Physics, 19.08.2019 07:30 kita2911

Iknow that earth is spinning very fast but why don't we fell it spinning ?

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Answer from: 92054ggg

We never feel motion. What we feel is CHANGE in motion ... when either speed
or direction changes. That's why it's so easy to fall asleep on an airliner cruising
at a steady 500 miles an hour.

On the Earth, the speed doesn't change at all. The direction does change, because the Earth is spinning and your motion on it forms a circle every day.
But it takes 24 hours to describe a full circle of 360 degrees, so the direction
of your motion is changing only about 1/4 degree per minute, and that's not
enough to feel.

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

Planck decided to assume that atoms could only vibrate at certain frequencies that were whole numbers eg 2f, 3f and so on. others used to think that atoms vibrate continuously

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