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sdas [7]
4 years ago
12

A circular wire loop 51 cm in diameter has resistance 120 ω and lies in a horizontal plane. a uniform magnetic field points vert

ically downward, and in 25 ms it increases linearly from 5.0 mt to 55 mt. part a find the magnetic flux through the loop at the beginning.
Physics
1 answer:
Irina18 [472]4 years ago
3 0
The radius of the wire loop is r= \frac{51 cm}{2}= 25.5 cm=0.255 m, so the area enclosed by the loop is
A=\pi r^2 = \pi (0.255 m)^2=0.204 m^2

Initially, the magnetic field intensity is B=5.0 mT=0.005 T, so the magnetic flux throug the wire loop is
\Phi = BA=(0.005 T)(0.204 m^2)=1.02 \cdot 10^{-3} Wb

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The gas pressure inside a container decreases when
avanturin [10]

Answer:

When the volume increases or when the temperature decreases

Explanation:

The ideal gas equation states that:

pV= nRT

where

p is the gas pressure

V is the volume

n is the number of moles of gas

R is the gas constant

T is the gas temperature

Assuming that we have a fixed amount of gas, so n is constant, we can rewrite the equation as

\frac{pV}{T}=const.

which means the following:

- Pressure is inversely proportional to the volume: this means that the pressure decreases when the volume increases

- Pressure is directly proportional to the temperature: this means that the pressure decreases when the temperature decreases

8 0
4 years ago
The product of 2 x 104 cm and 4 x 10–12 cm, expressed in scientific notation is ____.
sdas [7]
Answer:    8 * 10⁻⁸  cm²  .
______________________________________________________
Explanation:
______________________________________________

(2 * 10⁴ cm) * (4 * 10⁻¹² cm)  =

2 *4 * 10⁴ * 10⁻¹² = 8 * 10⁽⁴⁺⁽⁻¹²⁾⁾ =  8 * 10⁻⁸  cm² .
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Note the follow property of exponents:
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xᵃ * xᵇ = x⁽ᵃ ⁺ ᵇ⁾  ;  as such:  " 10⁴ * 10⁻¹² = 10⁽⁴⁺⁽⁻¹²⁾⁾ = 10⁻⁸ " .
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6 0
3 years ago
How is the reaction quotient used to determine whether a system is at equilibrium?
Juli2301 [7.4K]

Answer:

The answer to the question above is explained below

Explanation:

The reaction quotient, Q, is a measure of the relative amounts of reactants and products during a chemical reaction as it can be used to determine in which direction a reaction will proceed at a given point in time. Equilibrium constant is the numerical value of reaction quotient at the end of the reaction, when equilibrium is reached.

If Q = K then the system is already at equilibrium. If Q < Keq, the reaction will move toward the products to reach equilibrium. If Q > Keq, the reaction will move toward the reactants in order to reach equilibrium. Therefore, by comparing Q and K, we can determine the direction of a reaction.

Where Q= reaction quotient and Keq= equilibrium constant for the reaction.

The larger the equilibrium constant, the further the equilibrium lies toward the products. Reaction quotient is a quantity that changes as a reaction system approaches equilibrium.  

We can determine the equilibrium constant  based on equilibrium concentrations. K is the constant of a certain reaction when it is in equilibrium. Equilibrium occurs when there is a constant ratio between the concentration of the reactants and the products.

4 0
4 years ago
A flywheel with a radius of 0.200m starts from rest and accelerates with a constant angular acceleration of 0.900rad/s2.
kobusy [5.1K]

Answer:

The magnitude of the radial acceleration is 0.754 rad/s²

Explanation:

Given;

radius of the flywheel, r = 0.2 m

initial angular velocity of the flywheel, \omega_i = 0

angular acceleration of the flywheel, a = 0.900 rad/s².

angular distance, θ = 120⁰

the angular distance in radian = \frac{120}{180} \pi = \frac{2 \pi}{3}  \ rad

Apply the following kinematic equation to determine the final angular velocity;

\omega _f^2 = \omega _i ^2 + 2\alpha \theta\\\\\omega _f^2 = 0 + 2(0.9)(\frac{2\pi}{3} )\\\\\omega _f^2 = 3.7699\\\\\omega _f = \sqrt{ 3.7699} \\\\ \omega _f = 1.942 \ rad/s

The magnitude of the radial acceleration is calculated as;

\alpha _r = \omega ^2r\\\\\alpha _r  = (1.942)^2 (0.2)\\\\\alpha _r  =0.754 \ rad/s^2

Therefore, the magnitude of the radial acceleration is 0.754 rad/s²

4 0
3 years ago
Do transistors amplfy a.c or d.c<br>​
Gnoma [55]

Explanation:

thet amplify DC, because of the voltage ( small current input signal)

5 0
3 years ago
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