A tennis ball is hit into the air with a racket. when is the ball’s kinetic energy the greatest? ignore air resistance.
1 answer:
When the player strikes the ball, kinetic energy is at its greatest.
Kinetic energy = 1/2*m*
where m denotes mass and v denotes velocity.
Therefore, kinetic energy is inversely correlated with square of velocity.
When a player strikes the ball, velocity is at its highest.
Thus, when the player strikes the ball, kinetic energy is at its highest.
<h3>What is kinetic energy?</h3>It is the energy that a body has because it is moving.
<h3>Which 5 forms of kinetic energy are there?</h3>Kinetic energy comes in five different forms:
- radiant
- thermal
- sound
- electrical
- mechanical.
Kinetic energy is measured in Joules.
Importance of kinetic energy:
- The capacity to perform work is kinetic energy's most significant quality.
- Force acting on an object while it is moving is referred to as work.
- Energy and work are interchangeable because of their tight relationship.
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Answer
Given,
refractive index of film, n = 1.6
refractive index of air, n' = 1
angle of incidence, i = 35°
angle of refraction, r = ?
Using Snell's law
n' sin i = n sin r
1 x sin 35° = 1.6 x sin r
r = 21°
Angle of refraction is equal to 21°.
Now,
distance at which refractive angle comes out
d = 2.5 mm
α be the angle with horizontal surface and incident ray.
α = 90°-21° = 69°
t be the thickness of the film.
So,
t = 2.26 mm
Hence, the thickness of the film is equal to 2.26 mm.