A student, weighing 45 kg, is running with a speed of 8 km per hr on a foot path 2m wide. A small car, weighing 1200 kg, is moving with a speed of 60 km per hr on a 20 m wide road. Calculate their de Broglie wavelengths.

Calculate the de Broglie wavelength of proton, if it is moving with a speed of 2 xx 10^5 m//s .

A uniform wire of length 20 m and weighing 5 kg hangs vertically. The speed of transverse wave in the middle of the wire is (g = 10 m//s^2)

A car moving along a straight road with a speed of 120 km//hr is brought to rest by applying brakes. The car covers a distance of 100 m before it stops. Calculate (i) average retradation of the car. (ii) time taken by the car to come rest.

A car moving along a straight road with a speed of 120 km/hr, is brought to rest by applying brakes. The car covers a distance of 100 m before it stops. Calculate (i) the average retardation of the car (ii) time taken by the car to come to rest.

From the same place at 7 a.m. A started walking in the north at the speed of 4 km//hr . After 1 hours B stated cycling in the east at a speed of 8 km//hr . At what time they will be at a distance of 20 km apart from each other?

A women weighing 600 N is sitting in a car which is travelling at a constant speed on a straight road. The car suddenly goes over a humb in the road (humb may be regarded as an arc of a circle of radius 12.1m) . If the women experiences weightlessness, calculate the speed of the car. [Take g=10 m//s^2 ]

A plane is in level flight at constant speed and each of its two wings has an area of 20m^(2). If the speed of the air is 180 km/h over the lower wing and 216 km/h over the upper wing surface, determine the plane's mass. (Take air density to be 1 kg m ^(-3) and g= 10m//s ^(2)).

Two cars are moving on two perpendicular roads towards a crossing with uniform speeds of 72 km/hr and 36 km/hr. If first car blows horn of frequency 280 Hz, then the frequency of horn heard by the driver of second car when line joining the cars make 45^@ angle with the roads will be

A beam 4 m long, 50 cm wide and 20 cm deep is made of wood, which weighs 25 kg per m^3 . Find the weight of the beam.

A car is moving at a speed of 60 km//h traversing a circular road track of radius 60,m. The minumum coefficient of friction to prevent the skidding of the car is (g=10 m//s^2 )