Answer:
Option C. 16.6 m/s
Explanation:
To round this 16.558 m/s to 3sf, we need to count the number beginning from 1. When we get to the 3rd number( ie 5), we'll examine the fourth number(i.e 5)to see if it less than five or greater. If it less than five, then we'll discard it. But if it five or greater, we'll approximate it and add it to the 3rd number.
So.
16.558 m/s = 16.6m/s to 3sf
Answer:
While a body is said to be in motion if it changes its position with respect to immediate surroundings.
A body is said to be in uniform motion if it covers equal distances in equal interval of time.
A body is said to be in non-uniform motion if it covers unequal distances in equal interval of time or vice-versa
the water specific heat will remain at 4.184.
Answer:
Part a)
![F = 135.7 N](https://tex.z-dn.net/?f=F%20%3D%20135.7%20N)
Part b)
![F = 62.5 N](https://tex.z-dn.net/?f=F%20%3D%2062.5%20N)
Explanation:
Part a)
If block is sliding up then net force must be zero and friction will be in opposite to the direction of motion of the block
![Fcos\theta = mg + F_f](https://tex.z-dn.net/?f=Fcos%5Ctheta%20%3D%20mg%20%2B%20F_f)
![Fsin\theta = F_n](https://tex.z-dn.net/?f=Fsin%5Ctheta%20%3D%20F_n)
so we have
![Fcos\theta = mg + \mu(Fsin\theta)](https://tex.z-dn.net/?f=Fcos%5Ctheta%20%3D%20mg%20%2B%20%5Cmu%28Fsin%5Ctheta%29)
![F(cos\theta - \mu sin\theta) = mg](https://tex.z-dn.net/?f=F%28cos%5Ctheta%20-%20%5Cmu%20sin%5Ctheta%29%20%3D%20mg)
![F = \frac{mg}{cos\theta - \mu sin\theta}](https://tex.z-dn.net/?f=F%20%3D%20%5Cfrac%7Bmg%7D%7Bcos%5Ctheta%20-%20%5Cmu%20sin%5Ctheta%7D)
![F = \frac{55}{cos50 - 0.310(sin50)}](https://tex.z-dn.net/?f=F%20%3D%20%5Cfrac%7B55%7D%7Bcos50%20-%200.310%28sin50%29%7D)
![F = 135.7 N](https://tex.z-dn.net/?f=F%20%3D%20135.7%20N)
Part b)
If block is sliding down then net force must be zero and friction will be in opposite to the direction of motion of the block
![Fcos\theta = mg - F_f](https://tex.z-dn.net/?f=Fcos%5Ctheta%20%3D%20mg%20-%20F_f)
![Fsin\theta = F_n](https://tex.z-dn.net/?f=Fsin%5Ctheta%20%3D%20F_n)
so we have
![Fcos\theta = mg - \mu(Fsin\theta)](https://tex.z-dn.net/?f=Fcos%5Ctheta%20%3D%20mg%20-%20%5Cmu%28Fsin%5Ctheta%29)
![F(cos\theta + \mu sin\theta) = mg](https://tex.z-dn.net/?f=F%28cos%5Ctheta%20%2B%20%5Cmu%20sin%5Ctheta%29%20%3D%20mg)
![F = \frac{mg}{cos\theta + \mu sin\theta}](https://tex.z-dn.net/?f=F%20%3D%20%5Cfrac%7Bmg%7D%7Bcos%5Ctheta%20%2B%20%5Cmu%20sin%5Ctheta%7D)
![F = \frac{55}{cos50 + 0.310(sin50)}](https://tex.z-dn.net/?f=F%20%3D%20%5Cfrac%7B55%7D%7Bcos50%20%2B%200.310%28sin50%29%7D)
![F = 62.5 N](https://tex.z-dn.net/?f=F%20%3D%2062.5%20N)
when a glacier came through the Bronx approximately 240,000 years ago it blocked part of the original path of the Bronx river and subsequently reshaped and modified the path of the river over the past 200 years the rivers course has been altered dramatically by human impact and industry.
have a great day ☺