Answer:
Explanation:
Given
density of balloon
density of air
volume of balloon
If balloon is rising then
where
divide by
I think the corect answer would be C. When a police officer receives information that you are speeding in your vehicle, she is using the frequency of the wave to measure the Doppler Effect. As the speed of a vehicle increases, the greater the change of the frequency of the waves would be transmitted to the radar guns which is being used by the police officer. Doppler effect is an effect that is observed in sound and light waves as these waves move away or to the direction of the observer. This is being used in many applications like in astronomy, weather balloons, the radar guns,and for underwater researches.
Answer:
(C) , The wires repel
Explanation:
We are given that
Length of wire=L=7 m
We have to find the magnitude and direction of the force that the two segments of this cord exert on each other.
Where
Using the formula
When the wires carrying current in equal current in opposite direction then, the wire repel to each other.
Hence, the wires repel to each other.
This must be the scientific "Hypothesis"...