Alex pushes on a 2.0 kg book, resulting in a net force of 6.0 N on the book.
1 answer:
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Incomplete question.The complete question is attached below as screenshot along with figure
Answer:
Force is repulsive
Explanation:
Given data
Current I₁=5.00A
Current I₂=2.00A
Length L=1.20 m
Radius r=0.400m
To find
Force F
Solution
As the force is repulsive because currents are in opposite direction
From repulsive force we know that:
Substitute the given values
Answer:
Explanation:
We can use Doppler equation to find the frequency of the siren.
First of all we have the police car moving behind the car. Hence, the frequency detected by the car will be:
(1)
Now, when the police car is moving in front of the car, the frequency detected by the car will be:
(2)
By solving equation (1) and equation (2) for we have:
Knowing that:
- f(car1) = 1310 Hz
- f(car2) = 1240 Hz
- Vs = 343 m/s
- V(car) = 35 m/s
Finally, we just need to put this value into the first equation to find frequency of the police car.
I hope it helps you!