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
Hello Again! I think the Answer might be 220 m! ( 1/2) ( 21 m/s + 0 m/s) (21 s) = 220 m
Explanation:
When your head is submerged your skull also vibrates with the sound because it is close to the same density and elasticity as water. Below the surface sound wave pass directly through water and into your head. And above the surface the sound waves only vibrates your ear drum unless the sound is very loud.
Hello There!
Because kinetic energy is proportional to the square of the velocity, when velocity is doubled, kinetic energy is quadrupled.
