Physics, 18.10.2021 07:20 ajernandes01

1. Một khối trụ đặc đồng chất, khối lượng m= 0,5kg bán kính R bắt đầu lăn không trượt từ đỉnh một mặt phẳng nghiêng dài 2m, góc nghiêng α. Biết vận tốc dài của tâm trụ đặc khi lăn đến chân mặt phẳng nghiêng là v=2spr2 m/s, mômen quán tính của khối trụ I=mR^2/2 /2. Hãy tính:
a, Gia tốc của tâm khối trụ và góc nghiêng α.
b, Công và công suất trung bình của trọng lực trong quá trình chuyển động

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Answer from: Quest

Sound energy is produced when an object vibrates. examples are 1- a balloon popping2-a whistle3- a waterfall

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

Perhaps seek some professional ? it isn't very asking some children who are just trying to find out answers to homework.also, it seems professional would actually be good to you. obviously it isn't going to magically fix your depression, but it'll do something. drugs, smoking weed, it won't do much, especially if your husband is against it. if you do it he'll dislike it. but talk to him, try and get him to listen to you, and figure everything out together, okay? there's a website- maybe it can offer some ?

Answer from: Quest

Dshould be the right answer i think

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1. Một khối trụ đặc đồng chất, khối lượng m= 0,5kg bán kính R bắt đầu lăn không trượt từ đỉnh một mặ...

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