Question
they are twp problem
The particles in the figure below are connected by a very light rod. They rotate about the>- axis at 2.0 rad's. Find the speed of each particle, and use it to calculate the kinetic energy of this system directly from. Find the moment of inertia about the j axis, calculate the kinetic energy from K = 1/2 Iomega2, and compare your result with your Part-(a) result. Focus the Problem Describe the physics Plan the Solution Execute & Evaluate The KC-135 Stratotanker, also known as the Vomit Comet, is used by NASA to produce a zero gravity environment for brief periods of time. It takes the aircraft 25 s to travel from point A to point B along its flight trajectory. Consider a passenger sitting in one of the airplane's seats. If the passenger feels "weightless" at the top of the trajectory, what is the radius, R, of the trajectory assuming uniform circular motion? Your solution must include the following steps: Focus the Problem Describe the physics Plan the Solution Execute & Evaluate
Explanation / Answer
a) for 30 kg speed v1 = r w= 0.2*2=0.4m/s........... for 10 kg speed v2= 0.4*2=0.8m/s...............
KE= 0.5((30*.4^2+30*.4^2+10*0.8^2+10*0.8^2)=11.2 J...............
b) MOI I = 2K/w^2=2*11.2/.2^2=560 Kg m^2......................
2) speed = 0.5*3.14*R/t
R= v^2/g
