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A kid of mass M stands at the edge of a platform of radius R which can be freely rotated about its axis. The moment of inertia of the platform is I. The system is at rest when a friend throws a ball of mass m and the kid catches it. If the velocity of the ball is \[\nu\] horizontally along the tangent to the edge of the platform when it was caught by the kid, find the angular speed of the platform after the event.
Concept: undefined >> undefined
If you are walking on the moon, can you hear the sound of stones cracking behind you? Can you hear the sound of your own footsteps?
Concept: undefined >> undefined
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Can you hear your own words if you are standing in a perfect vacuum? Can you hear your friend in the same conditions?
Concept: undefined >> undefined
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?
Concept: undefined >> undefined
The voice of a person, who has inhaled helium, has a remarkably high pitch. Explain on the basis of resonant vibration of vocal cord filled with air and with helium.
Concept: undefined >> undefined
Two tuning forks vibrate with the same amplitude but the frequency of the first is double the frequency of the second. Which fork produces more intense sound in air?
Concept: undefined >> undefined
Two blocks of masses 400 g and 200 g are connected through a light string going over a pulley which is free to rotate about its axis. The pulley has a moment of inertia \[1 \cdot 6 \times {10}^{- 4} kg - m^2\] and a radius 2⋅0 cm, Find (a) the kinetic energy of the system as the 400 g block falls through 50 cm, (b) the speed of the blocks at this instant.
Concept: undefined >> undefined
The pulley shown in the following figure has a radius of 20 cm and moment of inertia 0⋅2 kg-m2. The string going over it is attached at one end to a vertical spring of spring constant 50 N/m fixed from below, and supports a 1 kg mass at the other end. The system is released from rest with the spring at its natural length. Find the speed of the block when it has descended through 10 cm. Take g = 10 m/s2.
Concept: undefined >> undefined
When we clap our hands, the sound produced is best described by Here p denotes the change in pressure from the equilibrium value.
Concept: undefined >> undefined
The bulk modulus and the density of water are greater than those of air. With this much of information, we can say that velocity of sound in air
Concept: undefined >> undefined
A tuning fork sends sound waves in air. If the temperature of the air increases, which of the following parameters will change?
Concept: undefined >> undefined
When sound wave is refracted from air to water, which of the following will remain unchanged?
Concept: undefined >> undefined
Two sound waves move in the same direction in the same medium. The pressure amplitudes of the waves are equal but the wavelength of the first wave is double the second. Let the average power transmitted across a cross section by the first wave be P1 and that by the second wave be P2. Then
Concept: undefined >> undefined
When two waves with same frequency and constant phase difference interfere,
Concept: undefined >> undefined
A tuning fork of frequency 512 Hz is vibrated with a sonometer wire and 6 beats per second are heard. The beat frequency reduces if the tension in the string is slightly increased. The original frequency of vibration of the string is
Concept: undefined >> undefined
A small source of sounds moves on a circle as shown in figure and an observer is sitting at O. Let \[v_1, v_2, v_3\] be the frequencies heard when the source is at A, B and C respectively.
Concept: undefined >> undefined
When you speak to your friend, which of the following parameters have a unique value in the sound produced?
Concept: undefined >> undefined
An electrically maintained tuning fork vibrates with constant frequency and constant amplitude. If the temperature of the surrounding air increases but pressure remains constant, the produced will have
(a) larger wavelength
(b) larger frequency
(c) larger velocity
(d) larger time period.
Concept: undefined >> undefined
The fundamental frequency of a vibrating organ pipe is 200 Hz.
(a) The first overtone is 400 Hz.
(b) The first overtone may be 400 Hz.
(c) The first overtone may be 600 Hz.
(d) 600 Hz is an overtone.
Concept: undefined >> undefined
A source of sound moves towards an observer.
Concept: undefined >> undefined
