-
Мощность двигателя подъемной машины равна 4 кВт. Какой груз она может поднять на высоту 15 м в течении 2 мин? Можно с полным объяснением. Даю 30 баллов
Ответы 1
-
Работа необходимая для подъема A=m*g*hРабота двигателя A=N*tПо закону сохранения энергии N*t=m*g*hm=N*t/g*h=4000*120/10*15=3200 кг
-
Автор:
francis42 - 6 лет назад
-
0
-
-
Добавить свой ответ
Еще вопросы
-
Помогите
Variant I
Listening
1. Listen and circle which sport do children like:
2. Listen again and put T (true) or F (False):
Vocabulary and Grammar
1. Write as in the example:
e.g. сamera 5................................. 6..............................
7................................ 8................................... 9..................................
2. Write nationalities:
e.g. Germany – German
10 Japan - ............................................ 13 Brazil - ............................................
11 Britain - ........................................... 14 Spain - ............................................
12 Poland - ...........................................
3. Complete the sentences with a correct word:
● capital ● twins ● late ● north ● deserts ● slim ● credit ● nationality ● wavy ● driving ● middle
e. g. Bob has got two credit cards.
15 Mike's hair is short and ...................... 20 Susan is tall and ................... with long, dark hair.
16 Paris is the.......................................city of France. 21 Milan is in the ............................................ of Italy.
17 Peter has got two sisters. They are.................... 22 In Africa there are a lot of.................................
18 His father is a ...........................-aged man. 23 "What.................................. is he?" "He's Canadian."
19 My grandparents are in their ........................ sixties. 24 Have you got a ....................................... licence?
4. Underline the correct word:
e. g. This blue car over there is their/theirs.
25 Their/Theirs house is very modern. 30 This little puppy isn't our/ours.
26 Meg has got a new flat. Her/Our flat is spacious. 31 Tom and Sarah are my/mine friends
27 Is Ben yours/your brother? 32 What is his/hers address?
28 Are these books her/hers? 33 What's yours/her phone number?
29 This camera isn't mine/my. 34 Is this football his/her?
5. Choose the correct item:
e.g. There are two paintings the wall.
A in B on
35 "Where's the cat?" "She's ....................... the table."
A between B under 38 John sits ........... Pete in class. They are good friends.
A on B next to
36 Mike sits the computer all day.
A in front of B in 39 "Where's the newspaper?" "It's ............... the
table."
A on B behind
37 I put the flowers a vase.
A opposite B in 40 Our house is .............. the park and the cinema.
A under B between
-
Предмет:
Английский язык -
Автор:
levi9 - 6 лет назад
-
Ответов:
0 -
Смотреть
-
-
решить уравнееие х=2,2=-3,3
-
Предмет:
Математика -
Автор:
josefinapgbb - 6 лет назад
-
Ответов:
0 -
Смотреть
-
-
Запишите числитель и знаменатель дроби в виде целых чисел и сократите:
1)(-0,25)*0,51
___________
0,05* 0,17-
Предмет:
Математика -
Автор:
ruffecosta - 6 лет назад
-
Ответов:
1 -
Смотреть
-
- что значит выражение "в жизни нужно обгонять себя, а не других"?
Топ пользователей
-
Fedoseewa27
35934 -
Devilian
2792 -
Pikachu
2228 -
hobbesbowers
2120 -
kaylynnbarron676
1818 -
女fei
1240 -
yulia-kaplina
1158 -
Poinntt
946 -
Bars
930 -
Queenmagic18
770
How much to ban the user?
1 hour
1 day
100 years