Topic 2. Holidays and Travel
What will your dream holiday look like?
Where would you like to go?
Why will you choose this place?
What kind of activities can you do there?
Who will you go with?

Question

Физика: Topic 2. Holidays and Travel What will your dream holiday look like? Where would you like to go? Why will you choose this place? What kind of activities can you do there? Who will you go with?​

TimurA1 · Accepted Answer

X: l = v0t*cosα (3) ⇒ v0t = l/cosα (1)
y: h = v0t*sinα - gt²/2 (2)
Подставим (1) в (2) и найдем время полета:
h = (l/cosα)*sinα - gt²/2 = l*tgα - gt²/2
t = √2l*tgα/g (tg45° = 1)
t = √2*10^4м/9.8м/с² = 45,2 с
(3) v0 = l/ t*cosα = 316,5 м/с
vx = 316,5*0,7 = 221,5 м/с
vy = v0*sinα - gt = 221,5 м/с
По т. Пифагора: v = vx*√2 = 313,2 м/с (т.к. vx = vy)
Ек = mv²/2 = 3 кг * 313,2² м²/с² /2 = 147 кДж

Topic 2. Holidays and TravelWhat will your dream holiday look like?Where would you like to go?Why will you choose this place?What kind of activities can you do there?Who will you go with?​

MOGZ ответил

Topic 2. Holidays and Travel
What will your dream holiday look like?
Where would you like to go?
Why will you choose this place?
What kind of activities can you do there?
Who will you go with?