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JulijaS [17]
3 years ago
10

A child standing on the edge of a freely spinning merry-go-round moves quickly to the center. Which one of the following stateme

nts is necessarily true concerning this event and why?
a. the angular speed of the system increases because the moment of inertia of the system has decreased.
b. the angular speed of the system increases because the moment of inertia of the system has increased.
c. The angular speed of the system decreases because the moment of inertia of the system has increased.
d. The angular speed of the system remains the same because the net torque on the merry-go-round is zero N x m.
e. The angular speed of the system decreases because the moment of inertia of the system has decreased.
Physics
1 answer:
Komok [63]3 years ago
3 0

Answer:

D

Explanation:

Why is because the merry go round wont do anything cause he will stay the same speed.

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a = g = 9.81[m/s^2]

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m*g = m*a

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a = acceleration [m/s^2]

Note: If the skydiver will be under air resistance forces his acceleration will be different.

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7 0
3 years ago
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When the temperature of the air is 50°C, the velocity of a sound wave traveling through the air is approximately?
noname [10]

The answer is:

C. 361 m/s

The explanation:

To calculate  the speed of sound at a given temperature (50°C) we are going to use this formula:

v = 331 + 0.6T

when V is the velocity

and T is the temperature = 50°C

by substitution:

v = 331 + 0.6(50)

v = 361 m/s

So, The correct answer is C.

because of the variation of the motion of the molecules of air with change of temperature so, the velocity (V) of the  sound in the air is change with temperature.

5 0
3 years ago
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what evidence can you cite that the interstellar medium contains both gas and dust? (select all that apply.)
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(a) The gas of interstellar medium can be detected from the radiations of photons of  wavelength 21 cm.

(b) The gas of interstellar medium can be detected from the absorption lines present in the light from distant stars, which must be caused by a medium of density and temperature other than that of the stars emitting the lights.

<h3>What is interstellar medium?</h3>

Interstellar medium is the matter and radiation that exist in the space between the star systems in a galaxy.

<h3>Evidence that interstellar medium contains both gas and dust</h3>
  • The gas of interstellar medium can be detected from the radiations of photons of  wavelength 21 cm.
  • The gas of interstellar medium can be detected from the absorption lines present in the light from distant stars, which must be caused by a medium of density and temperature other than that of the stars emitting the lights.

Learn more about  interstellar medium here: brainly.com/question/4173326

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