Which of the following statements about the tundra is not true? a. the tundra has limited vegetation. b. there are two main categories of the tundra biome. c. temperatures in the tundra can get below -20° f. d. the tundra biome does not support animal life. select the best answer from the choices provided a b c d

Which type of wave can travel without a medium

In the first law of thermodynamics, triangle e=q-w, what does q stand for

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.