If the value of the resistor r2 were doubled, how would the value of the resistor r3 have to change in order to keep the current
1 answer:
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Answer:
When they are approaching each other
When they are passing each other
When they are retreating from each other
Explanation:
From the question we are told that
The velocity of car one is
The velocity of car two is
The frequency of sound from car one is
Generally the speed of sound at normal temperature is
Now as the cars move relative to each other doppler effect is created and this can be represented mathematically as
Where is the velocity of the source of sound
is the velocity of the observer of the sound
is the actual frequence
is the apparent frequency
Considering the case when they are approaching each other
Substituting value
Considering the case when they are passing each other
At that instant
Substituting value
Considering the case when they are retreating from each other
Substituting value
Answer:
If the canoe heads upstream the speed is zero. And directly across the river is 8.48 [km/h] towards southeast
Explanation:
When the canoe moves upstream, it is moving in the opposite direction of the normal river current. Since the velocities are vector (magnitude and direction) we can sum each vector:
Vr = velocity of the river = 6[km/h}
Vc = velocity of the canoe = -6 [km/h]
We take the direction of the river as positive, therefore other velocity in the opposite direction will be negative.
Vt = Vr + Vc = 6 - 6 = 0 [km/h]
For the second question, we need to make a sketch of the canoe and we are watching this movement at a high elevation. So let's say that the canoe is located in point 0 where it is located one of the river's borders.
So we are having one movement to the right (x-direction). And the movement of the river to the south ( - y-direction).
Since the velocities are vector we can sum each vector, so using the Pythagoras theorem we have:
