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boyakko [2]
3 years ago
5

Help me pleaseeeeee?!!!!!!!

Physics
1 answer:
Gnom [1K]3 years ago
4 0
There are 8 neutrons and 8 protons in the nucleus of an oxygen atom.
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Observations show that the dragonflies complete one revolution every 0.017 s during this "spin dry" maneuver. What is their angu
polet [3.4K]

Answer:

\omega=369.6\frac{rad}{s}

Explanation:

The time taken to complete one revolution is the period and is defined as:

T=\frac{1}{f}(1)

The angular speed is given by:

\omega=2\pi f\\f=\frac{\omega}{2\pi}(2)

Replacing (2) in (1) and solving for \omega:

T=\frac{1}{\frac{\omega}{2\pi}}\\\omega=\frac{2\pi}{T}\\\omega=\frac{2\pi}{0.017s}\\\omega=369.6\frac{rad}{s}

7 0
3 years ago
A 0.50-kg block slides across a tabletop with an initial velocity of 20 cm/s and comes to rest in a distance of 70 cm. Find the
mars1129 [50]

Answer:

FAE= 0.014 N

Explanation:

The KE of block is decreased because of the slowing action of the friction force .

Change in KE of block = work done on block by friction ƒ

⠀ ➪ ½mu²ƒ - ½mu²i = Fƒs cos θ

Because the friction force on the block is opposite in direction to the displacement , cos θ = -1

➢ Using Uƒ = 0 , Vƒ = 0.20 m/s , and s = 0.70 m

✒ We find ,

➪½mu²ƒ - ½mu²i = Fƒs cos θ

➪0-½ (0.50 kg) (0.20 m/s)² = (Fƒ) (0.70 m) (-1)

➪ Fƒ = 0.014 N

Hope this helped, can i pls have brainliest

6 0
3 years ago
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You blow across the open mouth of a test tube and produce the fundamental standing wave of the air column inside the test tube i
WITCHER [35]

Answer:

B: 980 Hz

Explanation:

8 0
3 years ago
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Water in the oceans may become fresh water available to humans through the processes of
Darya [45]
<span>Water in the oceans may become fresh water available to humans through the processes of evaporation, condensation and precipitation.

In these processes, water is heated to a very high temperature until it evaporates in order to kill the germs and remove the salts which remains after water evaporation. The next step in condensing the water vapor (which is now fresh) and precipitating this vapor to be used by humans.</span>
4 0
3 years ago
during convection, hot material _____ (expands &amp; sinks, cools &amp; rises, expands &amp; rises, deflates &amp; rises) then m
Lady bird [3.3K]

Answer:

During convection, hot material expands & rises then moves to the side and cools & sinks. this circular pattern is called a convection current.

Explanation:

Convection is one of the three methods of transfer of heat. It occurs only in fluids (liquids or gases).

Convection occurs when there is a source of heat that heats a fluid, such as in a boiling pot of water. The water which is on the bottom of the pot becomes warmer before than the water at the top (because it is closer to the flame), and so it becomes less dense: for this reason, it expands and it becomes rising. On the contrary, the water on top is colder, so it is more dense and starts sinking, replacing the warmer water. As the new part of water gets warmer, it starts rising, and so the process is continuously repeated. This circular current is called convection current.

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3 years ago
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