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slamgirl [31]
2 years ago
8

Hey guys <3

Physics
1 answer:
Rus_ich [418]2 years ago
5 0

Answer:

8/9 parts

Explanation:

mark me as brainliest

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How much work is done in accelerating a 2000 kg car from rest to a speed of 30 m/s?
Otrada [13]
The work done is the same as the amount of energy increase. The formula for kinetic energy is 122
1
2
m
v
2
.

The initial KE of the car is 12(1000)×202=200,000
1
2
(
1000
)
×
20
2
=
200
,
000
joules.

The final KE of the car is 12(1000)×302=450,000
1
2
(
1000
)
×
30
2
=
450
,
000
joules.

The difference between these is the amount of work done: 450,000−200,000=250,000
450
,
000
−
200
,
000
=
250
,
000
joules.
14.2K viewsView upvotes

20



3
8 0
2 years ago
A body starts from rest and travels 120cm in the 8th second.Find the<br> acceleration​
dlinn [17]

Answer:

Hey mate hope its help you....

4 0
2 years ago
Read 2 more answers
How does an atom change if all of its electons are removed
r-ruslan [8.4K]

Answer:

c

Explanation:

Have a nice day

6 0
3 years ago
Read 2 more answers
Laser light of wavelength lambda passes through a thin slit of width a and produces its first dark fringes at angles of +/- 30 d
alukav5142 [94]

Answer:

D)  θ₂= 36. 6º  

Explanation:

In this diffraction experiment it is described by the equation

               sin θ = m λ

The first dark strip occurs for m = 1 and since the angle is generally small we can approximate sine to the value of the angle

              θ₁ = λ/ a

This equation is valid for linear slits, in the case of a circular slit the problem must be solved in polar coordinates, so the equation changes slightly

             θ₂ = 1.22 λ / a

In the proposed exercise we start with a linear slit of width a, where tes1 = 30º and end with a circular slit of the same diameter

             θ₂ = 1.22 λ / a

 

Let's clear (Lam/a) of equalizing the two equations

             θ₁ = θ₂/ 1.22

             θ₂ = 1.22 θ₁

             θ₂ = 1.22 30

             θ₂= 36. 6º

When reviewing the correct results is D

5 0
3 years ago
Suppose a logs mass was 5kg. After burning, the mass of the ash is 1 kg. Explain what may have happened to the other 4kg?
Helen [10]
Well, we know that mass is conserved, so the missing 4 kg couldn't
just disappear.  It had to go somewhere.

It may have left the burning log in the form of hot gases and smoke particles.
4 0
3 years ago
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