You are travelling in a car during a thunderstorm. In order to protect yourself from lightning, you should prefer to

You are travelling in a car during a thunder storm. In order to protect yourseft from lightening, would you prefer to :

During a thunderstorm, the sound of a thunder is heard after the lightning is seen. Why?

How does a lightning conductor protect buildings from lightning?

By the term velocity of rain, we mean velocity with which raindrops fall relative to the ground. In absence of wind, raindrops fall vertically and in presence of wind raindrops fall obliqucly. Moreover raindrops acquire a constant terminal velocity due air resistance very quickly as they fall toward the carth. A moving man relative to himself observes an altered velocity of raindrops. Which is known as velocity of rain relative to the man. It is given by the following equation. vec(v)_(rm)=vec(v)_(r)-vec(v)_(m) A standstill man relative to himself observes rain falling with velocity, which is equal to velocity of the raindrops relative to the ground. To protect himself a man should his umbrella against velocity of raindrops relative to himself as shown in the following figure. When you are standstill in rain, you have to hold umbrella vertically to protect yourself. (a) When you walk with velocity 90 cm/s, you have to hold your umbrella at 53^(@) above the horizontal. What is velocity of the raindrops relative to the ground and relative to you ? (b) If you walk with speed 160 cm/s, how should you hold your umbrella ?

What are the safety measures you need to take during lightning?

The thunder is heard during a thunderstorm three seconds after sound is 342 m/s, find the distance at which lightning took place.

While travelling back to his residence in the car, Dr. Pathak was caught up in a thunderstorm. It became very dark. He stopped driving the car the waited for thunderstom to stop. Suddenly he noticed a child walking alone on the road. He asked the boy to come inside the car till the thunderstorm stopped. Dr. Pathak dropped the boy at his residence. The boy insisted that Dr. Pathak should meet hsi parents. The parents expressed their gratitude to Dr. Pathak for his concern for safety of the child. Answer the following questions based on the above information: (a) Why is it safer to sit inside a car during a thunderstorm? (b) Which two values are displayed by Dr. Pathak in his actions? (c ) Which values are reflected in parents response to Dr. Pathak ? (d) Give an example of a similar action on your part in the past from everyday life.

The speed-time graph for a car is shown is Figure (a) Find how far does the car travel in the first 4 seconds. Shade the area on the graph that represents the distance travelled by the car during this period. (b) Which part of the graph represents uniform motion of the car ?

Can you accelerate a car on a frictionless horizontal road by putting more petrol in the engine? Can you stop a car going on a frictionless horizontal road by applying brakes?

You are given a solution of an alkali. In order to estimate its concentration in terms of normality , you need to know