Physics
A crane 'A' lifts a heavy load in 5 seconds, whereas another crane 'B' does the same work in 2 seconds. Compare the power of crane 'A' to that of crane 'B'.
Related Questions
Give one example of each when:
(i) Chemical energy changes into electrical energy.
(ii) Electrical energy changes into sound energy.
A ray of light falls normally on a rectangular glass slab. Draw a ray diagram showing the path of the ray till it emerges out of the slab.
(i) Identify the class of the lever shown in the diagram below:
(ii) How is it possible to increase the M.A. of the above lever without increasing it's length?
Complete the path of the monochromatic light ray AB incident on the surface PQ of the equilateral glass prism PQR till it emerges out of the prism due to refraction.
