Which of the following is the best reason to rest muscle groups between workouts?
a. it allows the muscles to store more energy.
b. it allows you to focus on other muscle groups.
c. it allows the muscles time to heal.
d. it allows the muscles to properly overload

1.what is where an object is located 2. what is how fast an objects speed is changing 3. what is how fast an object is moving

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.

A( developed during the process of technology design