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igomit [66]
4 years ago
8

how many revolutions are completed by a top spinning with a constant angular velocity of 3pi radians during a 20 sec time interv

al
Physics
1 answer:
patriot [66]4 years ago
7 0

Answer:

  30

Explanation:

Assuming the velocity is 3π radians <em>per second</em>, the top will spin through an angle of ...

  (3π radians/s)(20 s) = 60π radians

Since each revolution is 2π radians, that is ...

  (60π radians)/(2π radians/revolution) = 30 revolutions

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Two charged particles are a distance of 1.72 m from each other. One of the particles has a charge of 8.08 nC, and the other has
Dmitry_Shevchenko [17]

The magnitude (in N) of the electric force that one particle exerts on the other is A. F=107.6nN.

F=[(9×10^9) ×(7.10×10^-9) ×(4.42×10^-9)] /(1.62^2)

F=(282.4×10^-9)/2.6244

F=107.6×10^-9N

F=107.6nN

Experiments with electric charges have shown that two charged objects exert electrical forces on each other. The magnitude of the force is linearly proportional to the net charge of each object and inversely proportional to the square of the distance between the objects.

Coulomb's law for calculating electrostatic forces. This force arises from the interaction between two charged objects (or point charges), the magnitude of which is calculated by F = kQ1Q2r2 F = k Q 1 Q 2 r2.

Learn more about the electric field  here: brainly.com/question/14372859

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8 0
2 years ago
Convection occurs when thermal energy is transferred by the movement of what
Soloha48 [4]

Explanation:

You may know that electricity flows through wires. Wires are good conductors of electricity. Heat too can be transferred, or conducted, through some types of materials. The term conduction refers to the transfer of energy. Conduction occurs when energy is passed between objects.

The transfer of thermal energy is called heat. Particles of matter are in constant motion. Sometimes they collide with other particles. When they do, they transfer some of their energy. The energy is transferred from particle to particle. It is sort of like a row of dominoes falling over. In this process, thermal energy moves through a substance. It can even move into other nearby substances conduction occurs between particles of the metal in the pot. It also occurs between particles of the pot and the water. Figure below shows additional examples of conduction. Did you ever cook over a campfire? The man in Figure below is cooking his lunch. He waits as his food absorbs energy. First, the energy from the fire needs to heat the water. Soon, all the water in the pot will be boiling hot. The man also feels warm. He feels the heat from the flames. He feels the warmth even though he is not touching the flames. Thermal energy is transferred from the fire to his hands.

7 0
3 years ago
A shuttle bus slows down with an average acceleration of -2.4 m/s2. How long does it
olganol [36]

Answer:

\boxed {\boxed {\sf 3.75 \ seconds }}

Explanation:

Average acceleration is found by dividing the change in acceleration by the time.

a=\frac{ v_f-v_i}{t}

The shuttle bus has an acceleration of -2.4 meters per square second. It slows from 9.0 meters per second to rest, or 0 meters per second. Therefore:

a= -2.4 \ m/s^2 \\v_f= 0 \ m/s \\v_i= 9 \ m/s

Substitute the values into the formula.

-2.4 \ m/s^2=\frac{0 \ m/s - 9 \ m/s}{t }

Solve the numerator.

-2.4 \ m/s^2 = \frac{-9 \ m/s}{t}

We want to solve for t, the time. We have to isolate the variable. Let's cross multiply.

\frac{-2.4 \ m/s^2}{1} = \frac{-9 \ m/s}{t}

-9 \ m/s *1= -2.4 \ m/s^2 *t

-9 \ m/s=-2.4 m/s^2*t

t is being multiplied by -2.4. The inverse of multiplication is division, so divide both sides by -2.4

\frac{-9 \ m/s }{-2.4 \ m/s^2} =\frac{ -2.4 \ m/s^2*t}{-2.4 \ m/s^2}

\frac{-9 \ m/s }{-2.4 \ m/s^2} =t

3.75 \ s=t

It takes <u>3.75 seconds.</u>

4 0
3 years ago
Sally is going shopping with her friend Susan at the mall, which is located 10 kilometers away from her house. She drives half-w
nasty-shy [4]

Total distance between Sally's house and mall = 10 kilometers

Distance covered during half way drive = \frac{10}{2} Kilometers

Now, she goes back to her home.

Distance covered going back home = \frac{10}{2} Kilometers

Now, she drives from home to mall.

Distance covered from Sally's home to mall = 10 kilometers

Hence, the total distance Sally traveled = 5 + 5 + 10

Total distance Sally traveled = 20 kilometers

Hence, the answer is 20 kilometers

5 0
3 years ago
Read 2 more answers
The density of lead is 11.3 g/cm 3. What mass of lead is required to make a 1 cm 3 fishing sinker?
Aliun [14]

Answer:

11.3 g

Explanation:

given,

density of the lead = 11.3 g/cm³

volume = 1 cm³

mass of the lead = ?

we know,

density=\dfrac{mass}{volume}

mass = volume x density

mass = 1 x 11.3

mass = 11.3 g

hence, the mass of the lead is equal to 11.3 g

5 0
3 years ago
Read 2 more answers
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