Adumbbell-shaped object is composed by two equal masses, m, connected by a rod of negligible mass and lengthr. if "i1" is the moment of inertia of this object withrespect to an axis passing through the center of the rod andperpendicular to it and "i2" is the moment of inertia withrespect to an axis passing through one of the masses is i1 greaterthan, equal to, less than, or noncomparable to i2?

When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.

Ain is , is 's of ? 0.62 0.79 1.27 1.50