Question

Q.21 Two equal vectors have their resultant equal to either. Find angle between two vectors.
OR
A man can swim with speed of 4 km/h in still water. How long does he take to cross a river 1km wide
the river flows steadily at 3km/h and he makes his strokes normal to the river current? How far the
river does he go when he reaches on other bank?
Q.22 Discuss motion of a body in vertical circle & find minimum velocity required at lowest point for looping
of loop.
Q.23 An electron and proton are detected in cosmic ray experiment the first with Kinetic energy 10 Kev and
the second with 100Kev. Which is faster, the electron or proton?
me = 9.1 X10-31 kg mp = 1.67 X 10-27 kg
2.24 Derive 'expression for Gravitational Potential' at a point.
W.25 At what height acceleration due to gravity is reduced by 36% of its value at the surface of earth?
2.Zo prove that Cp - CV =R, R - gas constant Cp & Cv are specific heat at constant Pressure & volume​

Answer 1

Explanation:

English and Chemistry done??