Question
Which of the following statement is correct?
>I. Speed of sound in steel is more than the speed of sound in glass. II. Speed of sound in brass is more than helium.Solution
Solids and liquids have higher mass densities (r) than gases. But the corresponding increase in both the modulus (B) of solids and liquids is much higher. The speed of the sound in Steel is 5941 (m s-1) The speed of the sound in Brass is 2,120 (m s-1) The speed of the sound in Helium is 965 (m s-1) Â
tan 20Ëš x tan 23Ëš x tan 67Ëš x tan 70Ëš = ?
If 0 ≤ θ ≤ 90°, and sin(2 θ +50°) = cos (4 θ + 16°), then what is the value of θ (in degrees)?
If cos θ + sec θ = √2, then the value of cos³ θ+ sec³ θ is:
If sec a + tan a = 3/2, find the value of sin a.Â
A tree of height 'h' metres is broken by storm in such a way that its top touches the ground at a distance of 'x' metres from t...
If cos 2A = 7, then find cos A
Find the value of `1/2`  cosec 10  - `2/(cosec 70)`  ?
- If sin 2a = (3/4), then find the value of (sin a + cos a).
If tan A = 1, then what will be the value of sec² A + cosec² A?
