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
Tcecarenko [31]
3 years ago
13

A machine part has the shape of a solid uniform sphere of mass 215 g and diameter 3.10 cm . It is spinning about a frictionless

axle through its center, but at one point on its equator it is scraping against metal, resulting in a friction force of 0.0200 N at that point.Find its angular acceleration. Let the direction the sphere is spinning be the positive sense of rotation.
Physics
1 answer:
sineoko [7]3 years ago
6 0

Answer:\alpha =15 rad/s^2

Explanation:

Given

mass of sphere\left ( m\right )=215 g

diameter\left ( d\right )=3.10 cm

Friction Force=0.02 N

here friction force will provide torque

thus f_r\times r=I\times \alpha

0.02\times r=\frac{2mr^2}{5}\times \alpha

\alpha =\frac{0.02\times 5\times r}{2\times m\times r^2}

\alpha =\frac{5\times 0.02}{2\times 0.215\times 1.55\times 10^{-2}}

\alpha =15 rad/s^2

You might be interested in
What is the main function of a cell
Andre45 [30]

Answer:

they provide structure and support, facilitate growth through mitosis, allow passive and active transport, produce energy, create metabolic reactions and aid in reproduction.

Explanation:

they provide six main functions.

5 0
3 years ago
At this rate, how long would it take for two continents 3500 kilometers apart to collide?
meriva

<span>Given:

3,500 kilometers

Find:</span>

 

Years for two continents to collide = ?

 

<span>Solution:

We know that </span>typical motions of one plate relative to another are 1 centimeter per year.

So first, we convert 3,500 km to cm.<span>
</span><span>

</span>

The solution would be like this for this specific problem:

 

1 km = 100,000 cm

3,500 km x 100,000 = 350,000,000 cm

Since we know that 1 cm = 1 year, then that means 350,000,000 cm is equivalent to 350,000,000 years.

 

Therefore, it would take 350 million years for two continents that are 3500 kilometers apart to collide.

<span>
To add, </span>a phenomenon of the plate tectonics of Earth that occurs at convergent boundaries is called the continental collision.

5 0
3 years ago
A Carnot engine operates with an efficiency of 26.0% when the temperature of its cold reservoir is 281 K. Assuming that the temp
VLD [36.1K]

Answer:

The temperature of cold reservoir should be 246.818 K for efficiency of 35%

Explanation:

In first case we have given efficiency of Carnot engine = 26 % = 0.26

Temperature of cold reservoir T_L=281K

We know that efficiency of Carnot engine is given by

\eta =1-\frac{T_L}{T_H}

0.26 =1-\frac{281}{T_H}

T_H=379.72K

For second Carnot engine efficiency is given as 35% = 0.35

And temperature of hot reservoir is same so T_H=379.72K

So 0.35=1-\frac{T_L}{379.72}

T_L=246.818K

So the temperature of cold reservoir should be 246.818 K for efficiency of 35%

4 0
4 years ago
A motorcycle accelerates from at a rate of 4m/s 2 while traveling 60m what it’s the motorcycles velocity at the end of this moti
fenix001 [56]

Answer: C

Explanation: 60 divided by 4 =15

5 0
3 years ago
An automobile with passengers has weight 19.4 kN and is moving at 108 km/h when the driver brakes to a stop. The frictional forc
mixer [17]

Answer:

12.0

Explanation:

4 0
3 years ago
Other questions:
  • How do you raise the frequency of a guitar string?
    12·1 answer
  • The Hubble Space Telescope orbits the Earth at approximately 612,000m altitude. Its mass is 11,100 kg and the mass of earth is 5
    14·1 answer
  • 4) Kinetic energy is directly related to _______
    5·1 answer
  • Water runs into a fountain, filling all the pipes, at a steady rate of 0.750 m3&gt;s. (a) How fast will it shoot out of a hole 4
    10·1 answer
  • Match each term with the best description. DispersionRayRefractive indexSnell's lawTotal internal reflection Ratio of the speed
    8·1 answer
  • Two 100 kg bumper cars are moving toward each other in opposite directions. Car A is moving at 8 m/s and Car B at –10 m/s when t
    6·1 answer
  • A suspicious-looking man runs as fast as he can along a moving sidewalk from one end to the other, taking 2.50 s. Then security
    7·2 answers
  • Julie and Ashwin were doing an experiment in the classroom. They
    9·1 answer
  • A car is moving at 20 m/s. The driver steps on the gas pedal and accelerates the car for 4 seconds at an acceleration of 4 m/s2.
    10·1 answer
  • What are ferrous and non ferrous metals<br> ​
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!