Students in Dr. Branch's physics class were calculating the average time required for one complete period of a pendulum bob. They set up five pendulums and timed the swing for each one twenty-five
times. Then they calculated the average period time.
One set of data varied significantly from the other sets. What could be one source of unavoidable
error that influenced the data?
Select one:
a. Not starting the timer at exactly the "go" call.
O b. Reading the stopwatch incorrectly.
O c. Stopwatch starts with one second on the clock.
O d. Students not paying attention to data collection

americans began to notice growing differences between the northern and southern sections of the country. there were more people living in cities in the north, which made it more urban. more people lived on farms in the south, which made it more rural. while many people were farmers in the northern states, there were now other ways to make a living, such as working in mechanical cotton gins factories manufacturing cloth, tools and other goods. people in the north supported high tariffs on goods imported from europe because the extra cost encouraged people to “buy american” instead. in the southern states, planters did not like tariffs because they sold most of their production to europe and bought their tools from there as well. southerners believed the protective tariff was something that only northern factory owners keep their profits high. so the southern politicians came up with an idea. they would opt out. they would simply ignore the protective tariff. it was ‘null and void’ in south carolina. the state would not collect the taxes on goods imported into south carolina, no matter what the president said they had to do. this decision led to the nullification crisis.

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explanation:

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image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.

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