Which two actions would weaken an electromagnet? A. Replacing a 6 V battery with a 9V battery
B. Replacing the hollow core of the magnet with a steel core
C. Increasing the number of wraps of wire
D. Replacing the steel core of the magnet with a plastic core
E. Decreasing the number of wraps of wire

If you visited mount shasta city (elevation 900 m [3000 ft.]) and found the outside air temperature to be 27°c (81°f), what would be the air temperature at the summit of mount shasta (elevation 4200 m [14,000 ft.]) at that moment-assuming that the temperature conditions with altitude change at an average, or normal, lapse rate?