To defeat decepticons, just kidding, it is a transformer<span> that increases voltage from primary to secondary.</span>
Answer:
The speed of the ambulance is 4.66 m/s.
Explanation:
Given that,
The siren emitting a whine at 1570 Hz
The cyclist pedaling a bike at 2.45 m/s
The cyclist hears a frequency of 1560 Hz
We know that,
Speed of sound wave
We calculate the speed of the ambulance
Using Doppler effect,
Where,
= frequency of ambulance siren
= cyclist hears the frequency
=speed of source
= speed of observer
Put the value in to the formula
Hence, The speed of the ambulance is 4.66 m/s.
Answer:
C. 5.6 × 10^11 N/C
Explanation:
The electric field at a distance from a charge is given by
where is the coulomb's constant.
Now, in our case
;
therefore,
which is choice C from the options given<em> (at least it resembles it).</em>