The sun is stable because the force of gravity is balanced by the thermal pressure created by the reactions in its core. the sun will remain stable a) as long as the outer surface of the sun remains solid b) as long as there is a sufficient source of energy within the sun. c) as long a the planets continue orbiting the sun d) as long as the gravity of jupiter does not act on the sun

Aclarinetist, setting out for a performance, grabs his 3.350 kg clarinet case (including the clarinet) from the top of the piano and carries it through the air with an upward force of 24.65 n. find the case's vertical acceleration. indicate an upward acceleration as positive and a downward one as negative.

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.

Which of these metals are magnetic?