Find the magnitude & direction of the vector jk given points j(-6,-4) & k(-10,-4).

a. 4 units; 180 degrees
b. 16 units; 180 degrees
c. 4 units; 0 degrees
d. 16 units; 0 degrees

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.

What structural formula represents 4 electrons shared between two atoms?

Which of the following is a characteristic shared by both electron and light microscopes? a. they both employ the use of objective lenses. b. both microscopes require an internal camera to visualize the specimen. c. both microscopes have a resolving power of 0.01 nm. d. they both utilize white light to magnify the specimen.