While traveling along a highway a driver slows from 24 m/sec to 15 m/sec in 12 seconds. What is the automobile’s acceleration?

Answers

Answer 1

Answer: 24-15=9 m/s slower in 12 seconds. So 9/12 m/s² slower. Therefore the acceleration is -0,75 m/s²

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A negatively - charged object has an excess of ?

Answers

The object has an exes amount of electrons

Which ionic compound is used as a building material?

Answers

Magnesium oxide is an ionic compound that can be used as a building material. MO2 is actually a raw material that used in producing cement for building houses, buildings, and other constructions.
Many old structures were made of limestones. Limestone is from Calcium Carbonate (CaCO3) which is an ionic compound and can be used as a building material too.

Final answer:

Ionic solids, such as sodium chloride and nickel oxide, are used as building materials due to their strong bond and high melting points. They are rigid and brittle but can conduct electricity when molten or dissolved.

Explanation:

Ionic solids, such as sodium chloride and nickel oxide, are used as building materials. These solids are composed of positive and negative ions held together by electrostatic attraction. They have high melting points, are rigid and brittle, and do not conduct electricity in their solid state.

However, they conduct electricity when molten or dissolved. Many simple compounds formed by the reaction of a metallic element with a nonmetallic element are ionic. These are crystalline compounds composed of positively charged ions and negatively charged ions held together by electrostatic forces. They have high melting points and are typically brittle.

Learn more about Ionic solids here:

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the process in which mining companies restore land to its original Contours and replant vegetation is called

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Mining reclamation is the process in which mining companies restore land to its original contours and returns it back to its natural environmental structure that enables the rest of plants and some other vegetation to grow and reproduce. This helps in minimizing effects caused by mining in the environment.

Find the sum. Express the answer in scientific notation. (1.54 x 10^6)+(6.15 x 10^6)

Answers

Answer:

${ \tt{(1.54 * {10}^(6)) + (6.15 * {10}^(6)) }} \n = { \tt{(1.54 + 6.15) * {10}^(6) }} \n = { \tt{7.69 * {10}^(6) }}$

Which device is using a motor?A water heater creates heat energy from electric energy.

A waterfall rotates a waterwheel to turn an axle.

A body massager uses electric energy to move back and forth.

A solar charger creates electric energy from the Sun.

Answers

Out of all the options, only body massager which uses electric energy to move back and forth is using motor here. It is because a motor converts electrical energy to Mechanical energy and only massager obeys it among all the options.

In short, Your Answer would be Option C

Hope this helps!

Answer: C.

A body massager uses electric energy to move back and forth.

Explanation:

Why does hot air rise?

Answers

It rises because hot air is less dense than cool air.

Difference in the densities.

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