The energy derived from digesting food is chemical energy . hope this helps :)
The focal point of a mirror is half of the radius of curvature. We can use the formula, 1/f = 1/v + 1/u where f is the focal length , v is the image distance and u is object distance The distance of the star is assumed to be incredibly far away and 1 divided by a really big number is approximately zero, thus; 1/f = 1/v = 1/75 = 1/v therefore; the image is formed 75 cm infront of the mirror
<u>Answer:</u>
After 3 hours Amanda catch up to Ben.
<u>Explanation:</u>
Speed of Ben = 4 mi/h
Speed of Amanda = 6 mi/h
Time after Amanda starts after Ben leaves = 1.5 hours.
Let the time taken for them to catch up be t hours.
Distance traveled by Ben in time (t+1.5) = 4*(t+1.5)
Distance traveled by Amanda in time t = 6*t
Equating both the distances
4*(t+1.5)= 6*t
2t = 6
t = 3 hours
So after 3 hours Amanda catch up to Ben.