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3 years ago

How batteries work? What are some possible mterials you could use to make your battery?

1 answer:

7 0

<span>Store chemical energy and then let it go as electrical energy when they are connected to a circuit.You can make batteries out of many things,like potatoes</span>

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A loop of wire is in a magnetic field such that its axis is parallel with the field direction. Which of the following would resu

iren2701 [21]

Answer:

All the 4 options

Explanation:

Electromagnetic induction occurs when the magnetic flux through a coil of wire is changing over time:

$\epsilon = -\frac{\Delta \Phi}{\Delta t}$

where

$\epsilon$ is the emf induced in the coil

$\Delta \Phi$ is the variation of magnetic flux

$\Delta t$ is the variation of time

The presence of an emf in the coil will generated an induced current.

The magnetic flux through the coil is given by

$\Phi = BA cos \theta$

where

B is the intensity of the magnetic field

A is the area of the coil

$\theta$ is the angle between the direction of the field and the axis of the coil

We see that any actions that changes one of these 3 variables will change the magnetic flux through the coil, so it will also induce a current.

The 4 options are:

1.Moving the loop outside of the magnetic field region. --> this will decrease the intensity of the magnetic field, B, therefore it will change the flux, and it will induce a current

2.Spin the loop such that its axis does not consistently line up with the magnetic field direction. --> this will change the angle between the direction of the coil's axis and the field B, so this will also change the flux, and therefore will induce a current

3.Change the magnitude of the magnetic field. --> this will change the magnitude of B, so this will also change the flux, and therefore will induce a current

4.Change the diameter of the loop --> this will change the area of the coil A, so this will also change the flux, and therefore will induce a current

Therefore, all 4 options are correct.

6 0

3 years ago

A cube of oak wood with very smooth faces normally floats in water. Suppose you submerge it completely and press one face flat a

Rom4ik [11]

Answer:

There is no Buoyant force.

The block will only float to the surface when the pressed face is released

Explanation:

There would be no Buoyancy force on the cube of Oak wood when one face is pressed flat against the Bottom of a tank and this is simply because there is no upward force acting on the side of the cube that is pressed against the bottom

Buoyant force is simply caused by the pressure difference between the water over and under an object immersed in water . hence since there is no water pressure under the immersed cube there will be no pressure difference between the water under and over the cube of oak wood immersed in the water.

3 0

3 years ago

Find a numerical value for rhoearth, the average density of the earth in kilograms per cubic meter. Use 6378km for the radius of

mylen [45]

Answer:

density = 5520 kg/m^3

Explanation:

given that

radius of earth = 6378 km

G = 6.67 x 10⁻¹¹ m³/kg.s²

g = 9.80 m/s²

we know,