Предмет: Физика, автор: Darinochochochka

1.Какая сила больше 800Н или 4кН и в сколько раз?
А) 800Н больше чем 4кН в 10 раз;
Б)800Н меньше чем 4кН в 5 раз;
В)800Н меньше 4кН в 100 раз.
2.Давление жидкости вымеривают:
А)Термометром.
Б)Динамометром.
В)Манометром.
3.Вид теплообмена,в котором енергия переносится струменями газа,или жидкости называется..:
А)теплопроводность
Б)излучение
В)поглощение
Г)конвекция
ЗАДАЧА
За 2 сек. человек проходит 1.5 м.Определите скорость равномерного движения человека.
ЗАДАЧА
Какой коэффициент трения,если на тело весом 500Н действует сила трения размером 40Н?
ЗАДАЧА
Какой обьем куска меди,если в воде на него действует выталкивающая сила 100Н?
Плотность меди 8.9 г/см в кубе.
ПОМОГИТЕ ПОЖАЛУЙСТА

Ответы

Автор ответа: DeathMan
1
1. Б (4кН/800Н= 4000/800=5)
2. В
3. Г


Darinochochochka: спасибочки)
Автор ответа: dmitrijfrol201
2
Б)800Н меньше чем 4кН в 5 раз;
В)Манометром.
Г)конвекция
1задача -1,5/2=0,75 м/с
2задача- 
F-Fтр-mg=0  Fтр=460Н
3задача:
m=pV = 8.9* 100/89  = 10 кг






Darinochochochka: спасибочки)
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