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Each of three blocks P, Q and R shown in figure
has a mass of 3 kg. Each of the wire A and B has
cross-sectional area 0.005 cm2 and Young’s
modulus 2 × 1011 N m–2. Neglecting friction, the
longitudinal strain on wire B is _____ × 10–4
(Take g = 10 m/s2
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Frequently Asked Questions
How to prepare for IIT-JEE Physics?
To prepare for IIT-JEE Physics, focus on understanding concepts rather than memorizing formulas. Practice solving a variety of problems, especially previous years’ questions. Create a study schedule that covers all topics, with extra time for challenging areas like Mechanics and Electromagnetism. Regular revision and mock tests are essential for success.
What is the Doppler effect?
The Doppler effect is the change in frequency or wavelength of a wave for an observer moving relative to the source of the wave. When the source moves toward the observer, the frequency increases (wavelength decreases). When the source moves away, the frequency decreases (wavelength increases). This effect explains why the pitch of a siren changes as it passes by.
How to effectively solve physics numerical problems?
To solve physics numerical problems effectively, first understand the concept thoroughly. Then follow these steps: 1) Read the problem carefully and identify the given quantities and what needs to be found. 2) Draw a diagram if applicable. 3) Write down the relevant formulas. 4) Substitute the values with proper units. 5) Solve step by step. 6) Verify your answer by checking units and whether the result makes physical sense.
