2)
дано:
m=20h
v=10дм3=0,01м3
p=1000кг/м3
f-? h
решение:
найдем силу архимеда: fарх=pgv=1000кг/м3*10м/с2*0,01м3=100h
найдем вес тела: p=mg=2кг*10м/с2=20h
найдем силу: f=fарх-p=100h-20h=80h
4)
находим по таблице плотность мрамора - 2500—2800 кг/м³,
примем - 2500кг/м.куб
найдём обьем - 1000кг / 2500кг/м.куб=0.4м.куб
на тело обьёмом 0.4 м.куб действует выталкивающая сила равная весу вытесненной жидкости, вес 0.4 м.куб воды равен p= v*p*g=0.4 м.куб *1000кг/м.куб*10 м/с.кв= 4000н,
вес мрамора р=m*g= 1000кг*10м/с.кв= 10000н
вес мрамора в воде р=10000н - 4000н = 6000н
соответственно и сила нужна 6000н = 6лн
если не ошибаюсь,то так.
1. Sally was 18 when she became one of the best young tennis players in the USA.
2. Literature - is one of Sally Ride’s favorite subjects.
3. Sally was engaged in learning astrophysics in college.
4. She was a specialist in astrophysics.
5. She learned to control military jets as part of her training in Houston.
6. Sally spent six day in space flying around the earth.
Объяснение:
She was ranked number eighteen among the best young tennis players in the country when she was 18."-1 вопрос,получается ответ вместо пропуска 18
"She liked great literature too."-2 вопрос ответ literature
When she went to college, she studied astrophysics." - 3 вопрос,ответ "college"
She was a specialist in astrophysics." - ответ на 4 вопрос "astrophysics"
She studied at the Johnson Space Center in Houston, Texas. She learnedhow to fly military jets as part of her training."- ответ на 5 вопрос "military jets as part of her training"
Sally ride spent six days in space orbiting the earth"- значит ответ "six"
