Answer:
U = tantheta - KX/mgcostheta
Step-by-step explanation:
The formula for calculating the coefficient is given by.
KX = mgsintheta - mgucostheta
Making u subject of the formula we have
U = tantheta - KX/mgcostheta
K = 165N/m
X = 12 cm = 0.12m
U = tantheta - 165*0.12/mg*costheta
The question isn't complete but with this you can fix value for the mass and angle to get the final answer easily
Answer:
![11, 5](https://tex.z-dn.net/?f=11%2C%205)
Step-by-step explanation:
![x=y-6](https://tex.z-dn.net/?f=x%3Dy-6)
![xy=55](https://tex.z-dn.net/?f=xy%3D55)
Put x as y-6 in the second equation.
![(y-6)y=55](https://tex.z-dn.net/?f=%28y-6%29y%3D55)
![y^2-6y=55](https://tex.z-dn.net/?f=y%5E2-6y%3D55)
![y^2-6y-55=0](https://tex.z-dn.net/?f=y%5E2-6y-55%3D0)
Factor.
![\left(y+5\right)\left(y-11\right)=0](https://tex.z-dn.net/?f=%5Cleft%28y%2B5%5Cright%29%5Cleft%28y-11%5Cright%29%3D0)
![\left(y+5\right)=0](https://tex.z-dn.net/?f=%5Cleft%28y%2B5%5Cright%29%3D0)
![y=-5](https://tex.z-dn.net/?f=y%3D-5)
It has to be a positive integer.
![y-11=0](https://tex.z-dn.net/?f=y-11%3D0)
![y=11](https://tex.z-dn.net/?f=y%3D11)
Substitute y as 11.
![x=y-6](https://tex.z-dn.net/?f=x%3Dy-6)
![x=11-6](https://tex.z-dn.net/?f=x%3D11-6)
![x=5](https://tex.z-dn.net/?f=x%3D5)
4 hours? i may be wrong
i did - 60 * 15
seems about right, since 50% would be 7.5 hours?
Its 43. All triangles add to 180 so 47 + 90 = 137. then subtract 180 - 137 and get 43