George does 62 joules of work to lift a 2.0 kg box at a constant speed. If he drops it, how fast will the box be going when it hits the ground? 31 m/s

7.9 m/s

62 m/s

11 m/s

5.6 m/s

Jessie ran 5000 meters from the cops and an average speed of 6 meters / second before he got caught . how long did he run?

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.

Observations show that interstellar clouds can have almost any shape and