The high-tensile steel used to support the roadway of a suspension bridge breaks under a stress of 2 x 109Pa. Find the minimum cross-sectional area for a cable if it is to support a load of mass 2 x 105kg.
A snooker ball moving with velocity v collides head on with another snooker ball of same mass at rest. If the collision is elastic, the velocity of second snooker ball is
If the acceleration due to gravity at the earth's surface is 9.8 m/s2 and the mass of the earth is 80 times that of moon and radius of earth 4 times that of moon,the value of G at the moos's surface will be:
A whistle is revolved with high speed in a horizontal circle of radius R. to an observer at the centre of the circle the frequency of the whistle will appear to be:
In a spectrometer experiment monochromatic light is incident normally on a diffraction grating having 4.5 x 105 lines per meter.The second order line is seen at an angle of 30 to the normal what is the wavelength of the light?
The length breadth and thickness of a block are given by 1= 12 cm b= 6 cm and t= 2.45 cm.the volume of the block according to the idea of significant figures should be:
On the ground the gravitational force on a satellite is W. What is the gravitational force on the satellite when at a height R/50,where R is the radius of the Earth
The cables holding a passenger lift swap and lift falls freely towards the ground. A person inside the lift is standing on a weighing machine. What does he notice?
If source and observer are moving towards each other with same speed and aftercrossing they are
receding each other then frequency observed by observer:
