Testing the electrical resistance of different materials. it is the answer
Well, pi/3 in Radians is equal to 60 degrees, and if your South is negative y and West is negative x, your line segment will be 60 degrees down of left, if you will. Your question is a little confusing, but I'm assuming you're drawing a force diagram, so probably draw the line segment at that angle and label it with the force of gravity- 40 lbs Hope that helps.
Answer:
v = 3.65 m/s
Explanation:
It is given that,
Mass of the block, m = 5.44 kg
Horizontal force acting on the block, F = 7.4 N
We need to find the speed of the block after it has moved 4.9 meters. It can be calculated using the work energy theorem as:
![F.d=\dfrac{1}{2}mv^2](https://tex.z-dn.net/?f=F.d%3D%5Cdfrac%7B1%7D%7B2%7Dmv%5E2)
![v=\sqrt{\dfrac{2Fd}{m}}](https://tex.z-dn.net/?f=v%3D%5Csqrt%7B%5Cdfrac%7B2Fd%7D%7Bm%7D%7D)
![v=\sqrt{\dfrac{2\times 7.4\times 4.9}{5.44}}](https://tex.z-dn.net/?f=v%3D%5Csqrt%7B%5Cdfrac%7B2%5Ctimes%207.4%5Ctimes%204.9%7D%7B5.44%7D%7D)
v = 3.65 m/s
So, the speed of the block is 3.65 m/s. Hence, this is the required solution.
We use the formula,
.
Here, v is velocity and its value given 26 mi/h ( in m/s,
) and d is distance and its value is given 80 m.
Substituting these values in above formula we get,
![t = \frac{80 m}{11.62m/s } = 6.88 \ s](https://tex.z-dn.net/?f=t%20%3D%20%5Cfrac%7B80%20m%7D%7B11.62m%2Fs%20%7D%20%3D%206.88%20%5C%20s)
Thus, the time delay between green lights on successive blocks to keep the traffic moving continuously is 6.88 s