Physics, 16.11.2019 06:31 liv467

Abicycle tire is spinning clockwise at 3.40 rad/s. during a time period δt = 2.50 s, the tire is stopped and spun in the opposite (counterclockwise) direction, also at 3.40 rad/s. calculate the change in the tire's angular velocity δω and the tire's average angular acceleration αav. (indicate the direction with the signs of your answers.)

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Answer from: Farhan54019

The change in the tire’s angular velocity is -3.4rad/s and the tire’s average angular acceleration is 2.72rad/s^2.

Explanation:

To solve this exercise we must go back to the kinematic equations of motion in which the angular velocity change is defined, and the expression derived from the expression from time and velocity. The equation of angular velocity change is given by:

$\Delta \omega = \omega_f - \omega_i$

Where \omega means the angular velocity.

Our values are given by:

$\omega_i = 3.4rad/s$

$\omega_f = -3.4rad/s$

There was a change in the direction of the speed.

Then the Total change of velocity is

$\Delta omega = -3.4-3.4 = -6.8rad/s$

We can know find the Acceleration of the object, which is given by,

$\alpha = \frac{\omega}{t}$

$\alpha = \frac{-6.8rad/s}{2.5}$

$\alpha = 2.72rad/s^2$

Therefore the change in the tire’s angular velocity is -3.4rad/s and the tire’s average angular acceleration is 2.72rad/s^2.

Answer from: lorip7799ov3qr0

The change in the tire's angular velocity is $6.80\frac{rad}{s}$ . The tire's average angular acceleration is $2.72\frac{rad}{s^2}$

Explanation:

Let's assume that the counterclockwise direction is the positive direction, then, as we were given the initial and final angular velocity (ω) and there is a direction change between them, we can calculate the change in angular velocity as

$\Delta\omega=\omega_{f}-\omega_{i}=3.40\frac{rad}{s}-(-3.40\frac{rad}{s})=6.80\frac{rad}{s}$

On the other hand, to calculate the average angular acceleration we have that

$\alpha_{av}=\frac{\Delta\omega}{\Delta t}$

we just calculated Δω, and Δt is given in the problem, therefore

$\alpha_{av}=\frac{\Delta\omega}{\Delta t}=\frac{6.80rad}{2.50s^2}=2.72\frac{rad}{s^2}$

is the average angular acceleration of the tire.

Answer from: Quest

quantum mechanics or quantum physics is physics of very small objects (particles) and physical entities.

quantum physics has some parallels to our macro world and some pretty unique ideas which theoretically and mathematically proven to be true even though we will never be able to access them because of our size.

there are many types of particles: subatomic, elementary etc.

subatomic means they are smaller than atom, elementary means they are at the very basis of everything.

subatomic particles are for eg. protons, neutrons but not electrons.

elementary particles are categorised into 3 groups by what they do.

these 3 groups are quarks, leptons and bosons.

light for example is a particle more precisely a photon a part of leptons.

proton (subatomic particle) is made out of 2 up quarks and 1 down quark each of these has a fractional charge like $\frac{1}{3}$ . (i crazy)

most famous scientist who contributed to this physics are:

max planckalbert einsteinerwin schrödingermany

the topic itself us understand a lot and will probably be vastly used in the future (quantum computers, understanding the big bang,

we also must not forget quantum effects like:

superposition (where 1 thing can be this and that at the same time),entanglement (where two particles are seemingly connected by some sort of unknown (or known) force, energy, matter (i know all that can be the same at least it was at the beginning)

and there is more. but probably too much for this answer to be consistent due to my average understanding of this topic.

hope this you understand quantum mechanics a little more. i'm not an expert in the topic (so don't be like wth if you are an expert) but i'm very interested in it.

anyways quantum physics is a very hard topic (harder than physics (perhaps)) therefore searching for every information there is about it and learning it is unfortunately impossible (you can only specialise into 1 - 3 things or more (perhaps

have fun and i wish you luck!

r3t40

Answer from: Quest

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

hope this ! this is not copied! search it up, it's free of plagiarism!