Two disks are rotating about the same axis. disk a has a moment of inertia of 2.56 kg m2 and an angular velocity of +1.46 rad/s. disk b is rotating with an angular velocity of -7.31 rad/s. the two disks are then linked together without the aid of any external torques, so that they rotate as a single unit with an angular velocity of -4.73 rad/s. the axis of rotation for this unit is the same as that for the separate disks. what is the moment of inertia of disk b? number units the tolerance is +/-2%

There is a theory that indicates that dinosaurs became extinct when about 65 million years ago, a large asteroid hit the earth surface. dust caused by this collision blocked the sunlight reaching the earth's surface and many forms of life became extinct due to the cold. fearing this threat, how large the radius of an asteroid should you be looking for if the dangerous asteroid size is approximately the same as the one that killed the dinosaurs? available data suggests that about 18% of that asteroid's mass ended up as a dust spread evenly over earth after eventually settling out of the upper atmosphere. about 0.0180 g/cm^2 of dust, which is chemically different than the earth's rock, covered the earth's surface. typical asteroids have a density of about 1.9 g/cm^3. now that we know the size of the asteroid, how much energy was released during impact, assuming all of it was just the kinetic energy of the asteroid right before the impact?

What are chlorofluorocarbons and what impact do they have on the atmosphere?

Anybody wanna ? (picture included? )