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3 years ago

Like-charged bodies, when brought closer together, will

1 answer:

4 0

Like-charged bodies will repel each other. When they're brought
closer together, they'll repel each other with even more force.

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If a dog is accelerating at a constant rate of 6.57 m/s2, what is the mass of the dog if 25 N of force is being applied to it?

Oliga [24]

Answer:

<h3>The answer is 3.81 kg</h3>

Explanation:

The mass of the dog can be found by using the formula

$m = \frac{f}{a} \\$

f is the force

a is the acceleration

From the question we have

$m = \frac{25}{6.57} \\ = 3.80517503$

We have the final answer as

Hope this helps you

8 0

3 years ago

Calculate the average speed (in km/h) of a car stuck in traffic that drives 12 kilometers in 2 hours.

Vilka [71]

This is a trick question, isn't it? If a car is stuck in traffic, it doesn't matter how fast it can travel, because it isn't moving at all. Therefore the average speed would be zero, right?

7 0

4 years ago

A 73-kg person in a moving car stops during a car collision in a distance of 0.80 m . The stopping force that the air bag exerts

fredd [130]

Answer:

v₀ = 13.24 m / s

Explanation:

Let's use Newton's second law to find the average acceleration during the crash

F = m a

. a = F / m

a = 8000/73

a = 109.59 m / s²

Now we can use the kinematic equations to find the initial velocity, since when the velocity stops it is zero (v = 0)

v² = v₀² - 2 a x

v₀² = 2 a x

v₀ = √ 2 a x

v₀ = √ (2 109.59 0.80)

v₀ = 13.24 m / s

3 0

4 years ago

Read 2 more answers

The shortest pipe in a particular organ is 1.23 m.

AVprozaik [17]

Answer:

The 9th harmonic is 1,010.67 Hz.

Explanation:

Given;

length of the pipe, L = 1.23 m

speed of sound at 0°C = 331.5 m/s

A pipe closed at one end is known as a closed pipe;

The wavelength of the sound for the first harmonic is calculated as;

L = Node ------ > Antinode

$L = \frac{\lambda }{4} \\\\\lambda = 4L$

First harmonic: $F_0 = \frac{V}{\lambda} = \frac{V}{4L}$

The wavelength of the sound for the first harmonic is calculated;

L = Node ----> Node + Node ------> Antinode

$L = \frac{\lambda}{2} + \frac{\lambda}{4} = \frac{2\lambda+\lambda}{4} = \frac{3\lambda}{4} \\\\\lambda = \frac{4 L}{3}$

Second harmonic: $F_1 = \frac{V}{\lambda} = \frac{3V}{4L}$

F₁ = 3F₀

The increment from F₀ to F₁ is 1 to 3; (odd number).

(1, 3, 5, 7, 9, 11, 13, 15, 17, 19..... n+2, where n is odd number)

The 9th harmonic = F₈

F₈ = 15F₀

$F_8= 17(F_0) = 15 (\frac{V}{4L} )\\\\F_8 = 15(\frac{331.5}{4\times 1.23} )\\\\F_8 = 1,010.67 \ Hz$

Therefore, the 9th harmonic is 1,010.67 Hz.

8 0

3 years ago

The waves in the electromagnetic spectrum have a speed that A. Increases in proportion to the frequency of the wave B. Increase

victus00 [196]

Answer:

B. Increase in proportion to the wavelength of a wave.

Explanation:

An electromagnetic spectrum refers to a range of frequency and wavelength that an electromagnetic wave is distributed or extends. The electromagnetic spectrum comprises of gamma rays, visible light, ultraviolet radiation, x-rays, radio waves, and infrared radiation.

Electromagnetic waves is a propagating medium used in all communications device to transmit data (messages) from the device of the sender to the device of the receiver.

Generally, the most commonly used electromagnetic wave technology in telecommunications is radio waves.

Radio waves can be defined as an electromagnetic wave that has its frequency ranging from 30 GHz to 300 GHz and its wavelength between 1mm and 3000m. Therefore, radio waves are a series of repetitive valleys and peaks that are typically characterized of having the longest wavelength in the electromagnetic spectrum.

Wavelength is simply the distance from one peak of an electromagnetic wave to the next peak. This distance is also equal to the distance from one trough of a wave to another.

Mathematically, wavelength is calculated using this formula;

$Wavelength = \frac {speed}{frequency}$

Hence, the waves in the electromagnetic spectrum have a speed that increase in proportion to the wavelength of a wave.

8 0

3 years ago