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IMPORTANT
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A disc of moment of inertia I1 is rotating in horizontal plane about an axis passing through a center and perpendicular to its plane with constant angular speed ω1. Another disc of moment of inertia I2 having zero angular speed is placed co-axially on a rotating disc. Now, both the discs are rotating with constant angular speed ω2. The energy lost by the initial rotating disc is,

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Important Questions on JEE Main & Adv./BITSAT/KERALA CEE/KCET AP & TS EAMCET/VIT/MHT CET

MEDIUM
JEE Main
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 20 - JEE Main & Adv./BITSAT/KERALA CEE/KCET AP & TS EAMCET/VIT/MHT CET>SOLVED PAPERS 2017>Q 22
A particle performs linear SHM at a particular instant, velocity of the particle is u and acceleration is α while at another instant velocity is v and acceleration is β 0<α<β. The distance between the two position is,
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JEE Main
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 20 - JEE Main & Adv./BITSAT/KERALA CEE/KCET AP & TS EAMCET/VIT/MHT CET>SOLVED PAPERS 2017>Q 23
The observer is moving with velocity v0 towards the stationary source of sound and then after crossing moves away from the source with velocity v0.  Assume that the medium through which the sound waves travel is at rest. If v is the velocity of sound and n is the frequency emitted by the source, then the difference between apparent frequencies heard by the observer is,
MEDIUM
JEE Main
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 20 - JEE Main & Adv./BITSAT/KERALA CEE/KCET AP & TS EAMCET/VIT/MHT CET>SOLVED PAPERS 2017>Q 24
A metal rod of length L and cross-sectional area A is heated through T °C. What is the force required to prevent the expansion of the rod lengthwise?