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
svetoff [14.1K]
2 years ago
5

A disk-shaped space station 125 m in diameter spins at a constant angular velocity. If the acceleration of a point on the rim of

the disk is to be equal to "g", how long does it take for the station to make one revolution?
Physics
1 answer:
dedylja [7]2 years ago
5 0

Answer:

  t = 22.44 s

Explanation:

The acceleration of the station is centripetal which has the formula

         a = v² / r

linear and angular velocity are related

         v = w² r

as they indicate that the acceleration is equal to the acceleration of gravity

         g = w² r

         w = \sqrt{  \frac{g}{r} }

         

let's calculate

         w = \sqrt{ \frac{9.8}{ 125} }

         w = 0.28 rad / s

to calculate the time use us

          w = θ / t

in a complete revolution θ = 2pi

          t = θ / w

let's calculate

          t = 2π / 0, 28

          t = 22.44 s

You might be interested in
5 What is the maximum speed at which a car round a curve of 25m radius on a level road if the coefficient of static friction bet
pshichka [43]

Hi there!

On a level road:

∑F = Ff (Force due to friction)

The net force is the centripetal force, so:

mv²/r = Ff

Rewrite the force due to friction:

mv²/r = μmg

Cancel out the mass:

v²/r = μg

Solve for v:

v = √rμg

v = √(25)(9.81)(0.8) = 14.01 m/s

8 0
2 years ago
The phase change in which a substance changes from a gas directly to a solid is
vlabodo [156]
<span>Condensation is the change of the substance from liquid to solid phase. Example of this is the formation of ice. Vaporization is the change of substance from liquid to gas phase. Example of this is the boiling of water. Deposition is the change of a substance from gas to solid phase. Example of this is the formation of ice on a winter day. Sublimation is the change of a substance from solid to gas phase. Example of this is dry ice. The answer is letter C.</span>
7 0
3 years ago
Read 2 more answers
An upward force of 32.6 N is applied via a string to lift a ball with a mass of 2.8 kg. (a) What is the gravitational force acti
Igoryamba

Answer:

a) Fg = -27.4 N

b) Fnet = 5.2 N

c) a = 1.9 m/s2

Explanation:

a)

  • There are two forces acting on the ball, one directed upward (assuming this direction as positive, along the y-axis) which is the tension on the string (lifting force), and another aimed downward, which is the attractive force due to gravity.
  • Applying the Newton's Universal Law of Gravitation to a mass close to the surface of the Earth (in this case the ball), we can take the acceleration due to gravity like a constant, that we call by convention g, equal to -9.8 m/s2.
  • So, we can write the following expression for Fg:

       F_{g} = m*g = 2.8 kg*(-9.8m/s2) = -27.4 N (1)

b)

  • The net force on the ball, will be just the difference between the lifting force (32.6 N) and the force due to gravity, Fg:

       F_{net} = T -F_{g} = 32.6 N - 27.4 N = 5.2 N  (2)

c)

  • According Newton's 2nd Law, the acceleration caused by a net force on a point mass (we can take the ball as one) is given by the following expression:

       a = \frac{F_{net} }{m} = \frac{5.2N}{2.8kg} = 1.9 m/s2  (3)

3 0
2 years ago
How long did it take our planet to produce the fossil fuels we're using today?
Vesna [10]

Answer:

It takes millions sometimes hundreds of millions Explanation:

3 0
2 years ago
Read 2 more answers
Which property is closely related to its temperature
Lilit [14]

Answer:

Mass – The single most important property that determines other properties of the star. Luminosity – The total amount of energy (light) that a star emits into space. Temperature – surface temperature, closely related to the luminosity and color of the star

Explanation:

8 0
3 years ago
Read 2 more answers
Other questions:
  • Please help only eight questions C:
    12·2 answers
  • Which biome is most likely to have animals that hibernate, or sleep for long periods during the winter to avoid the cold?
    5·2 answers
  • A mans walks 200 meter on 20 seconds. What is the man speed?
    9·2 answers
  • Create a group of 3-4 students. Using your cell phone flashlight and the filter, create a "blue" flashlight, "red" flashlight, a
    14·1 answer
  • Elaborate on the reason that "cola" type drinks are used to make effective marinades.
    13·2 answers
  • two womans are of the same weight. one wears sandals with pointed heels while the other wears sandals with flat sole s. which on
    9·1 answer
  • A concrete block is pulled 7.0 m across a frictionless surface by means of a rope. The tension in the rope is 40 N; and the net
    11·1 answer
  • Which device provides electrical energy to run an electric circuit
    14·1 answer
  • What property of sound does a decibel measure
    13·2 answers
  • A house is advertised as having 1560 square feet under roof. What is the area of this house in square meters?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!