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4 years ago

Help please, I need it

Physics

1 answer:

love history [14]4 years ago

5 0

Answer:

1.97×10⁻²¹ J

Explanation:

Use ideal gas law to find temperature.

PV = nRT

(9 atm) (9 L) = (83.3 mol) (0.0821 L·atm/mol/K) T

T = 11.9 K

The average kinetic energy per atom is:

KE = 3/2 kT

KE = 3/2 (1.38×10⁻²³ J/K) (11.9 K)

KE = 2.46×10⁻²² J

For a mass of 5.34×10⁻²⁶ kg, the kinetic energy is:

KE = (5.34×10⁻²⁶ kg) (1 mol / 0.004 kg) (6.02×10²³ atom/mol) (2.46×10⁻²² J)

KE = 1.97×10⁻²¹ J

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Formed through longshore drift a. sea stack b. sandbar c. spit d. headland

ANTONII [103]

<h3>Answer;</h3>

Sand Spit or Spit

<h3>Explanation;</h3>

Long shore drift is the process that occurs when a sheet of water moves on and off the beach, in other words the swash and back swash, thus capturing and transporting sediment on the beach back out to the sea.
Sandbar is normally formed when the sandspit stretches across a bay and connects the two sides. Headland is a high piece of land that extends out onto the sea. Sea stacks on the other hand results from the collapsing of the roof of the arch.

7 0

4 years ago

Read 2 more answers

High speed stroboscopic photographs show that the head of a 244 g golf club is traveling at 57.6 m/s just before it strikes a 45

almond37 [142]

Answer:

The speed will be "1.06 m/s".

Explanation:

The given values are:

Momentum,

m1 = 244 g

m2 = 45.2 g

On applying momentum conservation ,

Let v2 become the final golf's speed.

From Momentum Conservation

⇒ $Total \ initial \ momentum = Total \ final \ momentum$

⇒ $m1\times u1 + m2\times u2 = m1\times v1 + m2\times v2$

On putting the estimated values, we get

⇒ $0.244\times 57.6+0=0.244\times 39.9+45.2\times v2$

⇒ $57.844+0=9.7356+45.2\times v2$

⇒ $48.1084=45.2\times v2$

⇒ $v2=\frac{48.1084}{45.2}$

⇒ $v2=1.06 \ m/s$

6 0

3 years ago

If a book has a a mass of 2 kg, how much does the book weigh?

Anestetic [448]

Answer:

A. 20 N

Explanation:

the weight of book is 2×10= 20N

7 0

3 years ago

A model rocket has a mass of 0.435kg. It is mounted vertically and launches directly up with a thrust force of 13.1N.

EleoNora [17]

Answer:

17.27N

Explanation:

Given

m = 0.435kg

F = 13.1N

Unknown:

Weight or W

Formula and solution

W = F = mg

W = (0.435kg)(9.8m/s^2)

W = 4.26N + 13.1N

Final answer

W = 17.27N

4 0

3 years ago

''The rays that seem to emanate from a virtual image do not in fact emanate from the image'' . Explain the statement

riadik2000 [5.3K]

Answer:

Suppose that you are looking at the reflex candle in one mirror.

The image in the mirror is called the "virtual image"

If the real candle is at a distance of, let's say, 5 meters from the mirror, then the virtual image in the mirror will be also 5 meters "inside" the mirror.

Now, the light that emanates from the candle in the reflex seems to come from the virtual image, 5 meters inside of the mirror, but this is obviously not the real case.

The rays come, originally, from the real candle, and then those rays are reflected in the surface of the mirror.

Then the rays of the virtual image actually come from the surface of the mirror and not from the virtual image itself

4 0

3 years ago