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3 years ago

During a medical evaluation, the doctor can __________.

2 answers:

3 0

During a medical evaluation, the doctor can D. all of the above. It is the doctor's duty to do all of these things - to establish some guidelines for activities, to see whether these programs are appropriate for the person in question, and to help them pick activities that will be safe for them and which they will be able to do without harming their bodies. These are all the things that doctors do in order to help their patients lead a safe and healthy life.

GarryVolchara [31]3 years ago

3 0

D Is Correct. ! Just Took The Test And Got It Right!

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At a maximum level of loudness, the power output of a 75-piece orchestra radiated as sound is 72.0 W. What is the intensity of t

FrozenT [24]

Answer:

The intensity would be 0.01432 W/ $m^{2}$

Explanation:

The sound intensity is the power that is transmitted by a sound wave per unit area.

Given that

Power output P of the 75-piece orchestra = 72.0 W

The listener's distance r = 20.0 m

The intensity of sound waves (I) can be obtained with the expression below;

I = P/A .............. 1

where P is the power

A is the area, in this case, at the distance r the sound is radiated through a sphere.

A = area of a sphere = 4π $r^{2}$

putting it into equation 1, the intensity would be;

I = P/ 4π $r^{2}$

Substituting our values we have;

I = 72.0 W / 4 π $20^{2}$ $m^{2}$

I = 0.01432 W/ $m^{2}$

Therefore the intensity would be 0.01432 W/ $m^{2}$

3 0

3 years ago

1. Calculate how many electrons you need to get a charge of 1 coulomb.

belka [17]

1) To make a charge of 1 Coulomb, $6.25\cdot 10^{18}$ electrons are needed

2) $3.75\cdot 10^{19}$ electrons are needed to make that current

3) The potential difference is the work done per unit charge by an electric field

4) False, false, true

Explanation:

The charge of one electron is equal to (in magnitude)

$q=1.6\cdot 10^{-19}C$

This is also known as fundamental charge, and it is also indicated with the letter $e$ .

The charge in this problem is

$Q=1 C$

Therefore, in order to calculate how many electrons are in 1 Coulombd of charge, we just divide the total charge by the charge of one electron:

$n=\frac{Q}{q}=\frac{1}{1.6\cdot 10^{-19}}=6.25\cdot 10^{18}$

The current intensity is defined as

$I=\frac{Q}{t}$

where

Q is the charge passing through a given point of a circuit in a time interval t

In this problem, we have

t = 60 s

I = 100 mA = 0.1 A

Therefore, the charge passing through the circuit is

$Q=It=(0.1)(60)=6 C$

We know that the charge of one electron is

$q=1.6\cdot 10^{-19}C$

So the number of electrons is

$n=\frac{Q}{q}=\frac{6}{1.6\cdot 10^{-19}}=3.75\cdot 10^{19}$

The electrical voltage (also called potential difference) can be understood by using the concept of energy and work.

In fact, the work done by an electric field on a charge of magnitude q is

$W=q\Delta V$ (1)

where $\Delta V$ is the potential difference between the initial and final point of motion of the charge. The potential difference is responsible for "pushing" the charge through the circuit (in particular, a positive charge is pushed towards a point of lower potential, while a negative charge is pushed towards a point of higher potential), and when this happens, the electric potential energy of the charge (due to its position in the electric field) is converted into kinetic energy (energy of motion).

So, the potential difference is basically the work done per unit charge by an electric field responsible for the acceleration of a charge, as we can rewrite eq.(1) as

$\Delta V = \frac{W}{q}$

So in this case (where the electric voltage is 5 volts), it means that the work done by this electric field per unit charge is 5 J per Coulomb of charge.

False: Current is the consequence and voltage is the cause. In fact, the voltage (the potential difference between two points in the circuit) is responsible for "pushing" the charges through the circuit, and when the charges start moving, they produce a current.

False: only the battery is a source of voltage. A battery is a device that produces an electromotive force (another name for potential difference), which is responsible for "pushing" the charges through the circuit. A socket, instead, is just a device used to connect another electric device to a voltage supply.

True: an electric current can only flow in a closed circuit. When the circuit is open, in fact, there is a point in the circuit where the flow of charge is interrupted: this means that the current can no longer flow in the circuit, so there is no electric current in an open circuit.

Learn more about current and potential difference:

brainly.com/question/4438943

brainly.com/question/10597501

brainly.com/question/12246020

#LearnwithBrainly

4 0

4 years ago

A bicycle rider travels 50.0 km in 2.5 hours. What is his average speed?

ycow [4]

50km / 2.5 = 20 km per hour

4 0

4 years ago

A uniform solid disk of radius 1.60 m and mass 2.30 kg rolls without slipping to the bottom of an inclined plane. If the angular

bagirrra123 [75]

To solve this problem we will use the concepts related to energy conservation. Both potential energy, such as rotational and linear kinetic energy, must be conserved, and the gain in kinetic energy must be proportional to the loss in potential energy and vice versa. This is mathematically

$PE = KE_{lineal} + KE_{rotational}$