21st of March 2017

1. 1.A dish of mass 10g is kept floating horizontally in air by firing bullet, each of mass 5kg , with the same velocity, at the rate of 10 bullet per second and the bullet rebound with the same speed in opposite directions . What the velocity of each bullet at the time of impact? [ Take g = 10m s-2 ] 2.The supply voltage to a room is 120 V. The resistance of lead wire is 6ohm. A 60W bulb is already switched on. What is the decrease of voltage across the bulb, when a 240 W heater is switched on in parallel to the bulb? [ Take Rated voltage = 120 V]?


Sahil Kumar Sahoo - CBSE - Class X

Tuesday, March 21, 2017 at 17:57:PM


Hi, Sahil!

These in-depth queries require an elaborate solution that is provided by us at our 'Ask the Expert'

Please post these queries as two separate questions at 'Ask the Expert'.

Tuesday, March 21, 2017 at 18:08:PM