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Anirban S.

Physics tutor for 5 years

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Physics (Electricity and Magnetism)

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Question:

During a thunderstorm, a lightning has struck your car. Is it advisable to leave the car and run or stay inside it?

Anirban S.

Answer:

If lightning had struck your car, there will be charges accumulated. Now, we know that the body of the car will behave as a conductor. Charges always reside on the surface of the conductor and hence, there will be charges on the body of the car. In case, we want to open the door and run, the potential difference developed will cause charges to flow through our body, which can kill us. So, it is always advisable to sit inside the car in such a situation.

Algebra

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Question:

A rectangular field has a perimeter of 104 meters. The length of the field is 12 meters more than its width. Find the length and the width of this field.

Anirban S.

Answer:

Let the length of the field be l and its breadth be b. Given, perimeter of the field = 2(l + b) = 104 m Also, we have l = 12 + b So, we have two linear equations and two variables. We solve them to get the value of l and b. Substituting l from the second equation into the first equation, we will have $$\begin{equation} 12+2b = 52\end{equation}$$ $$\begin{equation} \implies b = 20\end{equation}$$ Pluuging this in the second equation, we get l = 32 Hence, the length and breadth of the rectangular field is 32m and 20m respectively.

Physics

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Question:

Suppose you drop a feather and a stone from the top of a tower, which will reach the ground first?

Anirban S.

Answer:

If we neglect forces due to resistance, in both the cases, the force on the body is due to gravity. According to Newton's law, the force on the body is F=mg. Hence, acceleration g is same for both feather and a stone. So, using equation of motion $$t=\sqrt{\frac{2h}{g}}$$. Since h is same for both, the feather and the stone will reach at the same time. This is possible only when frictional or velocity-dependent forces are not present

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