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3 years ago

3. A cart at rest at the top of a roller coaster has 1000 J of

Physics

2 answers:

vovikov84 [41]3 years ago

5 0

Answer:

600J

Explanation:

Assuming no energy is lost and perfect transfers.

On the top of the first hill, $E_{k}+E_{p}=1000$ - however there is no Kinetic Energy so - $E_k = 0$

On the second hill, the total amount of energy is still the same (1000) - this time we have a smaller amount of potential energy. We can rearrange to get $E_k=1000-400$

wariber [46]3 years ago

4 0

Answer:

Explanation:

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Light from the star Betelgeuse takes 640 years to reach Earth. How far away is Betelgeuse in units of light-years? Name any hist

Eduardwww [97]

Answer:

Betelgeuse is 640 light years away from earth.

Explanation:

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If the light from a star takes 640 years to reach us, then that star its 640ly away from us.

Betelgeuse has been labeled as a Variant Star, which means that its brightness can fluctuate over the course of years, this has made difficult for astronomers to measure the exact distance of the star. Right now the star is estimated to be around 613 and 881ly away from earth, although, for the sake of your second question, we will take 640 years as our estimated value.

In 1380 (640 years ago) the Battle of Kulikovo took place. A battle of remarkable importance to Russian history, in which the Russian army, led by Prince Dmitry of Moscow, defeated the Mongol army, defining a turning point in the Mongol dominance, and setting the bases for what Russia is today.

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3 years ago

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Which of the following is true about the speed of light?

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Answer:

it is a constant value that does not depend on the observer

Explanation:

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2 years ago

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When the surface of an object is ____ the plane of projection, the surface appears in its true size and shape on the plane of pr

trapecia [35]

"Parallel to" the plane of projection

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2 years ago

Someone plans to float a small, totally absorbing sphere 0.500 m above an isotropic point source of light,so that the upward rad

mote1985 [20]

Answer:

468449163762.0812 W

Explanation:

m = Mass = $\rhoV$

V = Volume = $\dfrac{4}{3}\pi r^3$

r = Distance of sphere from isotropic point source of light = 0.5 m

R = Radius of sphere = 2 mm

$\rho$ = Density = 19 g/cm³

c = Speed of light = $3\times 10^8\ m/s$

A = Area = $\pi R^2$

I = Intensity = $\dfrac{P}{4\pi r^2}$

g = Acceleration due to gravity = 9.81 m/s²

Force due to radiation is given by

$F=\dfrac{IA}{c}\\\Rightarrow F=\dfrac{\dfrac{P}{4\pi r^2}{\pi R^2}}{c}\\\Rightarrow F=\dfrac{PR^2}{4r^2c}$

According to the question

$F=mg\\\Rightarrow \dfrac{PR^2}{4r^2c}=\rho \dfrac{4}{3}\pi R^3g\\\Rightarrow P=\dfrac{16r^2\rho c\pi Rg}{3}\\\Rightarrow P=\dfrac{16\times 0.002\times 19000\times \pi\times 0.5^2\times 9.81\times 3\times 10^8}{3}\\\Rightarrow P=468449163762.0812\ W$

The power required of the light source is 468449163762.0812 W

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2 years ago

What average force is required to stop a 1200 kg car in 7.0 s if the car is traveling at 95 km/h ?

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Here's how it's solved
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3 years ago