Предмет: Физика, автор: dinchikov

По уравнению координаты x(t)=-8+5t+2t^2 определить вид движения и найти координату тела через 7с

Ответы

Автор ответа: Аноним
0

Уравнение равноускоренного движения

x(t)=xo + Vox*t + (ax/2)*t²

        II        II              II

x(t)= -8  +   5 * t  +   (4/2) * t²

xo=-8 м;  Vox=5 м/с;  ax=4 м/с²

Движение равноускоренное.

х(7)= -8 + 5 * 7 + 2 * 7²=27 + 2*49=125 м   -   это ответ.

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GRAMMAR
Tick (✓) A, B, or C to complete the sentences. Example: They________fromRome.They’refrom
Florence.
A n o t ■ ■ B a r e n ’ t ■ ■✓ C i s n ’ t ■ ■
1 ‘Have you finished that report?’ ‘No, not ________.'
A just■ B already■ C yet■
2 What ________ you do yesterday afternoon?
A are■ B did■ C do■
3 I ________ in the park when it started raining.
A sat ■ B wassitting ■ C sit ■
4 ‘________ you ever been to the museum?’ first time.’
‘No, this is the
A Had■ B Has■ C Have■
5 He couldn’t remember where he ________ his car.
A had parked ■ B was parking ■ C hasparked ■
6 We ________ work tomorrow.
A haven’tto ■ B don’thaveto ■ C mustto ■
7 I ________ the gym on Thursday evenings.
A go usually to ■ B always go ■ C oftengoto ■
8 I put ________ salt in the pasta.
A alittle ■ B toomany ■ C afew ■
9 Hello! Come in. I’ve ________ made some coffee. Would you like some?
A just■ B already■ C yet■
10 ‘I don’t want to rent a horror film.’ ‘________ do I.’
A Neither ■ B So ■ C Either ■
11 ________ in the sea makes you really strong.
A Swim ■ B Swimming ■ C Swiming ■
12 It’s snowing. ________.
A Putting your hat on ■ B Your hat put on ■ C Putyourhaton ■
13 A key is a thing ________ you use to open doors.
A where■ B which■ C who■
14 ________ to the basketball match on Saturday?
A Areyougoing ■ B Doyougo ■
C Willyougo ■
15 She ________ invite him if she didn’t want him to come.
A won’t ■ B not ■ C wouldn’t ■
16 I need some advice. What ________ I do? A should ■ B must ■ C could ■
17 This castle ________ in 1600.
A was built ■ B built ■ C was build ■
18 I don’t have ________ money left, because I bought a new jacket.
A much■ B many■ C lots■
19 He ________ me not to tell anyone.
A say■ B told■ C said■
20 What ________ you do if she doesn’t reply to your email?
A will■ B would■ C do■
21 Let’s order a pizza. We don’t have ________ to cook for dinner.
A nothing ■ B anything ■ C something ■
22 They’ve lived in the same house ________ forty years.
A for■ B since■ C ago■
23 I ________ come and see you tonight if I can borrow Joe’s car.
A must ■ B might ■ C haveto ■ 24 I think this is the ________ song on the CD.
A better ■ B mostbest ■ C best ■ 25 That case is too heavy for you. I ________ you.
A ’llhelp ■ B help ■ C ’mgoingtohelp ■