Advertisements
Advertisements
प्रश्न
Why does a sharp knife cut objects more effectively than a blunt knife ?
Advertisements
उत्तर
The area under the sharp knife is less than the area under the blunt knife. Hence, the pressure exerted by the sharp knife is more than the pressure exerted by the blunt knife on an object. Therefore, when a same amount of force is applied on both the knives, the sharp knife penetrates deeper into the object than the blunt knife.
APPEARS IN
संबंधित प्रश्न
What do you mean by free fall?
A stone is allowed to fall from the top of a tower 100 m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25 m/s. Calculate when and where the two stones will meet.
A ball thrown up vertically returns to the thrower after 6 s. Find
- the velocity with which it was thrown up,
- the maximum height it reaches, and
- its position after 4 s.
During a free fall, will heavier objects accelerate more than lighter ones ?
Explain why, if a stone held in our hand is released, it falls towards the earth.
For freely falling object we can write the Newton’s second equation of motion as …..
Write scientific reasons.
The value of gravitational acceleration (g) decreases as we go deep inside the earth.
The mass of planet ‘X’ is four times that of the earth, and its radius is double the radius of the earth. The escape velocity of a body from the earth is 11.2 × 103 m/s. Find the escape velocity of a body from the planet ‘X’.
Write a short note.
Escape Velocity
When is free fall possible?
