Angle of Cannon Time to Hit the Ground (sec) Distance Traveled (m) Velocity (m/s) Kinetic Energy (kg m²/5²) 0 0 0.25 2.5 0.45 10 ° 0.38 3.1 20° 0.68 4.2 309 1.2 4 4 40 ° 1.5 5.8 50 ° 2 4.6 60 ° 2.2. 3 70 ° 3 2.2 80 3.1 1,5 90 3.5 0.5​

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.

If a simple machine reduces the strength of a force, what must be increased?

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?