Al interval (B) Answer the following questions.
1. What is inertia? Write down the relation between mass and inertia?
It is the
orkoms
motion
The inertia
sto be in
external
led law
2. What is acceleration? What would be the acceleration in a body
moving with uniform velocity and why?
3. State Newton's first law of motion and write down any three
examples to justify it.
4. State Newton's second law of motion and prove F = ma
5. Newton's first law of motion is also called the law of inertia, why?
Clarify your answer.
6. An electric fan continues in its motion even after the switch is put
off, why?
7. Dust particles fall down when a carpet or a piece of cloth is beaten
by a stick, why?
8. While swimming a person pushes water backward, why?
9. A cricket player catches the ball leaning towards to the ground, why?
10. Prove that s = ut +1/2 at-
11. State Newton's third law of motion and write any three
applications of it.
12. Prove that vi= u+ 2as.
Loed on
versely
Jual but

In a thunderstorm, charge builds up on the water droplets or ice crystals in a cloud. thus, the charge can be considered to be distributed uniformly throughout the cloud. for the purposes of this problem, take the cloud to be a sphere of diameter 1.00 kilometer. the point of this problem is to estimate the maximum amount of charge that this cloud can contain, assuming that the charge builds up until the electric field at the surface of the cloud reaches the value at which the surrounding air breaks down. this breakdown means that the air becomes highly ionized, enabling it to conduct the charge from the cloud to the ground or another nearby cloud. the ionized air will then emit light due to the recombination of the electrons and atoms to form excited molecules that radiate light. in addition, the large current will heat up the air, resulting in its rapid expansion. these two phenomena account for the appearance of lightning and the sound of thunder. take the breakdown electric field of air to be eb=3.00ă—106n/c. part a estimate the total charge q on the cloud when the breakdown of the surrounding air is reached. express your answer numerically, to three significant figures, using ďµ0=8.85ă—10â’12c2/(nâ‹…m2) .

Awave travels at a speed of 5.2 m/s. if the distance between crests is 0.40 m, what is the frequency of the wave? use f=v/wavelength a. 13 hz b. 2.1 hz c. 0.077 hz d. 5.6 hz

The number of passengers who arrive at the platform of a subway station for the 10 am train is a random variable with a mean of 120 and a variance of 16. find the lower bound of the probability that there will be between 100 and 140 passengers (round off to second decimal place).