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Neko [114]
3 years ago
8

Someone please help me with this question

Physics
1 answer:
Elza [17]3 years ago
4 0
I dont know all of them#13 silicate
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A merry-go-round on a playground consists of a horizontal solid disk with a weight of 805 N and a radius of 1.58 m. A child appl
lozanna [386]

Answer:

The value is KE = 259.6 \  J

Explanation:

From the question we are told that

     The weight of the horizontal solid disk is  W = 805 \  N

      The radius of the horizontal solid disk is  r =  1.58 \  m

      The force applied by the child is  F  =  49.5 \  N

       The time considered is  t =  2.95 \  s

Generally the mass of the  horizontal solid disk is mathematically represented as

          m_h  =  \frac{W}{ g}

=>       m_h  =  \frac{805}{ 9.8 }

=>       m_h  =  82.14 \  N

Generally the moment of inertia  of the horizontal solid disk is mathematically represented as  

         I  =  \frac{1}{2} *  m *  r^ 2

=>      I  =  \frac{1}{2} *  82.14 *   1.58^ 2  

=>      I  =  102.5 \  kg \cdot m^2

Generally the net torque experienced by the horizontal solid disk is mathematically represented as

           T =  I  *  \alpha   =  F *  r

=>         \alpha  =  \frac{ F  *  r }{ I }

=>         \alpha  =  \frac{  49.5  *   1.58 }{  102.53 }

=>         \alpha  = 0.7628

Gnerally from kinematic equation we have that

         w =  w_o  +  \alpha t

Here  w_o is the initial angular velocity velocity of the horizontal solid disk  which is  w_o  =  0\   rad/s

So

           w =   0  +  0.7628 * 2.95

=>        w =  2.2503 \  rad/s

Generally the kinetic energy is mathematically represented as

        KE =  \frac{1}{2}  *  I  *  w^2

=>      KE =  \frac{1}{2}  * 102.53  *  2.2503 ^2

=>      KE = 259.6 \  J

8 0
2 years ago
A 5kg box slides across the floor with an initial velocity of 5m/s. If the coefficient of kinetic friction between the box and t
4vir4ik [10]

The net force on the block perpendicular to the floor is

∑ F[perp] = F[normal] - mg = 0

so that

F[normal] = (5 kg) g = 49 N

Then

F[friction] = 0.1 F[normal] = 4.9 N

so that the net force parallel to the floor is

∑ F[para] = -4.9 N = (5 kg) a

Solve for the acceleration a :

a = (-4.9 N) / (5 kg) = -0.98 m/s²

Starting with an initial velocity of 5 m/s, the box comes to a stop after time t such that

0 = 5 m/s - (0.98 m/s²) t

⇒   t ≈ 5.1 s

5 0
2 years ago
MIDDLE SCHOOL SCIENCE- <br> Please help, I will give brainliest to best answer.
tatyana61 [14]

Answer:

1.) Waves carry energy through empty space or through a medium without transporting matter. While all waves can transmit energy through a medium, certain waves can also transmit energy through empty space. ... When waves travel through a medium, the particles of the medium are not carried along with the wave.

2.) Mechanical Waves are waves which propagate through a material medium (solid, liquid, or gas) at a wave speed which depends on the elastic and inertial properties of that medium. There are two basic types of wave motion for mechanical waves: longitudinal waves and transverse waves. Longitudinal waves vibrating in the direction of propagation while Transverse waves vibrate at right angles to the direction of its propagation.

3.) They can carry a little energy or a lot of energy. They can be transverse or longitudinal. However, all waves have common properties—amplitude, wavelength, frequency, and speed. Amplitude describes how far the medium in a wave moves.

I hope this helps!

5 0
2 years ago
A 360-nm thick oil film floats on the surface of a pool of water. the indices of refraction of the oil and the water are 1.5 and
jenyasd209 [6]
The correct answer is 432, and 720.
The thickness of a film is t= 360nm
the refractive index of oil n₀t = (m +1/2) λ
For m =0
λ = 4n₀t
= 4(1.50)(360)
= 2160nm
for m = 1
λ = 4n₀t
= 4(1.50)(360)/3
= 720nm
m = 2
λ = 4n₀t/5 = 4(1.50)(360)/5
= 432nm
The wavelength which are most strongly reflected are
432nm, 720nm.
7 0
3 years ago
What is this process called when a liquid turns into gas
aev [14]

Answer:

evaporation

Explanation:

3 0
3 years ago
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