A typical hand-held torch runs off two 1.5V cells yet has a lamp rated at 2.5V,0.5A.Explain how the potential difference across the lamp can actually be 2.5V as rated
A 2kg hammer with a speed of 40m/s strikes a 100g nail driving it into a wooden block. If there is no dissipation of energy in this process and the frictional force applied by the wooden block is 8000N, how deep would be nail penetrate into the block?
The video project was given in 2008 for XI class students of Meghalaya. The best video among them is posted here. Though there are some errors, the video is inspiring to note the work done entirely from scratch by the XI Class students.