class 8 physics

A nucleus of UX 1 has a half life of 24.1 days. How long a sample of UX 1 will take to change 90% of it to UX 2..

Elastic bodies regain their original shape due to internal restoring forces. This internal restoring force, acting per unit area of a deformed body, is called a stress. An object can be deformed in different wa..

The rate of flow of charges is known as electric current or in other words the magnitude of the current I is the charge flowing in the circuit in one second. Mathematically, where 'Q' is charge and 't' stands for ti..

W = F x s SI unit of F is N and that of s is m [N=Newton] 1Nm is defined as 1 joule. i.e., 1 joule = 1..

= 1.13 x 10 8 m ..

Mass of copper to be deposited = 0.254 kg Current, I = 100 A; F = 96500 C Relative atomic mass of Cu = 63.5; Time, t=? Charge required, q = 8 F = 8 x 96500 C = 7720 s or 2.14h or 2h 8 min 24 s ..

Differentiating equation (1.7) with respect to x, We get, The velocity of the particle whose displacement y is represented by equation (1.7), is obtained by differentiating it with respect to t, since velocity is the rate of change of displacement with respect to time. Comparing equations (1..

The orbital velocity can be calculated taking g = 9.8 ms - 1 and R = 6.4 x 10 6 m v = 7.9 x 10 3 ms -..

Eight charges having the values shown in figure are arranged symmetrically on a circle of radius 0.4 m in air. Calculate the potential at the centre O. ..

When free space is the communication channel, antennas radiate and receiver the signal. Theory shows that the antennas operate effective only when their dimensions are of the order of the magnitude of wavelength of the signal being transmitted...