A student marks his starting point on a grassy field. He then makes three moves: 20 m east, 40 m north, and 80 m west. Where is his final position relative to his starting point? a 60 m east and 40 m north b 40 m west and 60 m north c 60 m east and 40 m south d 60 m west and 40 m north e 40 m east and 60 m south

What type of nuclear decay causes the atomic number of an element to increase by 1?

Asolid round steel rod 6.25 mm in diameter and 375 mm long is rigidly bonded to the end of solid square brass rod 25 mm on a side and 300 mm long. the geometric axes of the bare are along the same line. an axial tensile force of 5.4 kn is applied at the extreme ends of the assembly. for steel e = 200 gpa and for brass e = 90 gpa. determine the total elongation for the assembly.

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.