Why are the mitochondria in plant cells important?

An electron moves 4.5 m in the direction of an electric field of strength 325 N/C. What is the change in electrical potential en

Vinvika [58]

Calculate q* E * d
<span>Put q = 1.6 x 10^-19 </span>
<span>E = 325 </span>
<span>d = 4.5

I hope this helps!</span>

6 0

4 years ago

One of the most effective ways to evaluate data is to try to replicate it.

WINSTONCH [101]

It seems that you have missed the given options for the given statement above whether it is true or false. But anyway, the correct answer would be TRUE. It is true that one <span>of the most effective ways to evaluate data is to try to replicate it. Hope that this answer will help you. </span>

6 0

3 years ago

Read 2 more answers

A fidget spinner experiences a constant torque of 1.4 N.m. If the spinner is initially at rest, what is its angular momentum 2.0

motikmotik

Answer:

$2.8N-msec$

Explanation:

We have given torque $\tau =1.4N-m$

Initial time $t_1=0\ sec$

Final time $t_2=2\ sec$

There is relation between angular momentum and torque

that is $\frac{dL}{dt}=\tau$

$dL=\tau dt$

$\int dL=\tau \oint_{t_1}^{t_2}dt$

$L=\tau (t_1-t_2)=1.4\times (2-0)=2.8N-msec$

4 0

4 years ago

An alternator consists of a coil of area A with N turns that rotates in a uniform field B around a diameter perpendicular to the

matrenka [14]

Answer:

(a): $\rm 2\pi f\ NBA\ \sin(2\pi ft).$ .

(b): 20.94 Volts.

Explanation:

<u>Given:</u>

Area of the coil = A.
Number of turns of the coil = N.
Magnetic field in which the coil is placed = B.
The frequency with which the coil is rotating = f.

The magnetic flux linked with a coil is defined as

$\phi = N\vec B \cdot \vec A=\rm NBA\cos\theta$

where,

$\vec A$ is the area vector of the coil, directed along the normal to the plane of the coil.

$\theta$ = angle between the magnetic field and the area vector of the coil.

Assuming that the magnetic field is along the normal to the plane of the coil, initially.

Therefore, at any later time t, the angle which the magnetic field makes with the normal to the plane of the coil is is given by

$\rm \theta = 2\pi ft.$

Therefore, the magnetic flux linked with the coil at any time t is given by

$\rm \phi = NBA\cos(2\pi ft).$

According to the Faraday's law of electromagnetic induction, the emf induced in the coil is given by

$\rm e=-\dfrac{d\phi}{dt}\\=-\dfrac{d(NBA\cos(2\pi ft))}{dt}\\=-NBA\dfrac{d(\cos(2\pi ft))}{dt}\\=-NBA(-2\pi f\sin(2\pi ft))\\=2\pi f\ NBA\ \sin(2\pi ft).$

The amplitude of the alternating voltage is the maximum value of the induced emf in the coil, the induced emf in the coil is maximum when $\rm \sin(2\pi ft)=1$ .

Therefore, the amplitude of the alternating voltage is given by

$\rm e_o=(2\pi f)NBA\ 1\\=2\pi ft \ NBA.$

Given values are:

N = 100 turns.
A = $\rm 10^{-2}\ m^2$ .
B = 0.1 T.
f = 2000 rev/min = $\rm 2000\times \dfrac1{60}\ rev/s = 33.33\ rev/s.$

Putting all these values,

$\rm e_o=2\pi \times 33.33\times (100)\times (0.1)\times (10^{-2})=20.94\ Volts.$

7 0

3 years ago

In forced convection, the fluid is forced to move by external means such as a fan, pump, or the wind. You must provide an answer

ikadub [295]

Answer:

True

Explanation:

The heat trasnfer caused by the bulk movement of molecules of fluids is known as convection. Convection has two constituent process advection and diffusion. Examples of natural convection include atmospheric circulation, weather, oceanic circulation, mantle convection etc.

In forced convection the movement of fluid is caused by an external device (source). A fan, pump used to move fluid are external sources that cause fluid movement, the movement of fluid is not happening naturally.

6 0

4 years ago