In the electrolysis of acidulated water, it is desired to obtain hydrogen at the rate of 1cc per second at STP conditions. What should be the current passed?

Nazima is fly fishing in a stream. The tip of her fishing rod is 1.8 m above the surface of the water and the fly at the end of the string rests on the water 3.6 m away and 2.4 m from a point directly under the tip of the rod. Assuming that her string (from the tip of her rod to the fly) is taut, how much string does she have out ? If she pulls in the string at the rate of 5 cm per second, what will the horizontal distance of the fly from her after 12 seconds ? .

The apparent depth of water in cylindrical water tank of diameter 2 R cm is reducing at the rate of x cm //min when water is being drained out at a constant rate .The amount of water drained in c.c. per minute is (mu_(1) = refractive index of air, mu_(2) = refractive index of water)

Assuming that the charge of an electron is 1.6 xx 10^-19C , the number of electrons passing through a section of wire per second, when the wire carries a current of 1 A is

H_2 (g) and O_2 (g), can be produced by the electrolysis of water. What total volume (in L) of O_2 and H_2 are produced at 1 atm and 273K when a current of 30 A is passed through a K_2SO_4 (aq) solution for 193 min?

The diode used in the circuit shown in the adjacent figure has a constant voltage drop of 0.5V at all currents and a maximum power rating of 100mW.What should be the value of resistor R connected in series with the diode for obtaining maximum current?

A machine gun of mass 20 kg fires 35 gram bullet at the rate of 50 bullets per second with a speed of 400 m s^-1 . What force must be applied to the gun to keep it in position?

The magnetic flux passing perpendicular to the plane of the coil and directed into the paper is varying according to the relation phi=6t^2 +7t+1 Where phi is in milliweber and t is in seconds. What is the direction of current through resistor R?

It is desired to pass only 5% of the current through a galvanometer of resistance 95Omega . What shunt resistance should be connected across it ?

What mass of zinc can be produced by the electrolysis of zinc sulphate solution when a current of 1.5 amperes is passed for 15 minutes ? The atomic mass of zinc=65.4 amu.