Предмет: Физика, автор: Victoria69v

. Человек массой 50 кг прыгнул с берега в неподвижную лодку на воде со скоростью 36 км/час. С какой скоростью станет двигаться по воде лодка вместе с человеком в первый момент после прыжка человека, если масса лодки 45 кг?

Ответы

Автор ответа: moskvichevaevelina
0
По закону сохранения импульса
M1*V1=(m1+m2)*V
V=m1*V1/(m1+m2)=50*8/(50+45)=4,3 м/с вроде так
Похожие вопросы
Предмет: Английский язык, автор: rai007
a Complete the spaces with have, go ,or get.
1) First Moira Macalla , from Dundee in Scotland.I __ up at 7.30 and  I make the breakfast for  my children to school. then i __shopping. I go to the supermarket and buy food and thing for the house . When I__ home i make the beds and clean the house . I___ shower before I pick up the children from school  at  four o`clock . In the evening we ___ ndinner and watch television . I ___ to bed at 10.30 because I`m very tired.
2) Eve Standish is from Bristol in South West England.
I___ up at 10 o`clock and ___ fruit  and  an orange juice for breakfast . Then I ___ a bath and get dressed . At 11.30 I meet my friends  in the city centre . First  we___ a coffee , and then  we __ shopping . We usually  __  lunch at abot  one o`clock in a restaurant  in town . In the afternoon  we sometimes  ___ to the gym. When I ___  home , I ___ a drink  with  my husband.  In the evenning  we ___ to the  theatre  or ti nithclub. I normally ___ to bed very late.
   
b) Write questions about  Moira or Eve .
1 What time does Moira get up ?
She gets  up at 7.30
2 Does Eve have breakfast ?  
Yes , she does . She has fruit and orange juice.
3___________________ in the morning?
No, she doesn`t . She has a shower in the afternoon .
4 Where____________________________ ?
She meets  her friends in the city centre.
5 What  ___________________________?
She  has dinner  and watches television.
6 What time ____________________ ?
She goes  to bed at 10.30
7______________________________?
No , goes doesn`t . She goes to bed late.
Предмет: История, автор: 898323