Quels branchement dois-tu faire pour mesurer la tension entre les bornes de la pile?
1 answer:
You might be interested in
Answer:
a) 919 m
b) 183.8 m
Explanation:
140 calories = 140 * 4186 J/calorie = 586040 J
a)When the hiker climbs a mountain, this energy is converted to potential energy, which has the following formula
where m = 65 kg is the mass, g = 9.81 m/s2 is the gravitational acceleration and h is the height that he climbs
b) If only 20% of food energy goes into mechanical energy, then the actual potential energy is
586040 * 0.2 = 117208
Similarly, the height that he could climbs is
To solve this we are going to use the formula for ideal mechanical advantage: 
where
is the machine mechanical advantage
is the input distance
is the output distance
We know for our problem that
and 
. Lets replace those values in our formula to find :
The ideal machine advantage of the machine is 3. The inventor is claiming that the actual mechanical advantage of the machine is 4. Since the actual mechanical advantage takes into account energy losses, it is always less than the ideal mechanical advantage. We can conclude that the developer's claim is false.
where
We know for our problem that
The ideal machine advantage of the machine is 3. The inventor is claiming that the actual mechanical advantage of the machine is 4. Since the actual mechanical advantage takes into account energy losses, it is always less than the ideal mechanical advantage. We can conclude that the developer's claim is false.