Предмет: Физика, автор: antoncheslis

определить температуру пара в нагревателе идеальной паровой машины если при КПД 15% температура холодильника 98 градусов цельсия

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Автор ответа: Данкоо1804

КПД= 1- Тх/Тн Отсюда Тн= Тх/1-КПД Тх= 273+98=371 371/1-0.15= 436

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Girls+maths=misery?The idea that girls have difficulty with maths is a common stereotype and there are sheets of statistics showing girls getting poorer results than boys in science and maths.But why?Are boys really better at these subjects?Or are girls being held back?There are slight genetic differences between both sexes at birth which may influence the subjects boys and girls choose," says Dr Sean Lyle, lecturer in education at Surrey University. "But the difficulty is that, by the time children reach school age, there areso many other influences that it is almost impossible to tell whether girls are worse at science and maths or whether they've been brought up to think of these subjects as unfeminine In maths at least, girls are equal to boys.A London University report suggests that girls only stop studying maths because of social attitudes.Valerie Walkerdine, one of the report's authors, says, While it is socially unacceptable for people not to be able to read and write, it is still acceptable for women to say that they are thick at maths.Our research shows that although girls get marks which are as good as the boys, they are not encouraged We nced to get rid of sexual stereotypes and the view that maths and science are masculine subjects.There is no doubt that sexism does exist in Britain's classrooms.A government report on maths teaching reveals that teachers seem to give more attention to the boys than the girls.When girls spoke out teacher did not like it.When boys did this, they were seen as being bright and a leader.As a result, the National Union of Teachers has a policy of re-educating teachers to view girls differently.
Outside school, parents can help by treating their daughters more like boys.Science subjects aren't casy, and boys benefit from the way they are encouragec to explore technical things when they are children.For example, boys are often asked to help with repairing the car while their sisters help with the tea At present, Britain is bottom of the European table for the number of girls studying maths at university.However, there are signs that the future is brighter as more attention is paid to the problem
вопросы
Choose the best answer according to the text.1 The text suggests that in maths.a girls are better than boys.b boys are better than girls.c girls are as good as boys.d girls are no good at all.2 Girls get poorer results in science because: a of their genes b it doesn't suit them c boys are better.d nobody encourages them.3 In Britain's maths classrooms a boys and girls are treated equally b oys get more attention than girls c girls get more attention than boys d teachers like girls to speak out 4 Parents can help girls improve in science by a asking them to help with the cooking.b asking them to help with technical things c treating the boys more like girls.d viewing science as a masculine subject.