Oscillations — Physics STD 11 Science — Question

Why air quickly leaking out of a balloon becomes cooler?

Why is it not necessary for a body following another to stop, to avoid collision?

A container of area 0.02m² is filled with water. Find the pressure at the bottom of the container if a weight is placed on the piston. (as shown in the figure).

Why strain has no units?

A car starts accelerating from rest for sometime, maintains the velocity for sometime and then comes to rest with uniform deceleration. Draw V-t graph.

A rectangular brick is kept on a table with a part of its length projecting out. It remains at rest if the length projected is slightly less than half the total length but it falls down if the length projected is slightly more than half the total length. Give reason.

A black metal foil is warmed by radiation from a sphere at temperature T at a distance d. If the power received is P, find the power received when both the temperature and distance are doubled.

Write the units of momentum and impulse.

Sudden motion on a blanket removes dust. How?

When a solid melts or a liquid boils, the temperature does not increase even when heat is supplied. Where does the energy go?