The sun's angular diameter is measured to be 1920. The distance r of the sun from the earth is \(1.496\times { 10 }^{ 11 }\) m. What is the diameter of the sun?

Write down the number of significant figure in the following.
0.060

A drop of olive oil of radius 0.25 mm spreads into a circular film of radius 10 cm on the water surface. Estimate the molecular size of olive oil.

The refractive index of water is found to have the values 1.29,1.33,1.34,1.35,1.32,1.36,1.30 and 1.33.Calculate mean absolute error

The refractive index of water is found to have the values 1.29,1.33,1.34,1.35,1.32,1.36,1.30 and 1.33.Calculate fractional error

Find an expression for viscous force F acting on a tiny steel ball of radius r moving in a viscous liquid of viscosity \(\eta \) with a constant speed v by the method of dimensional analysis.

The diameter of a wire as measured by a screw gauge was found to be 1.328, 1.330, 1.325, 1.334 and 1.336 cm. Calculate mean absolute error.

The diameter of a wire as measured by a screw gauge was found to be 1.328, 1.330, 1.325, 1.334 and 1.336 cm. Calculate fractional error.

To determine acceleration due to gravity, the time of 20 oscillations of a simple pendulum of length 100 cm was observed to be 40 s. Calculate the value of g and maximum percentage error in the measured value of g.

Obtain a relation between the distance travelled by a body in time t, if its initial velocity be u and acceleration f.

The Reynold's number n_R for a liquid flowing through a pipe depends upon:
(i) the density of the liquid p,
(ii) the coefficient of viscosity n 
(iii) the speed of flow of the liquid v, and
(iv) the radius of the tuber