Which is the most extreme system of social inequality?

Shrinking Loop. A circular loop of flexible iron wire has an initial circumference of 165 cmcm , but its circumference is decrea

stiv31 [10]

Answer:

(a) emf = 1.18 mV

(b) counter-clockwise sense

Explanation:

(a) The induced emf is given by the following formula:

$emf=-\frac{d\Phi_B}{dt}$ (1)

where:

ФB: magnetic flux = AB = (area of the loop)*(magnitude of the magnetic field)

A = πr^2

B = 0.800 T

You replace the expression for the magnetic flux in the equation (1):

$emf=-B\frac{\Delta A}{\Delta t}=-B\frac{A_2-A_1}{t_2-t_1}$

A1: initial area

A2: final area

t2-t1: time interval = 9.0s

Then you have to calculate the change in the area of the loop, by using the information about the circumference of the loop. First you calculate the radius of the loop for a circumference of 165 cm = 1.65m

$s=1.65m=2\pi r\\\\r=\frac{1.65m}{2\pi}=0.262m$

You calculate the initial area A1:

$A_1=\pi (0.262m)^2=0.215m^2$

After 9.0 second the circumference will be:

$s'=1.65m-0.14\frac{m}{s}(9.0s)=0.39m$

the new radius and the final area is:

$r=\frac{0.39m}{2\pi}=0.062m$

$A_2=\pi(0.062m)^2=0.012m^2$

Finally, you replace in the equation (1):

$emf=-(0.800T)\frac{0.012m^2-0.215m^2}{9.0s}=1.8*10^{-3}V=1.8mV$

The induced emf in the circular loop is 1.18mV

(b) The induced emf generates an electric current, which produces a magnetic field that is opposite to the direction of the constant magnetic field of 0.800T. Due to this magnetic field point into the loop. The current has to have a direction in a counter-clockwise sense.

3 0

3 years ago

Why are fossil fuel resources sometimes referred to as buried sunshine

yKpoI14uk [10]

From research I found that the <span>fossil fuel resources are sometimes referred to as "buried sunshine" because they make the earth warm. They are also found deep in the earth and the energy stored in them was obtained from the sun long ago, and that's because they also produce energy the same way the sun does.

Hope this is the answer you were looking for and that it helps. :)</span>

5 0

3 years ago

Read 2 more answers

Sound waves have two parts. The part of the wave where the particles of the medium are spread apart is called the _____. rarefac

Kruka [31]

Rarefaction is the decrease in pressure of a medium, in which the density of the particles is reduced (they are "spread apart.") Compression is consequently the opposite, the point of highest pressure. Pitch amplitude refers to the intensity of the wave (the difference in pressure between the points of compression and those of rarefaction.

3 0

3 years ago

Read 2 more answers

A force does work on an object if a component of the force is

IrinaK [193]

Answer:

A force does work on an object if a component of the force is parallel to the displacement of the object.

Explanation:

Work, a measurement of energy is said to be done when a force applied to an object results in the movement of that object to a certain distance and direction. Force is the act of push or pulls occurs on an object as a result of the interaction between that object with another one and displacement is the distance and direction covered by that object as a result of the force applied on it.

The work done (W) by a constant force (F) is equal to the product of the force in the direction of displacement of the object and the distance (d) moved by the object i.e., W = F * d.

The angle between the displacement and the force is θ, then the work done, W = Fd cos θ ........ (1)

Positive work - Force acts in the same direction with respect to the displacement of the object. Here, θ is zero, so cos θ i.e., cos 0 is 1. Therefore, from the equation (1), W = Fd (i.e., work done by the force is positive).

Negative work - Force acts in the opposite direction with respect to the displacement of the object. Here, θ is 180°, so cos θ i.e., cos 180° is -1. Therefore, from the equation (1), W = -Fd (i.e., work done by the force is negative).

If a force is applied to an object and it does not move, then the work done is zero i.e., W = F * 0 = 0. Also, if the force and displacement are at right angle to each other, then θ is 90°. Therefore, from the equation (1), W = 0 since cos 90° is zero.

7 0

3 years ago

How is the motion of an object affected when a force acts on it?

Arada [10]

Newton's first law of motion is sometimes called the law of inertia. When the forces acting on an object are balanced, the object is either at rest or moving with a constant velocity. Unbalanced forces can cause an object to accelerate or decelerate. Unbalanced forces can also cause an object to change direction.

Hope that helps!

3 0

3 years ago