1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
olga2289 [7]
3 years ago
14

A bicycle 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 opposi

te (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.)
Physics
2 answers:
disa [49]3 years ago
4 0

Answer:

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.

Finger [1]3 years ago
3 0

Answer:

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, <u>we can calculate the change in angular velocity as</u>

\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}

<em>we just calculated Δω, and Δt is given in the problem</em>, 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.

You might be interested in
Does anyone know this one? Thanks
Inessa [10]

Answer:

3.844\,*\,10^5

So a=3.844 and b=5

Explanation:

Scientific notation requests to write a number using powers of ten as a factor accompanying a real number (a) between 1 and smaller than 10 that contains the digits to exactly represent the original number. So in this case, the number 384,400 can be written as:

384,400=3.844 \,*\,100,000= 3.844 \,*\,10^5

with a=3.844, and "5" as the exponent of ten (so b=5)

6 0
3 years ago
What has been happening to the cosmic microwave background radiation since the Big Bang?​
kondor19780726 [428]

Answer:

Explanation:

Cosmologists refer to a "surface of last scattering" when the CMB photons last hit matter; after that, the universe was too big. So when we map the CMB, we are looking back in time to 380,000 years after the Big Bang, just after the universe was opaque to radiation. But the CMB was first found by accident.

plz mark as brainliest

6 0
3 years ago
The rocket's acceleration has components \(a_{x}(t)= \alpha t^{2}\) and \(a_{y}(t)= \beta - \gamma t\), where \(\alpha = 2.50 {\
lbvjy [14]
 it is just a matter of integration and using initial conditions since in general dv/dt = a it implies v = integral a dt 
v(t)_x = integral a_{x}(t) dt = alpha t^3/3 + c the integration constant c can be found out since we know v(t)_x at t =0 is v_{0x} so substitute this in the equation to get v(t)_x = alpha t^3 / 3 + v_{0x} 
similarly v(t)_y = integral a_{y}(t) dt = integral beta - gamma t dt = beta t - gamma t^2 / 2 + c this constant c use at t = 0 v(t)_y = v_{0y} v(t)_y = beta t - gamma t^2 / 2 + v_{0y} 
so the velocity vector as a function of time vec{v}(t) in terms of components as[ alpha t^3 / 3 + v_{0x} , beta t - gamma t^2 / 2 + v_{0y} ] 
similarly you should integrate to find position vector since dr/dt = v r = integral of v dt 
r(t)_x = alpha t^4 / 12 + + v_{0x}t + c let us assume the initial position vector is at origin so x and y initial position vector is zero and hence c = 0 in both cases 
r(t)_y = beta t^2/2 - gamma t^3/6 + v_{0y} t + c here c = 0 since it is at 0 when t = 0 we assume 
r(t)_vec = [ r(t)_x , r(t)_y ] = [ alpha t^4 / 12 + + v_{0x}t , beta t^2/2 - gamma t^3/6 + v_{0y} t ] 
5 0
3 years ago
Which of the following is a potential result of preparing appropriately before starting an experiment in a lab?
oksano4ka [1.4K]

Answer:

Your project goes well.

Explanation:

Because that's how it works.

6 0
3 years ago
Juan is receiving bills from the hospital even though his insurance company said his procedure would be covered in full. What st
BaLLatris [955]

==> Jot down notes before and after making each call, and avoid calling during business hours when people are busy.

==> Save all emails and bills, and follow up to make sure people did what they said they would do.

5 0
2 years ago
Other questions:
  • Rearrange the equation for density to solve for mass.
    11·1 answer
  • Tools to use to find volume of regular shape
    6·1 answer
  • A man holding a rock sits on a sled that is sliding across a frozen lake (negligible friction) with a speed of 0.460 m/s. The to
    14·2 answers
  • A 49-year-old female was referred for mammography, but she is very apprehensive after reading about the risk of ionizing radiati
    7·1 answer
  • Descreva sucintamente como ocorre a formação do raio x pela ampola ou tubo
    6·1 answer
  • In a World Cup soccer match, Juan is running due north toward the goal with a speed of 7.60 m/s relative to the ground. A teamma
    9·1 answer
  • A bullet is fired vertically upward a velocity of 80m/s to what height will the bullet rise above the point of projection​,note:
    5·1 answer
  • How much would you have to eat for your appendix to explode ? I ate so much on thanksgiving and i need to know i’m very scared
    9·1 answer
  • Why are multiple images seen when two plane mirrors are placed at an angle​
    5·1 answer
  • The gravitation force between two masses (36n if the distance between masses is tripled, the force of gravity will be).
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!