4 years ago

What makes light shine?

Physics

2 answers:

irga5000 [103]4 years ago

3 0

Answer:

a switch that flicks the light on

Rainbow [258]4 years ago

3 0

If you're talking about stars then it's because of hydrogen that is being converted into helium which gives off energy to heat the star making it extremely hot which makes it shine

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A 40kg mass is pulled by a horizontal force of 200N, with a constant velocity. What is h^2?

Sladkaya [172]

Answer:

40,000

Explanation:

200x 200=40000

I'm pretty sure that's the answer

6 0

3 years ago

A sports car traveling along a straight line increases its speed from 19.8 mi/h to 59.9 mi/h.a. What is the ratio of the final t

Natasha2012 [34]

Answer

given,

initial speed of the car (v₁)= 19.8 mi/h

final speed of the car (v₂)= 59.9 mi/h

a) initial momentum = m v₁

P₁ = 19.8 m

final final momentum = m v₂

P₂ = 59.9 m

ratio = $\dfrac{P_2}{P_1}$

= $\dfrac{59.9 m}{19.8 m}$

ratio of momentum= $\dfrac{P_2}{P_1}=3.025$

b) initial kinetic energy= 1/2 m v₁²

K₁ = 196.02 m

final kinetic energy= 1/2 m v₂²

K₂ = 1794.005 m

ratio = $\dfrac{K_2}{K_1}$

= $\dfrac{1794.005 m}{196.02 m}$

ratio of Kinetic energy= $\dfrac{P_2}{P_1}=9.15$

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3 years ago

A person rolls a barrel up an inclined plane with a length of 6m and a height of 3m/ How much force is needed to roll up the bar

snow_lady [41]

Answer:

Length (l) = 6 m

height (h) = 3 m

Load(L) = 500 N

Effort (E) = ?

we know the principal that

E * l = L * h

6 E = 500 * 3

6E = 1500

E = 250

therefore 250 N work is done on the barrel.

8 0

4 years ago

A horizontal force of 100 N is used to pull a crate, which weighs 500 N, at constant velocity across a horizontal floor. What is

Ilya [14]

Answer:

0.2

Explanation:

Horizontal force=100N

Weight of crate=500 N

We have to find the coefficient of kinetic friction.

Normal ,N=Weight=500N

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Where $F_x$ =Horizontal force

N=Normal force

$\mu_k$ =Coefficient of kinetic friction

Substitute the values in the formula

$100=\mu_k(500)$

$\mu_k=\frac{100}{500}=0.2$

Hence, the coefficient of kinetic friction =0.2

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3 years ago

What class lever is a stapler? Explain why.

zimovet [89]

Hi , a class 2 lever has the load between the force and the fulcrum .So a stapler is a good example.

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3 years ago

What makes light shine?​

What makes light shine?