Why do the densities of most substances decrease with an increase in temperature?

Answers

Answer 1

Answer: because density is related to activity of particles, the higher the activity level (the faster they're moving, and distance between them) the less dense they are. for example, H2O in a solid the particles are close together with minimum movement and it exists as ice, but when heat is applied the particles become more active and move more decreasing the density becoming liquid water, then when excessive heat is applied the same occurs and it becomes gas steam

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In the series circuit below the power source is a 9-volt battery and three resistors are R1 = 7 ohm, R2 = 9 ohm and R3 = 2 ohm. What is the total resistance in the series circuit? R1 7 ohm + R2 9 ohm + R3 2 ohm = 18
Is this correct?

Answers

Yes indeed. You're on your way. In a series circuit, the total resistance is the sum of the individuals no matter what order they're in. Now, if the question goes on to ask what is the current in the circuit, that will be the source voltage divided by the total resistance that you have calculated.

Which of the following does a weather station model demonstrate?A) altitude
B) air mass
C) air density
D) temperature

Answers

D
A weather station model depicts many weather elements such as wind speed and direction, cloud type, cloud cover, temperature, dew point and others. However, options A, B, and C are not depicted.

d, temperature

its the right answer on the test !! :D

What are other words for saying that a wave is "transmitted" through a medium?

Answers

Other words for saying that a wave is "transmitted" through a medium are transmission, propagation, spread.

What is a wave ?

"Wave is a phenomenon or disturbance in which energy is transferred from one point to another without any direct contact between them." For example: Heat, light and sound is considered as a wave.

Know more about wave here

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Answer:

Other words for saying that a wave is transmitted through a medium would be a wave transfers from one medium into another.

Explanation:

On a distance vs time graph, what does the line of an object at constant
speed look like?

Answers

Answer: Diagonal going up

Explanation:

A patient with type A blood is accidentally given a transfusion of type AB blood. Which of the following correctly describes what will happen in the patient's body?

Answers

The antibodies in the patient's blood will fight or attack the donor's red blood cells and kill them. This could cause side effects called a hemolytic reaction - wherein the phenomena causes damage to the kidneys, fever, shortness of breath, low blood pressure, and chills.

The blue end of the visible color spectrum has wavelengths, and the red end has wavelengths.

Answers

Answer: Blue end has shorter wavelength and red end has longer wavelengths.

Explanation:

Visible region consists of Violet, Indigo, Blue, Green, Yellow, Orange and Red. These colors are arranged in the order of increasing wavelengths which means that blue region has shorter wavelength and as we move towards red region, the wavelength of light increases.

Blue region has shorter wavelength and higher frequency whereas red region has longer wavelength and smaller frequency.

Frequency and wavelength follow inverse relation.

$\nu\propto (1)/(\lambda)$

Answer: Blue end has shorter wavelength and red end has longer wavelengths.

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