Answer:
By velocity, they mean speed. The formula for speed is Frequency * wavelength= Speed. So your answer is l225.
The atomic number is how much space is in a object and the mass number is how much it's filled... if I'm not mistaken...
Explanation:
Significant figures of a number written in positional notation are digits that carry meaningful contributions to the measurement resolution of the number.
The emf induced = B*l*v where B is the flux density, l the length of the conductor and v the velocity of the conductor. In the given case B = 0.035 N/amp.meter, l = 0.86 and v = 6 m/sec
emf = 0.035*0.86*6 = 0.1806 v ≈ 0.18 v
choice: D
Answer:
The total distance at 7 s is:
![x_{tot}=27\: m](https://tex.z-dn.net/?f=x_%7Btot%7D%3D27%5C%3A%20m)
Explanation:
<u>Distance due to the force</u>
We can use second Newton's law to find the acceleration.
![F=ma](https://tex.z-dn.net/?f=F%3Dma)
![a=\frac{F}{m}=\frac{9}{5}=1.8\: m/s^{2}](https://tex.z-dn.net/?f=a%3D%5Cfrac%7BF%7D%7Bm%7D%3D%5Cfrac%7B9%7D%7B5%7D%3D1.8%5C%3A%20m%2Fs%5E%7B2%7D)
Now, using the kinematic equation we will find the distance during this interval of time. Let's recall that the initial velocity is zero.
![x_{1}=0.5at_{1}^{2}](https://tex.z-dn.net/?f=x_%7B1%7D%3D0.5at_%7B1%7D%5E%7B2%7D)
![x_{1}=0.5(1.8)(3)^{2}](https://tex.z-dn.net/?f=x_%7B1%7D%3D0.5%281.8%29%283%29%5E%7B2%7D)
![x_{1}=8.1\: m](https://tex.z-dn.net/?f=x_%7B1%7D%3D8.1%5C%3A%20m)
In the second part of the motion, the object moves at a constant velocity, as long as there is no friction between the object and the floor.
First, we need to find the final velocity of the first interval
![v=v_{i}+at_{1}=0+(1.8)3=5.4\: m/s](https://tex.z-dn.net/?f=v%3Dv_%7Bi%7D%2Bat_%7B1%7D%3D0%2B%281.8%293%3D5.4%5C%3A%20m%2Fs)
So the second distance will be:
![x_{2}=vt_{2}=5.4*4=21.6\: m](https://tex.z-dn.net/?f=x_%7B2%7D%3Dvt_%7B2%7D%3D5.4%2A4%3D21.6%5C%3A%20m)
Therefore, the total distance is:
![x_{tot}=x_{1}+x_{2}=5.4+21.6=27\: m](https://tex.z-dn.net/?f=x_%7Btot%7D%3Dx_%7B1%7D%2Bx_%7B2%7D%3D5.4%2B21.6%3D27%5C%3A%20m)
I hope it helps you!