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3 years ago

Add these measurements, using significant digit rules: 1.0090 cm + 0.02 cm = cm

Physics

1 answer:

marin [14]3 years ago

7 0

Answer:

1.029

Explanation:

1.0090 can also be looked at as "1.009"

0.02 can also be looked at as "0.020"

I think of it as 20+9 which is 29. There for your answer should be 1.029. There are no measurement rules applying to this equation since they are both in centimeters. So you don't have to convert anything.

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3. The following sound waves have what velocity? (convert cm into m in your calculations.)

mestny [16]

The sound waves with the frequency 20 Hz, 200 Hz, 2,000 Hz, and 20,000 Hz have a velocity of 344 m/s.

<h3>What are sound waves?</h3>

A sound wave is a sample resulting from the motion of strength traveling thru a medium (inclusive of air, water, or every other liquid or stable matter) because it propagates from the supply of the sound. Sound waves are created and convey strain waves, for example, a cellphone.

The frequency can be given as:

Frequency = Velocity/ Wavelength

Velocity = Frequency * Wavelength

The velocity of the following sound waves is given as:

Frequency = 20 Hz

Wavelength = 17.2 m

Velocity = 20 * 17.2 m/s

Velocity = 344 m/s

Frequency = 200 Hz

Wavelength = 1.72 m

Velocity = 200 * 1.72 m

Velocity = 344 m/s

Frequency = 2,000 Hz

Wavelength = 17.2 cm = 0.172 m

Velocity = 2,000 * 0.172 m/s

Velocity = 344 m/s

Frequency = 20,000 Hz

Wavelength = 1.72 cm = 0.0172 m

Velocity = 20,000 * 0.0172 m/s

Velocity = 344 m/s

Read more about the sound waves:

brainly.com/question/13105733

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6 0

2 years ago

Marca las siguientes afirmaciones con V o F (verdadero o falso) y luego justifica aquellas que consideras falsas:

Harlamova29_29 [7]

Answer:

answer is

Explanation:

I need points

6 0

3 years ago

PLEASE HELP AND HURRY

julsineya [31]

It would be D. Equal to zero

3 0

3 years ago

A uniform, solid cylinder of radius 5.00 cm and mass 3.00 kg starts from rest at the top of an inclined plane that is 2.00 m lon

ch4aika [34]

To solve this problem we will apply the principle of conservation of energy, for which the initial potential and kinetic energy must be equal to the final one. The final kinetic energy will be transformed into rotational and translational energy, so the mathematical expression that approximates this deduction is

KE_i+PE_i = KE_{trans}+KE_{rot} +PE_f

$KE_i = 0$ , since initially cylinder was at rest

$PE_f = 0$ since at the ground potential energy is zero

The mathematical values are,

$mgh = \frac{1}{2} mV^2 + \frac{1}{2}I\omega^2$

Here,

m = mass

g= Gravity

h = Height

V = Velocity

$I = \frac{mr^2}{2}$ moment of Inertia in terms of its mass and radius

$\omega = \frac{V}{r}$ Angular velocity in terms of tangential velocity and its radius

Replacing the values we have that

mgh = \frac{1}{2} mv^2 +\frac{1}{2} (\frac{mr^2}{2})(\frac{v}{r})^2

gh = \frac{v^2}{2}+\frac{v^2}{4}

v = \sqrt{\frac{4gh}{3}}

From trigonometry the vertical height of inclined plane is the length of this plane for $sin\theta$ , then

$h = 2.00*sin 25$

$h = 0.845 m$

Replacing,

$v = \sqrt{\frac{4(9.8)(0.845)}{3}}$

$V = 3.32 m/s$

Therefore the cylinder's speedat the bottom of the ramp is 3.32m/s

6 0

3 years ago

Semiconductors can simplistically be thought of as an intermediate state between insulators and conductors. In a semiconductor,

Triss [41]

Answer:

The semiconductor rod will conduct electricity

Explanation:

Glass rod does not conduct electricity. Glass is one of the best insulators of electricity. But when a glass rod is replace with a semi conductor, then the semi conductor rod starts conducting electricity as the electrons are free to move.

Semi conductors are special materials in which the energy band lies in between the conductor and the non conductor. The conductivity of a semi conductor increases with the increasing temperature.

In an semi conductor the electrons are free to move and as they starts moving they conduct electricity. Thus a semi conductor rod replacing a glass rod conducts electricity.

6 0

3 years ago