What's the difference between the speed and velocity of an object?

A sheet of steel 1.4 mm thick has nitrogen atmospheres on both sides at 1200°C and is permitted to achieve a steady-state diffusion condition. The diffusion coefficient for nitrogen in steel at this temperature is 7.

A 2.9 kg lump of aluminum is heated to 92 C and then dropped into 11.0 kg of water at 5.2 C. Assuming that the lump-water system is thermally isolated, what is the system's equilibrium temperature?

A small barge is being used to transport trucks across a river. if the barge is 10.00 m long by 8.00 m wide and sinks an additional 3.65 cm into the river when a loaded truck pulls onto it, determine the weight of the truck and load.

Why are some consolation visible to New York State observers at midnight during April, but not visible at midnight during October

What substances were found in the innermost regions (within about the inner 0.3 au) of the solar system before planets began to form?

Show that the Newton has the units of mass times acceleration.

Light travels at 150000000km from the sun to earth in 8 minutes. What speed is this in Km/s

Electricity problem (coulomb's law)

An observer (O) spots a plane (P) taking off from a local airport and flying at a 29° angle horizontal to her line of sight and located directly above a tower (T). The observer also notices a bird (B) circling directly above her.

In order for convection to occur, you must have