Answer:
Average speed = 3.63 m/s
Explanation:
The average speed during any time interval is equal to the total distance travelled divided by the total time. 
That is, 
Average speed = distance/ time 
Let d represent the distance between A and B. 
Let t1 be the time for which she has the higher speed of 5.15 m/s. Therefore, 
5.15 = d/t1. 
Make d the subject of formula 
d = 5.15t1
Let t2 represent the longer time for the return trip at 2.80 m/s . That is, 
2.80 = d/t2. 
Then the times are t1 = d/5.15 5 and 
t2 = d/2.80. 
The average speed vavg is given by the following equation. 
avg speed = Total distance/Total time 
Avg speed = d + d/t1 + t2
Where 
Total distance = 2d
Total time = t1 + t2
Total time = d/5.15 + d/2.80
Total time = (2.8d + 5.15d)/14.42
Total time = 7.95d/14.42
Total time = 0.55d
Substitute total distance and time into the formula above. 
Avg speed = 2d / 0.55d
Avg Speed = 3.63 m/s
 
        
             
        
        
        
Answer:
I'm pretty sure its B and C
Explanation:
B bc the weight is gravitational pull x mass so when the object has same mass the weight is smaller on moon
C bc mass is the same - you can't change it
 
        
                    
             
        
        
        
Answer:
The sun
Explanation:
In this system the energy of the sun heats the water in the pipe, producing a high pressured steam, which is used for moving a turbine and producing electricity, is a transformation of energy from solar to thermal, then to mechanical to electrical.
 
        
             
        
        
        
Answer:
1) p₀ = 0.219 kg m / s, p = 0, 2)  Δp = -0.219 kg m / s, 3) 100%
Explanation:
For the first part, which is speed just before the crash, we can use energy conservation
Initial. Highest point
             Em₀ = U = mg y
Final. Low point just before the crash
            Emf = K = ½ m v²
           Em₀ = Emf
           m g y = ½ m v²
            v = √ 2 g y
Let's calculate
            v = √ (2 9.8 0.05)
            v = 0.99 m / s
1) the moment before the crash is
            p₀ = m v
            p₀ = 0.221 0.99
            p₀ = 0.219 kg m / s
After the collision, the car's speed is zero, so its moment is zero.
            p = 0
2) change of momentum
            Δp = p - p₀
             Δp = 0- 0.219
             Δp = -0.219 kg m / s
3) the reason is
      Δp / p = 1
 In percentage form it is 100%
 
        
             
        
        
        
The is organic compound with the correct chemical formula C4H9O2. 
<h3>What is a model?</h3>
A model is a representation of reality. A model serves the purpose of prediction as well as explanation.
Looking at the model of the molecule we can see that it is the organic compound with the correct chemical formula C4H9O2. The molecule is shown in the image attached to this answer.
Missing parts:
There are several ways to model a compound. One type of model is shown.
What is the chemical formula for the molecule represented by the model?
CHO
C4H9O2
C4H8O
C3H8O2
Learn more about molecular models:brainly.com/question/156574?
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