Answer:
The answer is A. on edgen. 
Explanation:
A. adding in the boxes an arrow that points from Qh to Qc
 
        
                    
             
        
        
        
Answer:

Explanation:
For answer this we will use the law of the conservation of the angular momentum.

so:

where  is the moment of inertia of the merry-go-round,
 is the moment of inertia of the merry-go-round,  is the initial angular velocity of the merry-go-round,
 is the initial angular velocity of the merry-go-round,  is the moment of inertia of the merry-go-round and the child together and
 is the moment of inertia of the merry-go-round and the child together and  is the final angular velocity.
 is the final angular velocity.
First, we will find the moment of inertia of the merry-go-round using:
I = 
I = 
I = 359.375 kg*m^2
Where  is the mass and R is the radio of the merry-go-round
 is the mass and R is the radio of the merry-go-round 
Second, we will change the initial angular velocity to rad/s as:
W = 0.520*2 rad/s
 rad/s
W = 3.2672 rad/s
Third, we will find the moment of inertia of both after the collision:

 

Finally we replace all the data:

Solving for  :
:

 
        
             
        
        
        
Answer:
The maximum mass that can fall on the mattress without exceeding the maximum compression distance is 16.6 kg
Explanation:
Hi there!
Due to conservation of energy, the potential energy (PE) of the mass at a height of 3.32 m will be transformed into elastic potential energy (EPE) when it falls on the mattress:
PE = EPE
m · g · h = 1/2 k · x²
Where:
m = mass.
g = acceleration due to gravity.
h = height.
k = spring constant.
x = compression distance
The maximum compression distance is 0.1289 m, then, the maximum elastic potential energy will be the following:
EPE =1/2 k · x²
EPE = 1/2 · 65144 N/m · (0.1289 m)² = 541.2 J
Then, using the equation of gravitational potential energy:
PE = m · g · h =  541.2 J
m =  541.2 J/ g · h
m = 541.2 kg · m²/s² / (9.8 m/s² · 3.32 m)
m = 16.6 kg
The maximum mass that can fall on the mattress without exceeding the maximum compression distance is 16.6 kg.
 
        
             
        
        
        
Answer:
measuring cup
The most popular tool used to measure capacity is the measuring cup.
 
        
                    
             
        
        
        
Conduction. Any material that easily allows heat to move through it. Vacuum. A region of space that contains no matter. Solid.