Решить ! 1) на меньшее плечо рычага действует сила 300н, на большее- 20н. длина меньшего плеча 5см. определите длину большего плеча. 2) на концах рычага действует силы 40н и 240н, расстояние от точки опоры до меньшей силы 6см. определите длину рычага, если рычаг находится в равновесии. 3) на концах рычага действуют силы 25н и150н. расстояние от точки опоры до большей силы 3см. определите длину рычага, если под действием этих сил он находится в равновесии.

1)

f1*d1=f2*d2

d2=75cм

2)f1*d1=f2*d2

d2=1cm

d=d1+d2=7cm

3)f1*d1=f2*d2

d1=18cm

d=d1+d2=21cm

1)  x1=20    x2=200    t=120 c

vx=(x2-x1)/t=(200-20)/120=1.5 м/с

2) t1=2c    x1=4 м    t2=4 c    x2=0

vx=(x2-x1)/(t2-t1)=(0-4)/(4-2)= - 2 м/с

3) s1=60 км    v1=20 км/ч      s2=60 км    v2=30км/ч

vcp=(s1+s2)/(t1+t2)

t1=s1/v1=60/20=3 ч    t2=s2/v2=60/30=2 ч

vcp=(60+60)/(3+2)=24 км/ч

4) vo=15 м/с    t=10 c

s=(v+vo)*t/2        v=0

s=(15+0)*10/2=75 м

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аквпикнр5е6пкраеркврин526462еач5кигач5а. 256н6е6а5крнпмннмн7м6пм6пм6пир7ир6мр6м6емнпмнпмнпву4а6ем4аеRead the text again and write next to the sentences True/False according to the text.

1. She looks after the big animals.

2. Her favorite animals are the tigers.

3. There are four elephants at the zoo.

4. Molly gets up at 6 o'clock.,

5. The lions eat salad.

6. The animals drink water.Read the text again and write next to the sentences True/False according to the text.

1. She looks after the big animals.

2. Her favorite animals are the tigers.

3. There are four elephants at the zoo.

4. Molly gets up at 6 o'clock.,

5. The lions eat salad.

6. The animals drink water.Read the text again and write next to the sentences True/False according to the text.

1. She looks after the big animals.

2. Her favorite animals are the tigers.

3. There are four elephants at the zoo.

4. Molly gets up at 6 o'clock.,

5. The lions eat salad.

6. The animals drink water.Read the text again and write next to the sentences True/False according to the text.

1. She looks after the big animals.

2. Her favorite animals are the tigers.

3. There are four elephants at the zoo.

4. Molly gets up at 6 o'clock.,

5. The lions eat salad.

6. The animals drink water.Read the text again and write next to the sentences True/False according to the text.

1. She looks after the big animals.

2. Her favorite animals are the tigers.

3. There are four elephants at the zoo.

4. Molly gets up at 6 o'clock.,

5. The lions eat salad.

6. The animals drink water.

Объяснение:

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