Mechanical Properties of Solids — Physics STD 11 Science — Question

A body of mass 500g tied to a string of length 1m is revolved in the vertical circle with a constant speed. Find the minimum speed at which there will not be any slack on the string. Take g = 10m s^-2.

Find the average magnitude of linear momentum of a helium molecule in a sample of helium gas at 0°C. Mass of a helium molecule = 6.64 × 10^-27kg nd Boltzmann constant = 1.38 × 10^-23JK^-1.

How much weight will be required to lift a stone weighting 800 kg in a hydraulic lift. Given that the ratio of the cross-sectional areas of the two piston is 4 then is the work done by the machine more than the work done on the machine? Explain.

A cyclist covers first half of a length with a speed of 5m/s and the second half with a speed of 10m/s. What is the average speed of the cyclist?

The excess pressure inside a soap bubble is thrice the excess pressure inside a moving soap bubble. What is the ratio between the volume of the first and second bubble?

The stress-strain graphs for materials A and B are shown in Fig. 8.10.

The graphs are drawn to the same scale.
(a) Which of the materials has the greater Young’s modulus?
(b) Which of the two is the stronger material?

Name the physical quantity corresponding to force in rotational motion. How is it related to force and give its units?

A body builder exerts a force of 150N against a bullworker and compresses it by 20cm. Calculate the spring constant of the spring in the bullworker.

Which of the two persons shown in figure is more likely to fall down? Which external force is responsible for his falling down?

When is a body lying in a gravitation field in stable equilibrium?