A diver jumps off a dving board and does a twisting manuever. In the midst of his jump in the air, the diver cannot change his
a. Rotational Energy
b. Rotational Speed
c. Rotational Inertia
d. Angular momentum
I say d just want to make sure
Correct.
To see if you really understand this, explain why answer a) is incorrect despite the fact that energy is conserved.
To determine the correct answer, let's analyze the options one by one:
a. Rotational Energy: Rotational energy refers to the energy associated with an object's rotation. In the context of the diver jumping off the diving board, the diver can change the configuration of their body mid-air, hence altering the distribution of rotational energy. So, the answer is not a.
b. Rotational Speed: Rotational speed refers to the rate at which an object rotates. In this case, the diver can change their body position in the air, which impacts the rotational speed. Therefore, the answer is not b.
c. Rotational Inertia: Rotational inertia, also known as the moment of inertia, is a property of an object that determines its resistance to change in rotation. When the diver changes their body position in the air, their rotational inertia changes accordingly. Therefore, the answer is not c.
d. Angular momentum: Angular momentum is a conserved quantity in the absence of external torques. When the diver is in the air, they can't exert any additional torques on their body, which means that their angular momentum remains constant. So, the correct answer is d.