A bomb of mass 12 kg initially at rest explodes into two pieces of masses 4 kg and 8 kg.The speed of the 8 kg mass is 6 ms-1,The K.E of the 4 kg mass is
A man sitting in a bus traveling in a direction from west to east with a speed of 40 km/h observes that the rain-drops are falling vertically down.To the another man standing on ground the rain will appear
A ball falls on the surface from 10 m height and rebounds to 2.5 m.If the duration of contact with the floor is 0.01 seconds then the average acceleration during contact is
The two electric charges originally 8 cm apart are brought closer together, until they are 2 cm apart the force between them is now greater by a factor
The object is placed at the principle focus of a simple microscope if the focal length of the lens is 2cm what is the magnifying power of the microscope
The initial velocity of a body moving along a straight line in 7 m/s.It has a uniform acceleration of 4 m/s2.The distance covered by the body in the 5th second of its motion is
In Michelsion's interferometer, if a dark fringe is seen in the beginning, the next dark fringe will appear by moving the moveable mirror through a distance
The sum of the magnitude of two forces acting at a point is 18 and the magnitude of their resultant is 12.If the resultant is at 90Β° with the force of the smaller magnitude then their magnitudes are:
If a planet exists whose mass is twice that of the earth and whose radius is three times that of the earth, a1 kg mass on its surface would weight about
