Physics, 22.07.2021 17:10 jessica2138

Xilanh 3 tầng cho như hình trên dùng để lật mui xe tải, khi đầy tải thì xilanh chịu lực tương đương 4000 kg tại mọi vị trí trên hành trình. Bán kính các tầng giảm dần: 100 mm, 80 mm, 60 mm. Lưu lượng bơm là 10 l/min, tính toán tốc độ tiến và áp suất yêu cầu cho mỗi tầng của xilanh.

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Answer from: Quest

Ais the

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

Answer from: Quest

Answer;

hot magma rises and pushes up toward the lithosphere, and as it cools it cycles back down toward the core to be heated again.

explanation; convection currents are the circular pathways taken by a fluid that enhances heat transfer by the process known as convection which occurs in fluids.convection currents transfer heat from one place to another by mass motion of a fluid. earth mantle is in a semi-liquid state and behaves like any other fluid, rising up from the bottom of the mantle after becoming hotter and less dense from heat of the earth's core, as the rock loses heat into the earth's crust it becomes cooler and more dense, then sinking back down to the core, then repeating the cycle.

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The answer is a your welcome

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Xilanh 3 tầng cho như hình trên dùng để lật mui xe tải, khi đầy tải thì xilanh chịu lực tương đương...

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