Question

1 state universal law of gravitation. write the formula to find the magnitude of the gravitational force between any two object in the universe .
2 a train starting from a railway station and moving with uniform acceleration attains a speed of 40 km per hour and 10 minutes. find its acceleration .
3 derive the relation between wavelength , wave velocity and frequency of sound .
4 a stone dropped into a well 44m Deep and the sound of splash is heard after 3.12 second. find the speed of sound in air .
5 a disused railway line has a length of 300 m. a man puts his ear against one of the rail and another man hits the other end with a metal hammer. answer the following:
(a) state an approximate value for the speed of sound in air.
(b) sound Travels at 5000 metre per second in steel .calculate the time it takes for the sound to travel along the rails.
(c) In which of the three media sound Travels faster at a particular temperature?

Answer 1

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