Advertisements
Advertisements
प्रश्न
A bullet of mass 30 g, and moving with a velocity x hits a wooden target with a force of 187.5 N. If the bullet penetrates 80 cm, find the value of x
Advertisements
उत्तर
Mass of bullet = m = 30 g = `30/1000` kg = 0.03 kg
Force = F = 187.5 N
Acceleration = a = ?
Acceleration = a = `-"F"/"m"` ........[because of retardation]
a = `-187.5/0.03`
= `-18750/3` = −6250 ms−2
Initial velocity = u = x
Final velocity = v = ?
Distance covered by bullet = S = 80 cm = `80/100` m
S = 0.8m
v2 – u2 = 2aS
(0)2 – (x)2 = 2 × (–6250) × 0.8
–x2 = –10000
x2 = 10000
x = `sqrt10000` = 100 ms–1
APPEARS IN
संबंधित प्रश्न
A boy pushes a wall with a force of 10 N towards east. What force is exerted by the wall on the boy?
Explain the meaning of the following statement '1 kgf = 9.8 N'.
State the unit of weight in CGS system.
Does a body weigh the same at all places of the Earth? Give a reason for your answer.
A man weigh 800 N at the equator. How does the weight of man change at the following place?
At poles
How is weight affected in the following case, when initially the body is weighed in Delhi with a spring balance?
Body is taken to Moscow.
The value of G is extremely____________.
Does the force of gravitation between two objects depend on the medium between them?
Name the instrument used to measure the weight of a body.
In the below figure, a block of weight 20 N is hanging from a rigid support by a string. Find:
The force exerted by string on the block.
