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Stells [14]
3 years ago
12

A wheel is rotating freely at angular speed 530 rev/min on a shaft whose rotational inertia is negligible. A second wheel, initi

ally at rest and with 9 times the rotational inertia of the first, is suddenly coupled to the same shaft. (a) What is the angular speed of the resultant combination of the shaft and two wheels
Physics
1 answer:
Grace [21]3 years ago
5 0

Answer: 53\ rev/min

Explanation:

Given

angular speed of wheel is \omega_1 =530\ rev/min

Another wheel of 9 times the rotational inertia is coupled with initial wheel

Suppose the initial wheel has moment of inertia as I

Coupled disc has 9I as rotational inertia

Conserving angular momentum,

\Rightarrow I\omega_1=(I+9I)\omega_2\\\\\Rightarrow \omega_2=\dfrac{I}{10I}\times 530\\\\\Rightarrow \omega_2=53\ rev/min

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The medulla in the brain controls the breathing rate in the lungs
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3 years ago
a person jogs eight complete laps around a 400-m track in a total time of 15.1 min .calculate the average speed, in m/s .
valentinak56 [21]

The average speed in m/s of a person that jogs eight complete laps around a 400m track in a total time of 15.1 min is 0.44m/s.

<h3>How to calculate average speed?</h3>

Average speed of a moving body can be calculated by dividing the distance moved by the time taken.

Average speed = Distance ÷ time

According to this question, a person jogs eight complete laps around a 400m track in a total time of 15.1 min. The average speed is calculated as follows:

15.1 minutes in seconds is as follows = 906 seconds

Average speed = 400m ÷ 906s

Average speed = 0.44m/s

Therefore, the average speed in m/s of a person that jogs eight complete laps around a 400m track in a total time of 15.1 min is 0.44m/s.

Learn more about average speed at: brainly.com/question/12322912

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6 0
1 year ago
Which is a characteristic of all ions?
zzz [600]

Answer:>

Explanation:

All ionic compounds have high melting and boiling points

6 0
3 years ago
Read 2 more answers
The kinetic energy of the ball and the potential energy of the ball/Earth system were measured and organized in the spreadsheet
marin [14]

Based on the data provided, the thermal energies at the given time intervals are as follows:

  • At time t = 0.0 secs; thermal energy = 0.0 J
  • At time, t = 0.8 secs; thermal energy = 0.0 J
  • At time, t = 2.0 secs; thermal energy = 3.9 J
  • At time, t = 2.8 secs; thermal energy = 6.7 J

<h3>What is the law of conservation of energy?</h3>

The law of conservation of energy states that the total energy in an isolated system is conserved.

For a ball undergoing energy conversion between kinetic and potential energy, the sum of the energy remains constant.

Any reduction in total energy is due to conversion of some energy to thermal energy.

  • Sum of energy: Kinetic + potential + thermal = 15.2 J
  • Thermal energy = 15.2 - (PE + KE)

At time t = 0.0 secs

Thermal energy = 15.2 - (15.2 + 0.0)

Thermal energy = 0.0 J

At time, t = 0.8 secs

Thermal energy = 15.2 - (4.7 + 10.5)

Thermal energy = 0.0 J

At time, t = 2.0 secs

Thermal energy = 15.2 - (7.4 + 3.9)

Thermal energy = 3.9 J

At time, t = 2.8 secs

Thermal energy = 15.2 - (8.5 + 0.0)

Thermal energy = 6.7 J

Therefore, the thermal energies at the given time intervals are as follows:

  • At time t = 0.0 secs; thermal energy = 0.0 J
  • At time, t = 0.8 secs; thermal energy = 0.0 J
  • At time, t = 2.0 secs; thermal energy = 3.9 J
  • At time, t = 2.8 secs; thermal energy = 6.7 J

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8 0
2 years ago
The strength of the Earth’s magnetic field B at the equator is approximately equal to 5 × 10−5 T. The force on a charge q moving
Blizzard [7]

Answer:

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Explanation:

Since the Earth's magnetic field is perpendicular to your direction of motion, the strength of the magnetic force exerted on your head is given by:

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where:

q=6\cdot 10^{-9}C is the charge on your head

v=80 m/s is the speed at which you are moving

B=5\cdot 10^{-5} T is the strength of the magnetic field of the Earth

By substituting these numbers into the equation, we find the strength of the magnetic force:

F=(6\cdot 10^{-9}C)(80 m/s)(5\cdot 10^{-5} T)=2.4\cdot 10^{-11} N

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3 years ago
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