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ivanzaharov [21]
2 years ago
7

Someone please help me will give BRAILIEST!!!!!

Physics
1 answer:
nataly862011 [7]2 years ago
3 0
It uses C. Kinetic Energy
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The spherical side mirror on a car is convex and has a radius of curvature of 25 cm. Another car is following, 20 m behind the m
svlad2 [7]

Answer:

(D) 0.99 cm

Explanation:

Given that the radius of curvature of the mirror is 25 cm.

And another car is following which is behind the mirror of 20 m.

u=20m=2000cm

Focal length is half of the radius of curvature and it is negative for convex lens.

Now the mirror formula.

1/v+1/u=1/f

So,

1/v+1/2000=-1/(25/2)\\1/v=-1/2000-1/12.5\\v=-12.422cm

Now

Magnification is,

m=-v/u

So,

m=12.422/2000=0.00621

So, Height of the image

mh=0.00621\times 1.6 m\\mh=0.0099m\\mh=0.99cm

Therefore, the image height is 0.99 cm.

4 0
3 years ago
Someone pls answer this with steps
Ivanshal [37]
No worry’s I am here to help
8 0
2 years ago
A planet moves fastest in its orbit around the sun when it is at which position?
Nesterboy [21]

Answer:

When it's closest to the sun.

Explanation:

The force of gravity acting on a planet is equal to its mass times its centripetal acceleration.

Fg = m v^2 / r

The force of gravity is defined by Newton's law of universal gravitation as:

Fg = mMG / r^2

Therefore:

mMG / r^2 = m v^2 / r

MG / r = v^2

v increases as r decreases.  So the planet is moving fastest when it's closest to the sun, also known as the <em>perihelion</em>.

6 0
3 years ago
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What is the formula for calculating the efficiency of a heat engine?
Anton [14]

Answer:

Efficiency = StartFraction T Subscript h Baseline minus T Subscript C Baseline over T Subscript h Baseline EndFraction times 100. Efficiency equals T Subscript c Baseline minus T Subscript h Baseline over T Subscript h Baseline all times 100.

7 0
3 years ago
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What does the ozone layer absorb?
diamong [38]

The ozone layer absorbs UV (ultraviolet) radiation. The answer is letter C. the ozone layer is able to oxidize the electros and photons in the UV rays so that the light that can pass through can be not harmful to humans.

5 0
3 years ago
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