Предмет: Физика, автор: 007gaglik

В лежащий на длинном столе деревянный брусок массой M попадает летящая горизонтально со скоростью V пуля массой m и застревает в нём. Сколько времени после этого брусок будет скользить по столу, если коэффициент трения между столом и бруском равен μ?

Ответы

Автор ответа: fatt52

Δv=v
m*Δv=F*Δt
F=μ*N=μ*(M+m)*g
Δt=m*v/(μ*(M+m)*g)
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Автор ответа: 007gaglik

А можете это все словами еще объяснить пожалуйста)

Автор ответа: fatt52

Забыли массу пули в бруске. Изменение импульса равно импульсу силы

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Read the text and answer the questions:
What will we eat in the future?
By 2050, the Earth's population will be about ten billion. This means we will need to increase food production to
feed almost three billion more people. But how can we do that without destroying the planet?
In the past, whenever we needed to produce more food, we simply cut down forests or ploughed grasslands to
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techniques such as hydroponics and aeroponics, allowing farmers to grow plants without any soil
Another solution is genetically modified food. Scientists are trying to create super plants which will grow faster
and require less water, fertiliser or pesticides. To do this, they change the genes of the plants seeds. They can do
the same with animals, too, and they have even managed to grow meat in labs in the near future a single ce
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meat from real farm animals. But will people eat it?
Some scientists are worried about the possible effects of genetically modified food on peoples health so they
are trying to find ways to make better use of the resources we already have. Insects, for example a great source
of protein and they don't need as much space or water as farm animals. Aquaculture or ocean ferms could also
provide a solution to the future food crisis.
Answer the question:
1. When will the Earth's population be about ten billion