Natural Resources — Science STD 9 — Question

A motorcycle moving with a speed of 5m/s is subjected to an acceleration of 0.2m/s². Calculate the speed of the motorcycle after 10 seconds, and the distance travelled in this time.

Amit buys few grams of gold at the poles as per the instruction of one of his friends. He hands over the same when he meets him at the equator. Will the friend agree with the weight of gold bought? If not, why?
[Hint: The value of g is greater at the poles than at the equator.]

Why is a liquid (the hydraulic fluid) used to operate the brakes in a car?

A force of 20N acts upon a body whose weight is 9.8N. What is the mass of the body and how much is its acceleration? (g = 9.8ms^-2).

An object is immersed in three different liquids. Will it experience same buoyant force due to all the liquids?

If the mass of a body and the force acting on it are both doubled, hat happens to the acceleration?

A certain household consumes 650 units of electricity in a month. How much is this electricity in joules?

Which quantity should be varied if momentum of a body of given mass needs to be changed?