An object makes a displacement of 4m within 1 seconds. Find the velocity.

What is the length x of the side of the triangle below? (hint: use the cosine function)

How can you increase the strength of an electromagnet?

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.