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
tankabanditka [31]
3 years ago
14

Which of the following is an example of acceleration?

Physics
2 answers:
kompoz [17]3 years ago
6 0

Answer:

B) a leaf blown from a tree by the wind

olga55 [171]3 years ago
4 0

Answer:

the answer is B A leaf being blown from a tree by the ground

You might be interested in
A bug is 12 cm from the center of a turntable that is rotating with a frequency of 45 rev/min . What minimum coefficient frictio
Agata [3.3K]

Answer:

The minimum coefficient of friction is 0.27.

Explanation:

To solve this problem, start with identifying the forces at play here. First, the bug staying on the rotating turntable will be subject to the centripetal force constantly acting toward the center of the turntable (in absence of which the bug would leave the turntable in a straight line). Second, there is the force of friction due to which the bug can stick to the table. The friction force acts as an intermediary to enable the centripetal acceleration to happen.

Centripetal force is written as

F_c = m\frac{v^2}{r}

with v the linear velocity and r the radius of the turntable. We are not given v, but we can write it as

v = r\omega

with ω denoting the angular velocity, which we are given. With that, the above becomes:

F_c = m\frac{v^2}{r}=m\omega^2 r

Now, the friction force must be at least as much (in magnitude) as Fc. The coefficient (static) of friction μ must be large enough. How large?

F_r=\mu mg \geq m\omega^2 r = F_c\implies\\\mu \geq \frac{\omega^2 r}{g}

Let's plug in the numbers. The angular velocity should be in radians per second. We are given rev/min, which can be easily transformed by a factor 2pi/60:

\frac{1 rev}{1 min}\cdot\frac{\frac{2\pi rad}{rev}}{\frac{60s}{1 min}}=\frac{2\pi}{60}\frac{rad}{s}

and so 45 rev/min = 4.71 rad/s.

\mu \geq \frac{\omega^2 r}{g}=\frac{4.71^2\frac{1}{s^2}\cdot 0.12m}{9.8\frac{m}{s^2}}=0.27

A static coefficient of friction of at least be 0.27 must be present for the bug to continue enjoying the ride on the turntable.



3 0
2 years ago
Which of the following is NOT true about a pool of water and a piece of ice? A They have the same composition. B They are in dif
anastassius [24]
C. They have different chemical properties.
7 0
3 years ago
Read 2 more answers
PLEASE HELP ASAP WILL REWARD BRAINLIEST:))
laiz [17]

Answer:

120s^-1

Explanation:

v=12v

I=10A

and since rate is with time, therefore rate=energy/time.

H=IV

10×12=120/s

therefore the rate is 120s^-1

6 0
2 years ago
Which scientist proved experimentally that a shadow of the circular object illuminated 18. with coherent light would have a cent
Zina [86]

Answer:

Your answer is( D) - Arago

8 0
3 years ago
un fir de cauciuc de lungimea 1 m si sectiunea 10mm patrati se alungeste acu 1 cm ce marime are forta de deformare
Nady [450]
Sorry most of speak english on this website so i cannot help you
3 0
3 years ago
Other questions:
  • Why is it necessary to be able to replicate the results of a scientific experiment
    12·1 answer
  • Mechanics: design a decision tree to determine if an object is experiencing an unbalanced force, and using newton's laws of moti
    10·1 answer
  • PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! IM DESPERATE!!!!!!!!!!!!!! EVEN IF YOU DONT KNOW , GIVE A GUESS. What would
    10·1 answer
  • An opera singer breaks a crystal glass with her voice. Which best explains why this occurs?
    9·2 answers
  • The index of refraction of silicate flint glass for red light is 1.620 and for violet light is 1.660 . A beam of white light in
    11·1 answer
  • A car traveling at 37m/s starts to decelerate steadily. It comes to a complete stop in 15 seconds. What is it’s acceleration
    15·1 answer
  • SCALCET8 3.9.018.MI. A spotlight on the ground shines on a wall 12 m away. If a man 2 m tall walks from the spotlight toward the
    14·1 answer
  • 4. During which three months is the difference the same between average high temperature and average low temperature?
    15·1 answer
  • When an apple falls towards the earth,the earth moves up to meet the apple. Is this true?If yes, why is the earth's motion not n
    8·1 answer
  • A net force must be acting when an object Choose one or more: A. changes direction but not speed. B. changes both speed and dire
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!