The size of the image of an object by a mirror having a focal length of 20 cm is observed to be reduced to 1/3 rd to its size. At what distance, the object has been placed from the mirror?
An ideal gas (γ = 1.5) is expanded adiabatically. How many times has the gas to be expanded to reduce the root mean square velocity of molecules 2.0 times
A metal wire has diameter of 0.25 mm and electrical resistivity of 0.8 ×10-8 Ω-m. The length of this wire required to make a resistance of 5 is [[1]] m.
A copper calorimeter of mass 1.5 kg has 200 g of water at 250C. How much water (approx.) at 500C is required to be poured in the calorimeter, so that the equilibrium temperature attained is 400C? (Sp. heat capacity of copper = 390 J/kg- 0C)
A sample of a liquid has an initial volume of 1.5 L. The volume is reduced by 0.2 mL, when the pressure increases by 140 kPa. What is the bulk modulus of the liquid?
Planck’s constant h speed of light in vacuum c and Newton’s gravitational constantG are three fundamental constants. Which of the following combinations of these has the dimension of length?
