+javoblar varaqasi fan: Fizika Sinf: chorak: Dars raqami

+JAVOBLAR VARAQASI
Fan: Fizika

Sinf: 7

Chorak: 2

Dars raqami: 25

Mavzu: 3-Nazorat ishi

O‘quvchining F.I.O: __________________________________________________ ____________________________________________________________________

I VARIANT

1-masala. Motosikl egrilik radiusi 400 m bo‘lgan burilishda 10 m/s tezlik bilan harakatlanmoqda. Avtomobil ning markazga intilma tezlanishini ( toping.

Berilgan: R = 400 m v = 0.4 m/s __________ =? Formula: Yechish: =100/400=0.25 Javob: 0.25

2-masala. Jism boshlang’ich 50 m/s tezlik bilan vertikal yuqoriga otildi. Agar jism10 m balandlikda turgan bo’lsa, 2 s dan keyin jism qanday balandlikda bo’ladi? g = 10

Berilgan: t = 2 s h1= 10m ________ h = ? Formula: h1+h2 = h Yechish: h2 h=h1+h2 = 10+4 = 14m Javob: 14m

3-masala. Yerdan 12 m balandlikdan boshlang’ich tezliksiz jism tushmoqda. Harakat boshidan 1 s o’tgach jism yerdan qanday balandlikda bo’ladi? g = 10

Berilgan: h = 12 m t = 1 s __________ h2=? Formula: → h1+h2 = h Yechish: h1 h2 = h - h1 = 12- 5 = 7m Javob: 7m

4-masala. Mashina g’ildiragining radiusi 20 cm. Bu g’ildiraklar 1 minutda 600 marta aylansa,mashinaning harakat tezligini toping.

Berilgan: R=20 sm=0.2m = 1min=60s = 600 ___________ Formula: Yechish: Javob:

5- masala. Yukni 0,4 m/s tezlik bilan ko’tarishda diametri 16 cm bo’lgan chig‘ir barabanining aylanish chastotasi qanday bo’lishini toping.
		http://library.ziyonet.uz/ru/book/download/8353	6 sinf Fizika darslik 92- bet 64-rasm
		Chig’iriq
	Berilgan: D = 16 sm =2R R=8sm=0.08m Formula: → Yechish: ≈ 0.8

JAVOBLAR VARAQASI
Fan: Fizika

Sinf: 7

Chorak: 2

Dars raqami: 25

Mavzu: 3-Nazorat ishi

O‘quvchining F.I.O: __________________________________________________ ____________________________________________________________________
II variant

1-masala. Ventilyator parragi aylanma harakat qilmoqda agar u 1 minutda 300 marta aylansa, uning aylanish chastotasi qanday (1/s)?
	https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.vectorstock.com%2Froyalty-free-vector%2Fventilator-icon-cartoon-style-vector-19673587&psig=AOvVaw1F4lD-QY1eqwwgeNXtJBwV&ust=1633366637671000&source=images&cd=vfe&ved=0CAkQjRxqFwoTCIj9jP74rvMCFQAAAAAdAAAAABAD	Рис -1.
	Ventilyator .
Berilgan: n=300 Formula: Yechish: Javob:

2-masala. Moрed 4 m/s tezlik bilan harakatlanmoqda. Moрed g‘ildiragining chekkasidagi nuqtani markazga intilma tezlanishi 40 . Moрed g‘ildiragining diametri qancha?

Berilgan: = 40 v = 4 m/s __________ =? Formula: Yechish: D=2R=0.8m Javob:

3-masala. Erkin tashlab yuborilgan jism tushish vaqtining oxirgi sekundida 45 m yo’lni bosib o’tgan bo’lsa, u qanday balandlikdan tushgan? g = 10 .

Berilgan: h2 = 45 m t2 = 1 s __________ h=? Formula: h1+h2 = h Yechish: → 45 = 40 m/s → 40=0+10⸱t1 ; t1 = 4 h = h2+ h1 = 45+80 = 125m Javob: 125m

4-masala. Massasi 3kg bo’lgan jism 35 m balandlikdan 15 m/s boshlang’ich tezlik bilan vertikal yuqoriga otildi. 2 s o’tgach jism qanday balandlikda bo’ladi? g = 10 .

Berilgan: Berilgan: h1= 35m t = 1 s______ h = ? Formula: h1+h2 = h Yechish: h=h1+h2 =35+10=45 Javob: h=45m

5-masala. Jism balandligi 15 m bo’lgan binodan 10 m/s boshlang’ich tezlik bilan vertikal yuqoriga otildi. Jism necha sekunddan keyin binoga qaytib tushadi? g = 10 .

Berilgan: h1= 15m ________ t = ? Formula: ↑↓ ko’tarilib tushish vaqti Yechish: = 2s Javob: 2s