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3 years ago

Which statement describes a difference between insulators and conductors?(1 point)

Physics

1 answer:

GrogVix [38]3 years ago

3 0

Answer:

The "Insulators have high resistance, while conducters have low resistance".

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A person of mass 80 kg stands at the center of a rotating merry-go-round platform of radius 3.5 m and moment of inertia 950 kg*m

Leya [2.2K]

Answer with Explanation:

We are given that

Mass of person,M=80 kg

Radius,r=3.5 m

Moment of inertia of merry,I= $950 kgm^2$

Angular velocity of platform= $\omega=0.85rad/s$

1.Law of conservation of angular momentum

$I\omega=I'\omega'$

Where $I'=950+80(3.5)^2$

Substitute the values

$950\times 0.85=(950+80(3.5)^2)\omega'$

$\omega'=\frac{950\times 0.85}{950+80(3.5)^2}=0.418rad/s$

Angular velocity when the person reaches the edge =0.418 rad/s

2.Rotational kinetic energy of the system before the person's walk

$K_i=\frac{1}{2}I\omega^2=\frac{1}{2}(950)(0.85)^2=343.2 J$

3.Rotational kinetic energy of the system after the person's walk

$K_f=\frac{1}{2}(950+80(3.5)^2)\times (0.418)^2$

$K_f=168.6 J$

3 0

3 years ago

3. A very brittle piece of iron metal (C=.44 J/gC) is heated to 200 C and placed

lubasha [3.4K]

Answer:The temperature of a piece of Metal X with a mass m of 95.4g increases from 25.0°C to 48.0°C as the metal absorbs 849 J of heat.

Explanation:

4 0

2 years ago

A 0.676 m long section of cable carrying current to a car starter motor makes an angle of 57.7º with the Earth’s 5.29 x 10^−5T f

Studentka2010 [4]

Answer:

The current in the wire under the influence of the force is 216.033 A

Solution:

According to the question:

Length of the wire, l = 0.676 m

$\theta = 57.7^{\circ}$

Magnetic field of the Earth, $B_{E} = 5.29\times 10^{- 5} T$

Forces experienced by the wire, $F_{m} = 6.53\times 10^{-3} N$

Also, we know that the force in a magnetic field is given by:

$F_{m} = IB_{E}lsin\theta$

$I = \frac{F_{m}}{B_{E}lsin\theta}$

$I = \frac{6.53\times 10^{-3}}{5.29\times 10^{- 5}\times 0.676sin57.7^{\circ}$

I = 216.033 A

5 0

3 years ago

What is the correct definition of civics?

RSB [31]

Answer:

the definition of civics is the study of the rights and duties of citizenship.

so the answer is B.

hope this helps.

4 0

3 years ago

Read 2 more answers

Which property of sound waves decreases as the square of the distance from the source increases?

Vitek1552 [10]

Answer:

Intensity

Explanation:

The intensity of a sound wave is equal to the ratio between to the power emitted by the source divided by the area of the spherical surface through which the wave propagates:

$I=\frac{P}{4\pi r^2}$

where

P is the power

$4\pi r^2$ is the area of the spherical surface

r is the distance from the source

As we see from the formula, the intensity is inversely proportional to the square of the distance from the source:

$I\propto \frac{1}{r^2}$

so, intensity is the correct answer.

3 0

3 years ago