Предмет: Физика, автор: zavamops838

помогите пожалуйста 1,2,3,4 не обязательно

Приложения:

Ответы

Автор ответа: 05lemonade5
1

Ответ:

1а, 2в, 3в 4: 1б, 2в, 3а. Надеюсь, помогла

Автор ответа: ludmilaksenija2005
1

Объяснение:

1 — A

2 — B

3 — B

4 .

1 — B

2 — Б

3 — А

5.

Т=t/N

время вращения t=20 c

количество оборотов винта N=400 об

Т=20/400=0,05 с

ответ : 0,05 с

6.

длительность колебаний t=5c

частота колебаний v=440гц

количество колебаний n=?

v=n/t => n=vt

n=440•5=2200 колебаний.

ответ: 2200 колебаний.

7.

n=4

S=16 cм

за период 4 амплитуды.

А=S/(4•n)=16/(4•4)=1 см.

8.

частота вращения :V (ню)

Tм=1ч=3600 с

Tч=12ч=43200 с

Vм/Vч=?

V=1/T

Vм=1/Тм

Vч=1/Тч

Vм/Vч=1/Тм:1/Тч=1/Тм •Тч/1=Тч/Тм=

=43200/3600=12 раз

ответ: 12 раз

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