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3 years ago

What happens when light bounces off an object

2 answers:

7 0

When light bounces off an object, it either gets absorbed, or reflected. For example, light can get absorbed on surfaces which are black in color and they can reflect from flat surfaces such as a mirror. It all matters on the angle of incidence. The angle of incidence is also known as the angle of reflection.

Angle of reflection = Angle of incidence

The ray of light approaching the mirror is called the incident ray. The ray of light that leaves the mirror is called the reflected ray.

Hope it helps

Sever21 [200]3 years ago

3 0

Absorbtion consists of when light strikes on an object and bounces off.

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32. (FR) A mass moving at 25 m/s slides along a rough horizontal surface. The coefficient of friction is 0.30. (A) Use force and

scoray [572]

Answer:

A)s = 104.16 m

b)s= 104.16 m

Explanation:

Given that

u = 25 m/s

μ = 0.3

The friction force will act opposite to the direction of motion.

Fr= μ m g

Fr= - m a

a=acceleration

μ m g = - m a

a= - μ g

a= - 0.3 x 10 m/s² ( take g= 10 m/s²)

a= - 3 m/s²

The final speed of the mass is zero ,v= 0

We know that

v² = u² +2 a s

s=distance

0² = 25² - 2 x 3 x s

625 = 6 s

s = 104.16 m

By using energy conservation

Work done by all the forces =Change in the kinetic energy

$- Fr.s=\dfrac{1}{2}mv^2-\dfrac{1}{2}mu^2$

Negative sign because force act opposite to the displacement.

$- \mu\ m\ g \ s=\dfrac{1}{2}mv^2-\dfrac{1}{2}mu^2$

$-\mu\ g \ s=\dfrac{1}{2}v^2-\dfrac{1}{2}u^2$

$-0.3\times 10\times \ s=\dfrac{1}{2}\times 0^2-\dfrac{1}{2}\times 25^2$

- 3 x 2 x s = - 625

s= 104.16 m

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3 years ago

A race car makes three and half laps around a circular track in 4.5 min. What is the car’s angular speed?

slavikrds [6]

Answer:

the angular speed is around 45

Explanation:

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3 years ago

The efficiency of a screw is low because of _____.

AfilCa [17]

The correct answer that would best complete the given statement above would be the second option. A screw is an inclined plane wrapped around a cylinder. The efficiency of a screw is low because there is more input than output. In other words, it is because of friction. Hope this answer helps.

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3 years ago

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SSSSS [86.1K]

Answer:

D. Drawing a conclusion about something

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4 years ago