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3 years ago

The driving force for an electric current is called:

2 answers:

7 0

<span>The driving force for an electric current is called an 'electromotive force',
a 'potential difference', or a 'voltage'.</span>

Paha777 [63]3 years ago

5 0

<span>Electromotive force is the answer.<span>
</span></span>

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A police car is driving down the street with it's siren on. You are standing still on the sidewalk beside the street. If the fre

diamong [38]

Answer:

A) 1568.60 Hz

Explanation:

This change is frequency happens due to doppler effect

The Doppler effect is the change in frequency of a wave in relation to an observer who is moving relative to the wave source

$f_(observed)=\frac{(c+-V_r)}{(C+-V_s)} *f_(emmited)\\$

where

C = the propagation speed of waves in the medium;

Vr= is the speed of the receiver relative to the medium,(added to C, if the receiver is moving towards the source, subtracted if the receiver is moving away from the source;

Vs= the speed of the source relative to the medium, added to C, if the source is moving away from the receiver, subtracted if the source is moving towards the receiver.

A) Here the Source is moving towards the receiver(C-Vs)

and the receiver is standing still (Vr=0) therefore the observed frequency should get higher

$f_(observed)=\frac{C}{C-V_s} *f_(emmited)\\=\frac{343}{343-15}*1500\\ =1568.60 Hz$

6 0

3 years ago

A sports car accelerates at a constant rate from rest to a speed of 90 km/hr in 8 s. What is its acceleration?

AfilCa [17]

First convert 90km/hr to m/s.

Initiate velocity = 0m/s (car was at rest)

Final velocity is 25m/s (90km/hr converted)

25m/s - 0m/s / 8s = 3.125 m/s^s

Therefore the answer is option A (3.13m/s^2)

3 0

3 years ago

Juan roller skates with a constant speed of 20km/h. How long will he take to travel a distance of 70 kilometers?

VMariaS [17]

3 hours and 30 minutes.Tell Juan to get a life.

8 0

4 years ago

Why is it necessary for cells to be so small

madreJ [45]

Answer:

Cells are small because they need to keep a surface area to volume ratio that allows for adequate intake of nutrients while being able to excrete the cells waste.

Explanation:

That is why the cell needs to be small

8 0

3 years ago

An object is traveling at a constant velocity of 10m/s for 4 seconds. What is its acceleration?

saw5 [17]

Answer:

<h2>The answer is 2.5 m/s²</h2>

Explanation:

The acceleration of an object given it's velocity and time taken acting on it can be found by using the formula

$acceleration = \frac{velocity}{time} \\$

From the question

time = 4 s

velocity = 10 m/s

So we have

$acceleration = \frac{10}{4} = \frac{5}{2} \\$

We have the final answer as

Hope this helps you

5 0

4 years ago