Answer:8.2N
Explanation:I did the quiz on k12 and that’s the answer i got :)
Answer:c>a>b
Explanation:
Given
All the engine extracts same amount of heat(Q) from High-temperature reservoir
For a) 400 and 500 K
![\eta _{engine}=1-\frac{T_L}{T_H}](https://tex.z-dn.net/?f=%5Ceta%20_%7Bengine%7D%3D1-%5Cfrac%7BT_L%7D%7BT_H%7D)
![\eta _{engine}=\frac{work\ supplied}{heat\ supplied}](https://tex.z-dn.net/?f=%5Ceta%20_%7Bengine%7D%3D%5Cfrac%7Bwork%5C%20supplied%7D%7Bheat%5C%20supplied%7D)
![1-\frac{400}{500}=\frac{W_a}{Q}](https://tex.z-dn.net/?f=1-%5Cfrac%7B400%7D%7B500%7D%3D%5Cfrac%7BW_a%7D%7BQ%7D)
![W_a=\frac{Q}{5}](https://tex.z-dn.net/?f=W_a%3D%5Cfrac%7BQ%7D%7B5%7D)
For b)500 K and 600K
![1-\frac{500}{600}=\frac{W_b}{Q}](https://tex.z-dn.net/?f=1-%5Cfrac%7B500%7D%7B600%7D%3D%5Cfrac%7BW_b%7D%7BQ%7D)
![W-b=\frac{Q}{6}](https://tex.z-dn.net/?f=W-b%3D%5Cfrac%7BQ%7D%7B6%7D)
For c) 400 K and 600 K
![1-\frac{400}{600}=\frac{W_c}{Q}](https://tex.z-dn.net/?f=1-%5Cfrac%7B400%7D%7B600%7D%3D%5Cfrac%7BW_c%7D%7BQ%7D)
![W_c=\frac{2Q}{3}](https://tex.z-dn.net/?f=W_c%3D%5Cfrac%7B2Q%7D%7B3%7D)
So c will give the highest amount of work
c>a>b
The answer is to orient themselves and find food.
Answer:
7.3km/hr
Explanation:
v=d/t=4.5km/0.62hrs=7.3km/hr