Answer:
h = 4.04 m
Explanation:
Given that,
Mass of a child, m = 25 kg
The speed of the child at the bottom of the swing is 8.9 m/s
We need to find the height in the air is the child is able to swing. Let the height is h. Using the conservation of energy such that,

Put all the values,

So, the child is able to go at a height of 4.04 m.
A, D is the correct answers
Answer:
Horizontal component = 241 N
Vertical component = 287 N
Explanation:
Given:
Force = F = 375 N
Referring to diagram attached, the force F is making an angle
theta = 20+30 = 50 with the horizontal.
Horizontal component = F*cos(theta) = 375*0.64278 = 241 N
Vertical component = F*sin(theta) = 375*0.76604 = 287 N
I think its 1,2 sorry if wrong
Answer:
The distance is 
Explanation:
From the question we are told that
The focal length is 
Generally the lens equation is mathematically represented as

At image distance u = 1.5 m

=> 
=>
At image distance 

=> 
=> 
The distance the lens need to move is evaluate as


