Thermal Properties of Matter — Physics STD 11 Science — Question

Two soap bubbles have radii in the ratio 2 : 3. Calculate the ratio of work done in blowing these bubbles.

Why bells are made of metal and not wood?

When a body is weighed on an ordinary balance we demand that the arm should be horizontal if the weights on the two pans are equal. Suppose equal weights are put on the two pans, the arm is kept at an angle with the horizontal and released. Is the torque of the two weights about the middle point (point of support) zero? Is the total torque zero? If so, why does the arm rotate and finally become horizontal?

At which point on its path a projectile has the smallest speed?

For giving rotational motion to machines how should the shaft be?

What does the slope of stress versus strain graph indicate?

Which of the following examples represent periodic motion?

A hydrogen molecule rotating about its centre of mass.

Why is the necessary for a pendulum performing simple harmonic motion that its amplitude be less than its length?

Resonance is an example of________.

Does the centre of mass of a solid necessarily lie within the body? If not, give an example.