Home » doubt
Category Archives: doubt
What is centripetal force?
What is centripetal force?
Received via SMS from our mobile version of this site http://m.askphysics.com
Answer
Centripetal fforce is the net force to be acting on a body so that it can move in a curved path. The centripetal force is always directed towArds the center of the circular path. The word centripetal means “directed towards the center” or “center seeking force”.
Please remember that it is not a new kind of force, but in different case one or more of the fundamental forces or their components provide the necessary centripetal for e.
The magnitude of the centrifugal force that must be acting on a body of mass m moving with a speed v along a curve of radius of curvature r is given by F = mv^2/r
Share the knowledge
Bouncing ball and energy dissipation problem
Please help me with the question below.. I’m totally confused!
A player throws a ball of mass 0.6 kg into the air, to a height of 4.0 m above the ground. The ball then falls to the ground. During the impact, 22% of the ball’s energy is lost. Calculate the height to which the ball rises after the bounce. Your assistance will be appreciated..
Mustafa posted
Answer:
m= 0.6 kg
h = 4.0 m
Energy = mgh
During impact 22% energy is lost. Therefore, energy remaining = 88%
Therefore the energy with which the ball rebounds = 24 x 88/100 J
This is equal to the potential energy at the highest point after bouncing
If the new height is h’
mg h’ = 88% mgh
h’ = 0.88 x h = 0.88 x 4.0 =3.52 m
If you have further doubts, please ask
Related articles
- Calculate velocity and direction of a ball to ball collision based on mass and bouncing coefficient (stackoverflow.com)
- Rainfall Dissipates Energy via Friction with Air (scientificamerican.com)
Share the knowledge
Momentum and Kinetic Energy
How it is possible to double the momentum of a body by increasing the kinetic energy four times?at the time what happen to mass?
Answer:
When we say, KE is increased, we mean to say by increasing speed alone unless otherwise specified.
Here mass remains constant.
Please note that the question says, KE of a body increased 4 times; which suggests that the body is the same and KE is increased by increasing the speed alone.
Share the knowledge
Physics Masters
Vivek Sawhney
AskPhysics Q&A
- Answered: How Quantum Field Theory explains triboelectricity?
- Answered: which theory state that every molecule of magnetic substance is a tiny magnet
- Answered: Why machine get jammed in winter?
- Answered: what is a laser?
- What do you mean by reversible and irreversible process
- Why do we Study electric field along axial line?
- Important topics to study for NEET Physics
- What are the most important topics in JAM Physics?
- If the size of the unit decreases by 20% the% change in the numerical value is
- Why is easier to hammer a sharp nail into wood than a blunt one?
You must be logged in to post a comment.