3 years ago

Light waves from the sun can travel trough outer space and reach the earth

Physics

1 answer:

konstantin123 [22]3 years ago

7 0

Answer:

this is true

Explanation:

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Betty (mass 40 kg), standing on slippery ice, catches her leaping dog (mass 15 kg) moving horizontally at 3.0 m/s. Show that the

MA_775_DIABLO [31]

Answer:

v = 2.18m/s

Explanation:

In order to calculate the speed of Betty and her dog you take into account the law of momentum conservation. The total momentum before Betty catches her dog must be equal to the total momentum after.

Then you have:

$Mv_{1o}+mv_{2o}=(M+m)v$ (1)

M: mass Betty = 40kg

m: mass of the dog = 15kg

v1o: initial speed of Betty = 3.0m/s

v2o: initial speed of the dog = 0 m/s

v: speed of both Betty and her dog = ?

You solve the equation (1) for v:

$v=\frac{Mv_{1o}+mv_{2o}}{M+m}=\frac{(40kg)(3.0m/s)+(15kg)(0m/s)}{40kg+15kg}\\\\v=2.18m/s$

The speed fo both Betty and her dog is 2.18m/s

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3 years ago

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kenny6666 [7]

Answer:

Explanation:

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3 years ago

A ball is throw into the sky at 18m/s. How high can it reach?

Komok [63]

Answer:

The maximum height of the ball will be "16.53 m".

Explanation:

Given that,

$V_{final} = 18 \ m/s$

As we know,

The initial as well the final height on the ball will be same after it reaches it's maximum height.

then,

⇒ $V_{final}=V_{initial}$

where, $V_{initial} = \sqrt{2gh}$

$=\sqrt{2\times 9.8\times h}$

$=\sqrt{19.6h}$

hence,

The max height of the ball will be:

⇒ $18=\sqrt{19.6h}$

$19.6h=324$

$h=\frac{324}{19.6}$

$=16.53 \ m$

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3 years ago

What is the main difference between a gas and a plasma?

FrozenT [24]

Gases are not ionized while plasma is.

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4 years ago

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An object moving north with an initial velocity of 14m/s accelerates 5m/s squared. What is the final velocity of the object?

OLEGan [10]

The final velocity of the object is 16m\s.
Hope this helps! :)

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3 years ago