Recent content by helpphysics

Hello, can you be bit more explanatory? i am not getting anything !

Homework Statement Anyway can you please help me out with the following? 240V , 50 Hz electrical appliance is rated at 2 kW. It has a lagging power factor of 0.7 (a) What is appliances power factor when it is used on a 60Hz supply. (b) What is supply voltage required to maintain...

Anyway can you please help me out with the following? 240V , 50 Hz electrical appliance is rated at 2 kW. It has a lagging power factor of 0.7 (a) What is appliances power factor when it is used on a 60Hz supply. (b) What is supply voltage required to maintain appliance at its rated power...

Sorry mate. No more info has been given. Don't worry you are not the only one going nuts over this. Physics is a hard nut! :-p

i am sorry i am not getting it i just know that emf = A*∂B/∂t & thus 2R = A*∂B/∂t

Homework Statement 200-turn,coil of 8.0cm length is made of 0.50mm-diameter copper wire. Magnetic field is perpendicular to coil. At what rate B should increase to induce a 2.0 A current in the coil? Homework Equations The Attempt at a Solution i am not getting anthing

Thanks for your help. That worked nicely :biggrin:

Homework Statement Boy throws a shotput at angle of 45Degree which travels a horizontal distance of 30m If he releases same shotput at same speed but changes angle to 55 Degree, what will be the new range or distance? A) 25m B)41m C)28m D)37m E)32. m Homework Equations That's what i...

Thanks mate. You really explained me the concept behind it too Thanks once again. yoyo !

Kindly let me know the formula concept and i will calculate myself. I am really not getting it. Thanks in advance

Homework Statement A fisherman in a stream 20 cm deep looks downward into the water of stream and sees a rock on the stream bed. How deep does the stream appear to the fisherman? Homework Equations We Assume that the index of refraction of the water is 1.33. The Attempt at a...