For two resistance wires joined in parallel, the resultant resistance is 6/5 ohm. When one of the resistance wire breaks, the effective resistance becomes 2 ohm. The resistance of the broken wire is
By which velocity a ball be projected vertically so that the distance covered by it in 5th seconds is twice the distance it covers in its 6th second ( g=10m/s2)
Two monochromatic radiations X and Y are incident normally on a diffraction grating.The second order intensity maximum for X coincides with the third order intensity maximum for Y what is the ratio wavelength of X/wavelength of Y?
Suppose the water flows out from a pipe at 3 kg s-1and its velocity changes from 5m s-1to zero on striking the wall, the force exerted by water on wall will be
A metal ball hangs from a spring balance which is placed on the wall of an elevator under freefall. Why does the spring balance show a weight of o(zero)N?
