Answer:
a) v=3.166 m/s
b) μ=0.0169
Explanation:
a)
The motion is totally inelastic collision so the mass of the person and the mass of the sled in the second part of the motion are add both.
![m_{p}*v_{p}+m_{s}*v_{s}=(m_{p}+m_{s})*v_{f}\\60kg*3.8\frac{m}{s}+12kg*0\frac{m}{s}=(60kg+12kg)*v_{f}](https://tex.z-dn.net/?f=m_%7Bp%7D%2Av_%7Bp%7D%2Bm_%7Bs%7D%2Av_%7Bs%7D%3D%28m_%7Bp%7D%2Bm_%7Bs%7D%29%2Av_%7Bf%7D%5C%5C60kg%2A3.8%5Cfrac%7Bm%7D%7Bs%7D%2B12kg%2A0%5Cfrac%7Bm%7D%7Bs%7D%3D%2860kg%2B12kg%29%2Av_%7Bf%7D)
![228 \frac{kg*m}{s}=72kg*v_{f}\\ v_{f}=\frac{228\frac{kg*m}{s}}{72kg}](https://tex.z-dn.net/?f=228%20%5Cfrac%7Bkg%2Am%7D%7Bs%7D%3D72kg%2Av_%7Bf%7D%5C%5C%20v_%7Bf%7D%3D%5Cfrac%7B228%5Cfrac%7Bkg%2Am%7D%7Bs%7D%7D%7B72kg%7D)
b)
The motion have friction so the force and coefficient can be find using Newtons second law where
![f_{k}=u*m*a*x](https://tex.z-dn.net/?f=f_%7Bk%7D%3Du%2Am%2Aa%2Ax)
![K=\frac{1}{2}*m*(v)^{2}\\](https://tex.z-dn.net/?f=K%3D%5Cfrac%7B1%7D%7B2%7D%2Am%2A%28v%29%5E%7B2%7D%5C%5C)
![-u*m*g*x=\frac{1}{2}*m*(v*cos(180))^{2}\\-u=-\frac{v^{2}}{2*g*x}\\u= \frac{3.16^{2}}{2*9.8*30}\\u=0.0169](https://tex.z-dn.net/?f=-u%2Am%2Ag%2Ax%3D%5Cfrac%7B1%7D%7B2%7D%2Am%2A%28v%2Acos%28180%29%29%5E%7B2%7D%5C%5C-u%3D-%5Cfrac%7Bv%5E%7B2%7D%7D%7B2%2Ag%2Ax%7D%5C%5Cu%3D%20%5Cfrac%7B3.16%5E%7B2%7D%7D%7B2%2A9.8%2A30%7D%5C%5Cu%3D0.0169)
1.Vitamin C (ascorbic acid)
Chemical formula of vitamin C is C6H8O6
Two elements found in vitamin C are Carbon and Hydrogen
2. Vitamin B12 (Cyanocobalamin)
Chemical formula of vitamin B12 is C63H88CoN14O14P
Two elements found in vitamin B12 are Phosphorous and Cobalt. Of these two elements, Cobalt is a trace element and is found right at the center of this vitamin.
3. Vitamin E (alpha-Tocopherol)
Chemical formula of vitamin E is C29H50O2
Two elements found in vitamin E are Hydrogen and Oxygen.
Answer:
Economic Development is the creation of wealth from which community benefits are realized. It is more than a jobs program, it's an investment in growing your economy and enhancing the prosperity and quality of life for all residents. Economic development means different things to different people.
Grass dear wolf is the right awnser
<span>Frequency of the pendulum F = 0.15Hz
Acceleration due to gravity g = 9.81 m/s^2
Period of the pendulum is calculated by T = 2 x 3.14 x squareroot of (L / g), L being the length of the pendulam.
We have an equation between T and F => T = 1 / F
T = 1 / 0.15 => T = 20 / 3
Now substituting the values
=> 20 / 3 = 2 x 3.14 x squareroot of (L / 9.81)
=> 3.33 = 3.14 x squareroot of (L / 9.81)
=> squareroot of (L / 9.81) = 3.33 / 3.14
=> L / 9.81 = 1.06^2
=> L = 1.13 x 9.81
Length of the pendulum = 11 m</span>