I’m pretty sure the answer would be :
9.8m/s2
Explanation: gravity =9.8m/s2
Frequency can be defined as the ratio between the speed of the wave and its wavelength, that is
![f= \frac{v}{\lambda}](https://tex.z-dn.net/?f=f%3D%20%5Cfrac%7Bv%7D%7B%5Clambda%7D)
At the same time, the frequency is the inverse of the Period so
![T = \frac{1}{f}](https://tex.z-dn.net/?f=T%20%3D%20%5Cfrac%7B1%7D%7Bf%7D)
If we join the two expressions we will have to
![T = \frac{\lambda}{v}](https://tex.z-dn.net/?f=T%20%3D%20%5Cfrac%7B%5Clambda%7D%7Bv%7D)
Replacing we have that
![T = \frac{4.9*10^{-2}}{1522}](https://tex.z-dn.net/?f=T%20%3D%20%5Cfrac%7B4.9%2A10%5E%7B-2%7D%7D%7B1522%7D)
![T = 3.219*10^{-5} s](https://tex.z-dn.net/?f=T%20%3D%203.219%2A10%5E%7B-5%7D%20s)
Therefore the period of the wave is ![3.219*10^{-5} s](https://tex.z-dn.net/?f=%203.219%2A10%5E%7B-5%7D%20s)
Hi there!
To find the appropriate force needed to keep the block moving at a constant speed, we must use the dynamic friction force since the block would be in motion.
Recall:
![\large\boxed{F_D = \mu N}}](https://tex.z-dn.net/?f=%5Clarge%5Cboxed%7BF_D%20%3D%20%5Cmu%20N%7D%7D)
The normal force of an object on an inclined plane is equivalent to the vertical component of its weight vector. However, the horizontal force applied contains a vertical component that contributes to this normal force.
![\large\boxed{N = Mgcos\theta + Fsin\theta}}](https://tex.z-dn.net/?f=%5Clarge%5Cboxed%7BN%20%3D%20Mgcos%5Ctheta%20%2B%20Fsin%5Ctheta%7D%7D)
We can plug in the known values to solve for one part of the normal force:
N = (1)(9.8)(cos30) + F(.5) = 8.49 + .5F
Now, we can plug this into the equation for the dynamic friction force:
Fd= (0.2)(8.49 + .5F) = 1.697 N + .1F
For a block to move with constant speed, the summation of forces must be equivalent to 0 N.
If a HORIZONTAL force is applied to the block, its horizontal component must be EQUIVALENT to the friction force. (∑F = 0 N). Thus:
Fcosθ = 1.697 + .1F
Solve for F:
Fcos(30) - .1F = 1.697
F(cos(30) - .1) = 1.697
F = 2.216 N
I and II only it’s has multiple paths for the electricity to flow
Answer:
In my knowledge
Option B. Lava flowed from the moon
and I am pretty sure cause I have read about it and option B is the conclusion I came with lol :D