Answer:
Spring constant, K = 415.9 N/m
Explanation:
The period of vibration of a spring, T, is given by:
T = 2√m/K
Where m = mass of the body in kg, K = spring constant or force constant or elastic constant or stiffness in Nm-1
Making K the subject of the expression,
K = m(2)2/(T)2
K = 4m()2/(T)2
Where m = 0.38kg, = 3.14285714286, T = 0.19s
K = 4 x 0.38 (3.14285714286)2 / (0.19)2
K = 4 x 0.38 x 9.87755102043 / 0.0361
K = 15.0138775511 / 0.0361
K = 415.9 Nm-1
The statement that there are main five types of the stratification is false, because the stratification have mainly four types.
<h3>What is stratification?</h3>
Stratification means the enactment of screening or shortened the data, people, and objects into clear-cut groups or layers.
It is the technique that is used with the combination of another other data analysis tools. It means the categorization of the society on the basis of socioeconomic causes like wealth, income, race, education, etc.
There are mainly four stratification system that are slavery, estate systems, caste systems, and class systems.
Therefore, the given statement is false.
Learn more about the stratification, refer to:
brainly.com/question/5900661
Answer:
Federal system is a combination of two autonomous governments that involves general government with regional governments in a single political system.
Explanation:
Option 1. is the correct answer, a federal system refers to a system where constitutional authority is divided between a national government and state governments. It divide powers between a central national government and local state governments that are connected to one another by the national government.
Explained
Learned helplessness is a psychological disorder. It occurs when a person feel stressful situation repeatedly. In this situation they believe that they are not able to work and move. So that they do not try to escape or take action against the situation.
The opportunities become changed according to the situation. Martin Saligman explained about learned helplessness. Learned helplessness leads to the psychological disorder such as stress and depression. It is also included mental disorder such as PTSD.
Answer:option d: seventy-seven percent.
Explanation:
Poverty in the United States of America is measured by how many people that do not meet the Federal Government official poverty threshold. Poverty rate can be by ethnicity and by age.
The poverty rate for Black and African-Americans is twenty-three(23) percent making a total of about nine million and one hundred thousand people(9.1 million) in poverty which means that Seventy-seven(77) percent of African-American families are not living in poverty.
Few of the reasons why black and African-Americans face because of discrimination at their workplaces, education and so on.
