I think it's 0J because the man doesn't move the car.
W = F*d
W = 9000*0 (the car didn't move)
W = 0J
Answer:
0.3 N
Explanation:
i = 400 A
B = 30 x 10^-6 T
L = 25 m
Force due the current carrying conductor placed in a magnetic field
F = B i L SinФ
where, Ф be the angle between length vector and magnetic field vector
F = 30 x 10^-6 x 400 x 25 = 0.3 N
Answer:
![V_2=6.17\ m/s](https://tex.z-dn.net/?f=V_2%3D6.17%5C%20m%2Fs)
![Q=0.49\ m^3/s](https://tex.z-dn.net/?f=Q%3D0.49%5C%20m%5E3%2Fs)
Explanation:
Given that
![A_1=0.03m^2](https://tex.z-dn.net/?f=A_1%3D0.03m%5E2)
![A_2=0.08m^2](https://tex.z-dn.net/?f=A_2%3D0.08m%5E2)
We know that from continuity equation
![Q=A_1V_1=A_2V_2](https://tex.z-dn.net/?f=Q%3DA_1V_1%3DA_2V_2)
So
![A_1V_1=A_2V_2](https://tex.z-dn.net/?f=A_1V_1%3DA_2V_2)
![0.3V_1=0.08V_2](https://tex.z-dn.net/?f=0.3V_1%3D0.08V_2)
![V_1=2.66V_2](https://tex.z-dn.net/?f=V_1%3D2.66V_2)
Now from energy equation
![P_1+\dfrac{1}{2}\rho V_1^2=P_2+\dfrac{1}{2}\rho V_2^2](https://tex.z-dn.net/?f=P_1%2B%5Cdfrac%7B1%7D%7B2%7D%5Crho%20V_1%5E2%3DP_2%2B%5Cdfrac%7B1%7D%7B2%7D%5Crho%20V_2%5E2)
![P_2-P_1=\dfrac{1}{2}\rho V_1^2-\dfrac{1}{2}\rho V_2^2](https://tex.z-dn.net/?f=P_2-P_1%3D%5Cdfrac%7B1%7D%7B2%7D%5Crho%20V_1%5E2-%5Cdfrac%7B1%7D%7B2%7D%5Crho%20V_2%5E2)
![140=\dfrac{1}{2}\times 1.2\times 7.11\times V_2^2-\dfrac{1}{2}\times 1.2\times V_2^2](https://tex.z-dn.net/?f=140%3D%5Cdfrac%7B1%7D%7B2%7D%5Ctimes%201.2%5Ctimes%207.11%5Ctimes%20V_2%5E2-%5Cdfrac%7B1%7D%7B2%7D%5Ctimes%201.2%5Ctimes%20V_2%5E2)
![V_2=6.17\ m/s](https://tex.z-dn.net/?f=V_2%3D6.17%5C%20m%2Fs)
![Q=A_2V_2](https://tex.z-dn.net/?f=Q%3DA_2V_2)
Q=6.17 x 0.08
![Q=0.49\ m^3/s](https://tex.z-dn.net/?f=Q%3D0.49%5C%20m%5E3%2Fs)
Here ya go-!
Mass is both a property of a physical body and a measure of its resistance to acceleration (a change in its state of motion) when a net force is applied. An object's mass also determines the strength of its gravitational attraction to other bodies. The basic SI unit of mass is the kilogram (kg).
(um im sorry if its wrong-)