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4 years ago

When the k. E of

Physics

2 answers:

Ierofanga [76]4 years ago

8 0

$\sqrt{2}$ Answer:

KE2 = 2 KE1

1/2 M V2^2 = 2 * (1/2 M V1^2)

V2^2 = 2 V1^2

V2 = $\sqrt{2}$ V1

Since momentum = M V the momentum increases by $\sqrt{2}$

kolezko [41]4 years ago

6 0

Answer:

i need my points back -_-

Explanation:

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What are hot clouds of gaseous elements and compounds that act as nurseries for stars

Aleks04 [339]

Interstellar gas clouds are common in many galaxy, like the Orion nebulae which many young stars are being born. A typical nebula is many light years in diameter and contains enough material mass to make several thousand stars the size of our sun. The majority of the gas in nebulae consist of molecules of hydrogen and helium-but most nebulae also contain atoms of other elements. All known element in our periodic table is also being made inside this crucible of this immense hot gas. The source of the organic molecules is still a mystery. Irregularities in the density of the gas causes a net gravitational force that pull the gas molecules close together.

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3 years ago

What is the mass of .5 newtons(N)?

ddd [48]

Since the mass is 5 grams the acceleration is: 4000 m/s^2

But if the mass is 5 Kilograms the acceleration is: 4 m/s^2

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3 years ago

A hot air balloon rises at a constant speed of 13 meters/second relative to the air. There is a wind blowing eastwards at a spee

Airida [17]

Answer:

13.02 m/s the velocity and 86.92 degrees the direction relative to ground

Explanation:

We need to add velocities in vector addition to find the resultant velocity " $v$ " of the balloon (the 13 m/s and the 0.7 m/s).

The velocities are at 90 degrees from each other (one pointing up and the other to the East). Notice from the attached image that the resultant velocity vector (picture in red) is actually the hypotenuse of a right angle triangle.

So we use Pythagoras to find the length (magnitude) of the resultant velocity vector:

$v = \sqrt{13^2 +0.7^2} = 13.018832...$

we can round the answer to 13.02 m/s

Now we need to find the angle that this new vector makes with the ground by using the definition of tangent of an angle that relates the two quantities that we just added:

$tan (\theta) = 13/0.7 \\ \theta = arctan (\frac{13}{07} = 86.91781918...$

So we round it to 86.92 degrees

5 0

3 years ago

A whistle produces sound of frequency of 1.00 kHz. If a listener moves with a speed of 30 m/s away from the whistle, what freque

Serggg [28]

Answer:

The frequency the listener hears is 911.765 Hz.

Explanation:

The speed of a sound is 340 m/s

The speed of listener is 30 m/s in a direction away from the whistle.

The speed of the listener with respect to the sound waves from the whistle

= ( 340 - 30) m/s

= 310 m/s

This because the direction of the sound waves from the whistle and the direction of travel of the listener are the same, that is, both are traveling away from the whistle.

Therefore from the formula we get

⇒ $\frac{f_2}{f_1} = \frac{v_2}{v_1}$ ⇒ $f_2$ = $1000 \times \frac{310}{340} = 911.765 \hspace{0.1cm} Hz$

The frequency the listener hears is 911.765 Hz.

8 0

3 years ago

Help me with both questions please?

Andrew [12]

Answer:

1. They all accelerate at the same rate.

2.The object travels at a constant velocity throughout the fall.

Explanation:

Earths gravitational pull is at a constant 9.08 m/s^2. so when objects are free falling, the objects in question can only fall so fast before it would break gravity so to speak.

3 0

3 years ago