A horizontal disc rotates about an axis which passes vertically through the center of the disc with angular velocity of 100 r. p.m. A small particle of mass 10g is dropped onto the disc 9.0cm from the axis and sticks to the disc. If the angular velocity is reduced to 90 r. p.m. Determine the moment of inertia of the disc about the axis.

Select the word from the list that best fits the definition classification of most stars on the h-r diagram

What are similarities and differences between refraction, reflection, diffraction and absorption?

Amass m = 74 kg slides on a frictionless track that has a drop, followed by a loop-the-loop with radius r = 18.4 m and finally a flat straight section at the same height as the center of the loop (18.4 m off the ground). since the mass would not make it around the loop if released from the height of the top of the loop (do you know why? ) it must be released above the top of the loop-the-loop height. (assume the mass never leaves the smooth track at any point on its path.) 1. what is the minimum speed the block must have at the top of the loop to make it around the loop-the-loop without leaving the track? 2. what height above the ground must the mass begin to make it around the loop-the-loop? 3. if the mass has just enough speed to make it around the loop without leaving the track, what will its speed be at the bottom of the loop? 4. if the mass has just enough speed to make it around the loop without leaving the track, what is its speed at the final flat level (18.4 m off the ground)? 5. now a spring with spring constant k = 15600 n/m is used on the final flat surface to stop the mass. how far does the spring compress?