Advertisements
Advertisements
प्रश्न
A ball falls off a table and reaches the ground in 1 s. Assuming g=10 m/s2, calculate its speed on reaching the ground and the height of the table.
Advertisements
उत्तर
1) Velocity on reaching the ground
v = u + gt
v = final velocity
u = initial velocity
t = time
g = gravitational acceleration.
Doing the substitution we have :
v = 0 + 10 × 1 = 10 m/s
= 10 m/s
2) The height of the table
S = ut + 1/2gt²
Doing the substitution we have :
S = 0 × 1 + 1/2 × 10 × 1
s = 0 + 5
= 5 meters
APPEARS IN
संबंधित प्रश्न
What do you mean by acceleration due to gravity?
Explain why, if a stone held in our hand is released, it falls towards the earth.
What is the force of gravity on a body of mass 150 kg lying on the surface of the earth? (Mass of earth = 6 x 1024 kg; Radius of earth = 6.4 x 106 m; G = 6.7 x 10-11 Nm2/kg2)
What is the usual value of the acceleration due to gravity of earth ?
Why does a sharp knife cut objects more effectively than a blunt knife ?
Explain why, the tip of a sewing needle is sharp.
Name the force which wears away two surfaces as they move over one another.
Name the force which stops you falling through the floor.
An object thrown vertically upwards reaches a height of 500 m. What was its initial velocity? How long will the object take to come back to the earth? Assume g = 10 m/s2
i) If g = GM/r2 then where will the value of g be high at Goa Beach or on top of Mount Everest?
For freely falling object we can write the Newton’s second equation of motion as …..
What would be the value of ‘g’ on the surface of the earth if its mass was twice and its radius half of what it is now?
The total energy of an object falling freely towards the ground ______.
A force acts for 0.1 s on a body of mass 2.0 kg initially at rest. The force is then withdrawn and the body moves with a velocity of 2 m s-1. Find the magnitude of the force.
How is the acccelaration due to gravity on the surface of the earth realted to its mass and radius ?
An object falling freely from rest reaches ground in 2 s. If acceleration due to gravity is 9.8 m s-2, then the velocity of object on reaching the ground will be
Explain why:
Objects fall to the earth.
The value of gravitational acceleration at the centre of earth is zero.
Write scientific reason.
The value of gravitational acceleration (g) decreases as we go deep inside the earth.
The mass and weight of an object on earth are 5 kg and 49 N respectively. What will be their values on the moon? Assume that the acceleration due to gravity on the moon is 1/6th of that on the earth.
