Mechanical Properties of Solids — Physics STD 11 Science — Question

Does the phrase "direction of zero vector" have physical significance? Discuss in terms of velocity, force etc.

What is the difference between velocity-time graphs in uniform motion and uniformly accelerated motion?

Ultrasonic waves of frequency 4.5MHz are used to detect tumour in soft tissues. The speed of sound in tissue is 1.5km/s and that in air is 340m/s. Find the wavelength of this ultrasonic wave in air and in tissue.

The average speed of a snail is 0.020 miles/hour and that of a leopard is 70 miles/hour. Convert these speeds in SI units.

Two loudspeakers are arranged facing each other at some distance. Will a person standing behind one of the loudspeakers clearly hear the sound of the other loudspeaker or the clarity will be seriously damaged because of the 'collision' of the two sounds in between?

A boy is seated in a revolving chair revolving at an angular speed of 120 revolutions per minute. Two heavy balls form part of the revolving system and the boy can pull the balls closer to himself or may push them apart. If by pulling the balls closer, the boy decreases the moment of inertia of the system from 6kg-m² to 2kg-m², what will be the new angular speed?

As oscillating pendulum stops after some time. Is this a violation of the law of conservation of mechanical energy?

Write the formula for the speed of transverse waves in a stretched string and explain the symbols used in it