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2 years ago

Question 9 of 20

1 answer:

5 0

B, we can use a power drill for an example, the motars are used by electricity (electrical energy) and used to screw in wood (mechanical energy)

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Sally and Juan’s science teacher has directed the class to build a paper airplane. The challenge is to build an airplane that fl

devlian [24]

Evaluating a solution

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2 years ago

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A certain type of laser emits light that has a frequency of 4.2 × 1014 Hz. The light, however, occurs as a series of short pulse

bogdanovich [222]

Explanation:

It is given that,

Frequency of the laser light, $f=4.2\times 10^{14}\ Hz$

Time, $t=3.2\times 10^{-11}\ s$

(a) Let $\lambda$ is the wavelength of this light. It can be calculated as :

$\lambda=\dfrac{c}{f}$

$\lambda=\dfrac{3\times 10^8}{4.2\times 10^{14}}$

$\lambda=7.14\times 10^{-7}\ m$

$\lambda=714\ nm$

(b) Let n is the number of the wavelengths in one pulse. It can be calculated as :

$n=f\times t$

$n=4.2\times 10^{14}\times 3.2\times 10^{-11}$

n = 13440

Hence, this is the required solution.

8 0

2 years ago

A force of 20N changes the position of a body. If mass of the body is 2kg, find the acceleration produced in the body.2. A ball

shepuryov [24]

Explanation:

Hello there!!!

You just need to use simple formula for force and momentum, 

F= m.a

and momentum (p)= m.v

where m= mass

v= velocity.

a= acceleration .

And the solutions are in pictures. 

Hope it helps..

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2 years ago

30 points for all 5 answers please

Lynna [10]

Answer:

he is doing science

Explanation:

8 0

2 years ago

How is energy transformed to chemical energy?

morpeh [17]

it is transfred through the basics

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2 years ago