Предмет: Физика, автор: leila847

5 задание пж пжпжпж

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Ответы

Автор ответа: Ermyl

0

Ответ на задания 1-5

1. Какие деформации испытывают:

а) натянутая струна гитары

Деформация растяжения

б) сверло

Деформация кручения

в) Зубья пилы

Деформация изгиба

2. Под действием какой силы выпрямляется согнутая линейка? Чему будет равна эта сила, когда линейка полностью распрямиться?

Согнутая линейка выпрямляется под действием силы упругости (Fупр).

Когда линейка распрямится, эта сила будет равна нулю

3. Вычислить деформацию пружины жёсткостью 500 мН, растягиваемую двумя противоположно направленными силами по 100 Н каждая.

На фото ниже я всё расписал

- Знаком " / " обозначена дробная черта (Пример: 1/2 - в числителе 1, в знаменателе 2)

4. Каков коэфициент жёсткости берцовой кости, если масса человека 80 кг, а кость сжимается на 0.3 мм?

1) dx = 0,3 миллиметра = 0,0003 метра

(2)) Найдем силу тяжести (Fтяж), действующую на человека:

2) F = m*g = 80*10 = 800 Н

(3)) Тогда коэффициент жесткости будет равен:

3) k = F/dx = 800/0,0003 = 800*10^4/3 = 8*10^6/3 = 2,7*10^6 Н/м

Ответ: k = 2,7*10^6 Н/м

〘 k измеряется в [Н/м] (Ньютон/метр) 〙

〘dx - величина, на которую сжимается тело (в данном случае берцовая кость) 〙

5. Определите силу упругости по графику

На графике Fупр = 10 Н

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1.приводить к разным результатам;

2. политические меры;

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poverty; relative poverty an absolute poverty line; primary poverty; poor.

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2. People are … if some of their absolute needs are not sufficiently satisfied.

3. … demonstrates the cultural needs of individuals and families within the

context of the rest of society.

4. … exists for many centuries and can be defined in different ways.

5. … refers to a lack of the basic requirements to sustain physical life.

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1. There is no objective and unique definition of poverty, which demonstrates

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2. An absolute poverty line means a kind of fixed amount.

3. People are defined as “poor” when they can not sufficiently satisfy some of

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4. Most discussions distinguish between absolute or primary poverty and

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2. Relative
poverty
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4. poverty
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poverty by referring to the cultural needs of individuals and families

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d)… is lack of the basic requirements to sustain physical life.

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1. What is poverty? Is there objective and unique definition of poverty?

2. Does the content of the notion “poverty” differ from country to country and from time to time?

3. What did the poverty mean last century?
4. What kinds of poverty do most discussions distinguish between?

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