees of freedom in 15cm³ of nitrogen at NTP.

A disc rotates about its axis with a constant angular acceleration of 4rad/s². Find the radial and tangential accelerations of a particle at a distance of 1cm from the axis at the end of the first second after the disc starts rotating.

From the given example, find if the motion is one or two or three-dimensional.

1. A kite flying in the sky.
2. A cricket ball hit by a player.
3. Moon revolving around the earth.
4. The motion of a stone in a circle.

A load of 10kg is suspended by a metal wire 3m long and having a cross-sectional area 4mm². Find.

1. The stress.
2. The strain and.
3. The elongation. Young's modulus of the metal is 2.0 × 10N¹¹N/ m².

The potential difference between the terminals of a 6.0V battery is 7.2V when it is being charged by a current of 2.0A. What is the internal resistance of the battery?

At noon, the sun and the earth pull the objects on the earth's surface in opposite directions. At midnight the sun and the earth pull these objects in same direction. Is the weight of an object, as measured by a spring balance on the earth's surface, more at midnight as compared to its weight at noon?

A football is kicked 20m/ s at a projection angle of 45°. A receiver on the goal line 25m away in the direction of the kick runs the same instant to meet the ball. What must be his speed, if he has to catch the ball before it hits the ground?

Define conservative and non- conservative forces. Give examples of these also