If the speed of an object were to triple, what would be the increase of kinetic energy? KE2 = _____ KE1
1 answer:
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To solve the problem, we can use the equivalent of Newton's second law for rotational motions:
where
is the net torque acting on the object
I is the moment of inertia of the body
is the angular acceleration of the object.
Using the data of the problem:
and 
, we find the net torque acting on the object:
where
I is the moment of inertia of the body
Using the data of the problem:
Answer:
Walking burns up more energy,1740000J
Explanation:
Given that the displacement is 5.0km, and running at 10km/h and uses, walking at 3km/hr and uses 290watts:
Energy consumption for running is calculated as:
Energy consumption for walking is calculated as:
Walking is a slower process hence the need for more energy over longer periods raltive to running the same distance.
Hence walking burns more energy; 1,740,000J. It burns more because you walk for a greater period of time.