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Задача Хлопчик тягне по сныгу санчата, прикладаючи горизонтальну силу 80H. Санчата рухаются прямолінійно рівномірно. Визначте коефіцієнти тертя ковзаня санчат по снігу , якщо сила нормальної апори, що діє на санчата дорівнює 320H. Виконайте рисунок, на якому зобразіть сили що діють на санчата.СРОЧНОООО ПОМОГИТЕ ДАЮ 45 БАЛОВ
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стрілка, яка вказує вгору, представляє силу тяги, стрілка, яка вказує вниз, представляє силу тертя ковзання, а стрілка, яка вказує вниз, - це сила нормальної апори.
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Автор:
cloeey2o - 8 месяцев назад
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Forum4Fitness
3 Read
a
Read the text and tick () two correct answers.
The article is written for people who...
A enjoy doing exercise.
C want to get fit.
B haven't done much exercise before.
D are making mistakes while they are exercising
ForumiFitness
BOD
Getting started
So you've decided it's time to get fit? You're
aiming to do at least 30 minutes of physical
exercise five days a week? Great! But if you've
never done much exercise, you probably aren't
sure how to begin. Here are some useful tips.
Beginners often try to do too much too soon.
Start with an activity like walking, which makes
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day. When you can do this easily for 30 minutes,
you can start doing more energetic activities.
Keeping fit depends on getting into a routine.
Make a plan so that exercise becomes a part of
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with friends) and do them regularly.
Are the sentences right () or wrong (X)?
Warming up for 5-10 minutes is very important. It
slowly raises your temperature and prepares your
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People often hope to lose weight and get more
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1 The writer is giving advice for starting an exercise programme.
2 At first, you should exercise for half an hour every day.
3 While you are exercising, your heart beats more quickly than usual.
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5 A warm-up helps your body to get warm very quickly.
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b
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