`0.4(3x –1) = 0.5x +

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asked Jan 18, 2022 in 8th-maths by uday (1.6k points)

`0.4(3x –1) = 0.5x + 1`

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Given below are some functions of x and t to represent the displacement (transverse or longitudinal) of an elastic wave. State which of these represent (i) a travelling wave, (ii) a stationary wave or (iii) none at all: (a) y = 2 cos (3x) sin (10t) (b) `y = 2sqrt(x-vt)` (c) y = 3 sin (5x – 0.5t) + 4 cos (5x – 0.5t) (d) y = cos x sin t + cos 2x sin
`0.16 (5x – 2) = 0.4x +
`3 (5x – 7) + 2(9x – 11) = 4(8x – 7) –
A 100 turn rectangular coil ABCD (in XY plane) is hung from one arm of a balance (Fig). A mass 500g is added to the other arm to balance the weight of the coil. A current 4.9 A passes through the coil and a constant magnetic field of 0.2 T acting inward (in xz plane) is switched on such that only arm CD of length 1 cm lies in the field. How much additional mass ‘m’ must be added to regain the
The value of x for which the expressions 3x – 4 and 2x + 1 become equal