Предмет: Физика, автор: KbVlad

Материальная точка массой 1кг равномерно движется по окружности со скоростью 10 м/с. Найдите модуль изменения ее импульса за 4,5 оборота

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Автор ответа: firsov1959ot9mis

Через 4,5 об вектор скорости направлен противоположно начальной скорости.|ΔP|=2mV=2*1*10=20 кг*м/с

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ЭТО РЕКОРДНЫЙ ВОПРОС В ЗНАНИЯ.КОМ
НА ЭТОТ ВОПРОС НИ КТО НЕ ОТВЕТИТ!

Write full positive sentences (полные утвердительные предложения) in Present Perfect. Don't use full stops, they are given.

1. Mary ________ a test. (fail)

.

2. My sister ______ her tasks. (do)

.

3. Cathy ________ the vase. (break)

.

Write full negative sentences. Don’t use short forms and full stops (they are given).

1. Jake has bought souvenirs for friends.

.

2. Jack and Mike have seen a new manager.

.

3. She has sold her car.

.

Write general questions. Don't use question marks (they are given):

1. She has turned off the printer.

?

2. They’ve attached a photo of their house.

?

3. Mike has returned from the shops.

?

Write these words in the correct order. Use punctuation marks:

1. ocean/sailed/across/I/an/ever/have?

2. it/ever/snowed/has/July/in?

3. ever/have/had/you/at 8 am/ice cream?

Use the correct form of the verbs. Present Perfect or Past Simple. Write the full verb form.

1. I
Thai food. (try)

2. My sister
me her CD player yesterday. (give)

3. I
my friends today. (not phone)

Change the third form into the first form:

Example 0.

flown
Answer 0.

fly
1. grown
2. understood
3. fought

Write the third form of the verb.

Example 0.

rise
Answer 0.

risen
1. swim
2. take
3. grow

Choose the third form:

1.
given
givens
gave

2.
hear
hears
heard

3.
chose
choses
chosen

Choose the third form:

1.
driven
drove
drives

2.
known
knows
knew

3.
sell
sold
selling

Here are the words but the letters are mixed up. Write the correct variant.

Example 0.

fectper
Answer 0.

perfect
1. eenb
2. ntlyrece
3. inces

Write general questions. Don't use question marks (they are given):

1. They have logged on to the computer.

?

2. Cara has seen Red Square.

?

3. Mike has returned from the shops.

?

Write full negative sentences. Don’t use short forms and full stops (they are given).

1. They have visited the Colosseum.

.

2. They have watched a scary film.

.

3. I have pulled a muscle.

.

Write full positive sentences (полные утвердительные предложения) in Present Perfect. Don't use full stops, they are given.

1. We already ________ a tasty salad. (cook)

.

2. My sister ______ her tasks. (do)

.

3. Cathy ________ the vase. (break)

.

Complete these sentences using «never» and the verb. Write only the verb form with never.

1. My parents ____________ on an ocean (sail).

2. Lara and Holly ___________a computer (use).

3. My parents ___________ English (speak).

Fill in the gaps with «just» and the correct form of the verbs:

1. Oh! I
my mum’s vase. (break)

2. We
from holiday. (come back)

3. Tina
me with shopping. (help)

Write these words in the correct order. Use punctuation marks:

1. has/Jim/met/a diver near the beach/ever?

2. you/been/have/to/ever/Australia?

3. ever/have/had/you/at 8 am/ice cream?

Fill in the gaps with «just» and the correct form of the verbs:

1. Your dog
my sandwich! (eat)

2. Mary and Kate
this problem. (solve)

3. Tim and Liz
a cake. (cook)
Complete these sentences using «never» and the verb. Write only the verb form with never.

1. My parents ____________ on an ocean (sail).

2. You__________ a dinosaur (find).

3. My parents ___________ English (speak).

Use the correct form of the verbs. Present Perfect or Past Simple. Write the full verb form.

1. I
my homework yet. (not do)

2. I
lots of new songs. (download)

3. I
my friends today. (not phone)

Write 6 questions with the word «ever» using Present Perfect.

Fill in the gaps with «just» and the correct form of the verbs:

1. I
the good news. (hear)

2. She
me. (phone)

3. I
her about this situation. (tell)

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