An empty party balloon will float to the ceiling of a room once it is filled with helium.A. What does this tell you about the density of air in the room compared to the density of helium?

B. For the balloon to float in air, what two factors might have changed about the balloon?

Answer those two questions of you know the answer.

Answers

Answer 1

Answer: Helium is a gas composed of itself, were air is composed of Oxygen and Nitrogen making the air more dense than the helium making it float to find other gases

Two factors to change are Air pressure (due to the balloon moving ) and the helium making the balloon rise.

That's about all I can explain...hope this helps >.<

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What happens immediately before a volcano erupts?

Answers

Well, the cause of a volcanic eruption is when the lower crust melts. This leads to the formation of magma. The volcano is an opening through which the magma is discharged. The rock inside the earth melts. This magma is diffused upwards through the volcano. If magma reaches the top of the volcano, it behaviour depends on viscosity. So what happens before a volcanic eruption is that the lower crust melts, causing the formation of magma, which is released through the volcano. Hope i helped.

The Global Positioning System, or GPS, uses a network of satellites that orbit the Earth to calculate and track locations. Which of the following best describes the signals sent and received by satellites?A.
gravitational energy
B.
potential energy
C.
sound waves
D.
electromagnetic waves

Answers

Electromagnetic waves best describes the signals sent and received by satellites. Therefore, the correct option is option D.

What is electromagnetic waves?

In classical physics, electromagnetic radiation refers to the movement of energy through a material medium or across empty space at the speed of light in the form of the magnetic and electrical fields that comprise up electromagnetic waves like electromagnetic radiation, visible light, including gamma rays.

Time-varying magnetic and electric fields are linked to one another at right angles or perpendicular towards the direction that of motion in such a wave. The strength and wavelength v of the time fluctuation of the magnetic and electricity fields define an electromagnetic wave. Electromagnetic waves best describes the signals sent and received by satellites.

Therefore, the correct option is option D.

To know more electromagnetic waves, here:

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Answer:

Explanation:

electromagnet STUDY ISLAND :)

An ice cube is placed in a plastic cup on the lab table. Students record the mass of the ice cube and the plastic cup as 5 grams. One hour later the ice cube completely melts, turning into liquid water. Then, the students record the mass of the water and the cup. What is the mass of the water and plastic cup?

Answers

The answer is still 5 grams because mass can not be changed or destroyed.

Final answer:

The mass of the system consisting of the ice cube and the plastic cup will remain 5 grams even after the ice completely melts. This is because of the Conservation of Mass principle, which states that mass is not lost during a phase change.

Explanation:

The principle operating in this scenario is called the Conservation of Mass. In this specific context, this principle means that the mass of an object or a system of objects will remain the same regardless of the changes it may undergo, as long as no mass enters or leaves the system. In the case of an ice cube melting, although the physical state (phase) of the water changes from solid (ice) to liquid (water), its mass does not change.

So when an ice cube that weighs 5 grams (along with the cup) melts, it turns into an equivalent mass of liquid water. That means even after the ice has completely melted into water, the mass of the water and the plastic cup will still be 5 grams.

This is because during the phase change, only the state of the matter is altered (from solid to liquid), not its mass. The water molecules in the ice rearrange themselves and move apart during melting allowing the ice to become liquid water, but the number of molecules and thus the mass stays the same.

Learn more about Conservation of Mass here:

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Why does gold sink and wood float when they have similar volumes?

Answers

gold is more dense than wood? hope its right!

Answer:gold is more dense than wood wood has like air bubbles in it which makes it float and gold is solid with no bubbles

Explanation:

An investigation that is controlled is what

Answers

when the the different things in an investigation are all in one way the same. Example: my project is to grow flowers in different shades of light I would still give the flowers the same amount of water and they would all be the same temperature. nothing but the diffrence in you project is different

What is the volume of solution (in mL) produced when 91.80g of Mg(OH)2 are usedto produce a 0.7M solution? Record your answer to 1 decimal places.