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
Serggg [28]
3 years ago
10

A playground merry-go-round has a radius of 4.6 m and a moment of inertia of 200 kg-m2 and turns with negligible friction about

a vertical axle through its center. A child applies a 26.0 N force tangentially to the edge of the merry-go-round for 15.0 seconds. If the merry-go-round is initially at rest, how much work did the child do on the merry-go-round?
Physics
1 answer:
tankabanditka [31]3 years ago
6 0

Answer:

8050 J

Explanation:

Given:

r = 4.6 m

I = 200 kg m²

F = 26.0 N

t = 15.0 s

First, find the angular acceleration.

∑τ = Iα

Fr = Iα

α = Fr / I

α = (26.0 N) (4.6 m) / (200 kg m²)

α = 0.598 rad/s²

Now you can find the final angular velocity, then use that to find the rotational energy:

ω = αt

ω = (0.598 rad/s²) (15.0 s)

ω = 8.97 rad/s

W = ½ I ω²

W = ½ (200 kg m²) (8.97 rad/s)²

W = 8050 J

Or you can find the angular displacement and find the work done that way:

θ = θ₀ + ω₀ t + ½ αt²

θ = ½ (0.598 rad/s²) (15.0 s)²

θ = 67.3 rad

W = τθ

W = Frθ

W = (26.0 N) (4.6 m) (67.3 rad)

W = 8050 J

You might be interested in
In the Balmer series, how many spectral lines have the wavelength greater than 400 nm?
Irina18 [472]

<span>The Balmer series or Balmer lines in atomic physics, is the designation of one of a set of six named series describing the spectral line emissions of the hydrogen atom. The Balmer series is calculated using the Balmer formula, an empirical equation discovered by Johann Balmer in 1885. this is all I know sorry</span>
4 0
3 years ago
The diagram below shows the relative positions of Earth and the Sun at a certain time of the year. Based on the diagram, which s
AlladinOne [14]

Answer:

summer

Explanation:

Notice the higher density of the rays of the sun hitting straight the latitudes below the equator.

7 0
3 years ago
I'd like you to think back on 2 events in
strojnjashka [21]

Answer:

Holi

biwali

these are best events and love to celebrate withmy family and friends it contains lot of happiness and joy

7 0
3 years ago
A piece of glass has a temperature of 72.0 degrees Celsius. The specific heat capacity of the glass is 840 J/kg/deg C. A liquid
Nezavi [6.7K]

Answer:

741 J/kg°C

Explanation:

Given that

Initial temperature of glass, T(g) = 72° C

Specific heat capacity of glass, c(g) = 840 J/kg°C

Temperature of liquid, T(l)= 40° C

Final temperature, T(2) = 57° C

Specific heat capacity of the liquid, c(l) = ?

Using the relation

Heat gained by the liquid = Heat lost by the glass

m(l).C(l).ΔT(l) = m(g).C(g).ΔT(g)

Since their mass are the same, then

C(l)ΔT(l) = C(g)ΔT(g)

C(l) = C(g)ΔT(g) / ΔT(l)

C(l) = 840 * (72 - 57) / (57 - 40)

C(l) = 12600 / 17

C(l) = 741 J/kg°C

5 0
3 years ago
15 points and brainliest to whoever helps me!
Juliette [100K]

Answer:

The correct answer is false, a plant dying after being exposed to poison is not a physical change nor is it a physical property.

Explanation:

6 0
3 years ago
Other questions:
  • Physics help please
    10·1 answer
  • Certain mushrooms launch their spores by a catapult mechanism. As water condenses from the air onto a spore that is attached to
    15·1 answer
  • Identify at least two ways that runoff can negatively impact an ecosystem.
    8·1 answer
  • There are many types of factors that have an effect on the force of gravity on an elephant. Which factor will LEAST affect the f
    7·2 answers
  • Can someone please here me I’m confused
    9·1 answer
  • Malik formed a hypothesis that an increase in atmospheric oxygen levels by 10% would cause red-legged grasshoppers to grow large
    12·2 answers
  • What three ways are molecules used when they are stored for energy?
    11·1 answer
  • PLZ PLZ PLZ PLZ PLZ PLZ PLZ HELPPPPPPPPPPPPPPPPP
    14·2 answers
  • Four forces are exerted on each of the two objects shown below:
    15·2 answers
  • How much potential energy does an 8 kg flower pot hanging 5 m above the ground have
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!