Answer:
C
Explanation:
Timelines organize events from earliest to most current/latest, so the earliest event relating to the topic would be first in the timeline.
Answer:
The threat to internal validity most likely to account for this change is <u>History</u>.
Explanation:
To understad the threats to internal validity during this research, the element that has to be considerate this case is history. The event in time that occure during the experiment, was the rising of the price of gasoline per gallon. Since the research had to do with determining attitudes toward the use of alternative energy, this event of the rising of the gasoline price, is a factor that may affect the validity of the investigation. Since this can defenetly modify the real position or previews position of the subjects towards the use of alternative energy. This specific aspect definetly changes the pretests done by the researcher.
I think climate change is real and human activity is definitely impacting and speeding up the process.
Answer:
A ferromagnetic material is a substance that can possess magnetization in the absence of an external magnetic field. ... The main difference between hard iron and soft iron is that hard iron cannot be demagnetized once it is magnetized whereas soft iron can be demagnetized once it is magnetized
Explanation:
Under normal conditions, a magnetic material like iron doesn't behave like a magnet because the domains don't have a preferred direction of alignment. On the other hand, the domains of a magnet. In soft iron, the domains return to being randomly aligned when the field is removed. Hard iron is used in permanent magnets. To make a permanent magnet, a piece of hard iron is placed in a magnetic field. An electromagnet, in contrast, uses soft iron; this allows the field to be turned on and off.
