A favorite sport/play activity of children and even young adults throughout history, dating back to the Greeks and Romans (and, yes, even today) is "hoop trundling" or hoop rolling: rolling a wooden (generally for girls) or metal (most often for boys) hoop using a stick or hook. The games vary, such as seeing who can trundle (roll) the longest or farthest or even guiding them through an obstacle course. Let’s get a hoop and trundle!We have a thin iron hoop having a total mass of 2.50 kg. It has a diameter of 1.00 m.(a) What is the rotational inertia, I of the hoop?(b) If the hoop is rolling along at 1.00 rev/s, what is the rotational velocity, ω, of the hoop?(c) What is the angular momentum, L?(d) What is the translational (linear) kinetic energy, KET, of the hoop? (e) What is the rotational kinetic energy, KER, of the hoop?(f) What is the total kinetic energy, KETOT, of the hoop?

I’m good with pshycology

The figure is missing but we can answer anyway.the correct answer is "releasing the string". in fact, when the person is holding the bow and the arrow, the kinetic energy of the arrow is still zero (because the arrow is not moving). the moment the arrow is released, it acquires a velocity v, so its kinetic energy will become different from zero: where m is the mass of the arrow and v its velocity.  all the other options, instead, do not increase the kinetic energy of the system: -  pulling farther back on the string : this will just increase the elastic potential energy of the system-  holding the arrow higher: this will increase the gravitational potential energy of the system (which is given by u=mgh, where h is the height above the ground)-  decreasing the mass of the arrow: this will decrease the gravitational potential energy of the system (which is given by u=mgh, where m is the mass)

Blue light reflected from the ball enters human eyes.

Because there is no air in the jar, the vibrations can not travel through the air and create sound.  (that's why there is no sound in space, there is no air)