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3 years ago

An object has a. Kinetic energy of 17j and a mass of 27 kg, how fast is the object moving?

Physics

1 answer:

kolezko [41]3 years ago

4 0

Answer:

1.1 m/s

Explanation:

W = (mv^2)/2

W = 17J

m= 27kg

v = $\sqrt{\frac{2W}{m} }$ = $\sqrt{\frac{2*17}{27} }$ ≈ 1.1 m/s

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KatRina [158]

Answer:

2 m/s²

Explanation:

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2 m/s²

Because it changes constantly it veloctity.

Remember the aceleration changes the velocity.

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3 years ago

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Eduardwww [97]

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3 years ago

A light ray incident from medium 1 to medium 2, where n1>n2. When the incident angle exceed the critical angle ac, the refrac

vovikov84 [41]

Explanation:

(a)

Critical angle is the angle at the angle of refraction is 90°. After the critical angle, no refraction takes place.

Using Snell's law as:

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Where,

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Thus,

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${sin\theta_{critical}}=\frac {n_2}{n_1}$

Where,

${\theta_{critical}}$ is the critical angle

(b)

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3 years ago

How is force useful as well as harmful. Comment with the statement.

vladimir1956 [14]

No, we can't say force is useful or harmful. All else being equal, force is either not harmful or useful depending on the body that is applying it and where it is applying it.

Given how it affects motion, force is a crucial idea. It is a relationship that, in the absence of an opposing force, modifies an object's motion. However, a push or a pull that any object feels is the simplest definition of force. Due to the fact that force is a vector quantity, it possesses both a magnitude and a direction.

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A body at rest can move with enough force.A body in motion may be slowed down or stopped by it.It has the power to quicken the pace of an object in motion.Along with its shape and size, it can also alter the direction of a moving body.

How force is harmful

Force has the power to alter an object's state of motion.
Moving objects can shift direction due to force.
Moving things' speeds can be increased by force.
Moving items can become slower due to force.
Force has the power to alter an object's shape.

Learn more about force here

brainly.com/question/14362949

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1 year ago

You have an incident ray from a medium with a n1=1, through a medium with a n2 =3.325. If the incident angle is equal to 0.478 r

sesenic [268]

Answer:

0.139 rad

Explanation:

We use Snell's law $n_1sin\theta_1=n_2sin\theta_2$ , where if $n_1$ is the refractive index of the medium containing the incident ray, $\theta_1$ would be the incident angle, and if $n_2$ is the refractive index of the medium containing the refracted ray, $\theta_2$ would be the refraction angle, which we want, so we do: