A stone is dropped into a well, 44.1 m deep. The sound of the splash is heard 3.13 s after the stone is dropped. Find the velocity os sound in air .
The radius of the earth is about 6400 km and that of mars is about 3200 km . The mass of the earth is about 10 times the mass of mars. If an object weigh 200 Newton on earth's surface , then wht will be it's surface on the mars?
A sharp knife is more effective than a blunt knife.why?
how many moles are there in each one of the following?
(A)19.0 atoms of fluorine.
(B) 280 g of silicon
Z = 3, what would be the valency of the element? Also, name
Why Newton's law of gravitation called universal law
the kE acquired by a mass m in travelling a certain distance s ,starting from rest ,under the action of a constant force is directly proportional to:
d)none of these
happens to the force between two objects, if
mass of one object is doubled?
distance between the objects is doubled and tripled?
masses of both objects are doubled?
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