numericals physics

01. A body of mass 2kg is raised to a height of 25m. Calculate the potential energy possessed by the body. Solution: Mass of the body (m) = 2kg Height (h) = 25 m Potential energy of the body = mgh 02. A bag of rice weighs 75kg. To what height is it raised if the work done in lifting it is 4900 J. S..

01. A man of mass 60 kg runs up a flight of 60 steps in 40 seconds. If each step is 20 cm high, calculate his power. Solution: Since the man runs up a flight of steps, the work done will be equal to the potential energy. Height = height of one step x number of ste..

down the dimensional formula of this constan..

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Determine the radius of the first orbit of the hydrogen atom. What would be the velocity and frequency of the electron in the first orbit? Given: h = 6.62 x 10 - 3 4 Js, m = 9.1 x 10 - 3 1 kg, e = 1.6 x 10 - 1 9 C, k = 9 x 10 9 N m 2 C - 2..

Calculate the ionisation potential for a lithium at..

Using the Rydberg formula, calculate the wavelengths of the first four spectral lines in the Balmer series of the hydrogen spectru..

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..

Determine the half life of a radioactive materia..