PHYSICS HIGH SCHOOL

Which of the following is not accurate when describing solids? A. Solids are better conductors of heat than liquids B. The amount of pressure exerted by a solid is solely dependent on its mass. C. Solids with many air pockets are good insulators. D. Molecules in solids are closer together than molecules in liquids.

Answers

Answer 1
Answer:

Answer;

B. The amount of pressure exerted by a solid is solely dependent on its mass.

Explanation;

  • Pressure is the force per unit area exerted by a substance on a surface.
  • Solids exerts pressure on surfaces, which does not depend on the mass of the solid, but depends on the area of contact on the solid and the force applied.
  • Since pressure refers to force exerted per unit area. Pressure can be increased by either increasing the size of the force or reducing the area over which the force acts.
  • A solid with a larger surface area where the force acts will exert less pressure compared to a solid surface with a small area where the force acts.
Answer 2
Answer: B. The amount of pressure exerted by a solid is solely dependent on its mass
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An ideal gas is enclosed in a piston-cylinder apparatus with the piston being freely movable. Given that LaTeX: \DeltaΔE is positive and LaTeX: \DeltaΔH is negative following a process, ____ the system absorbs heat and expands during the process. the system absorbs heat and contracts during the process. the system loses heat and expands during the process. the system loses heat and contracts during the process. the system loses heat but neither expands nor contracts during the process.

Answers

Clear question is;

An ideal gas is enclosed in a piston-cylinder apparatus with the piston being freely movable. Given that ΔE is positive and ΔH is negative following a process,

pick one

A) the system absorbs heat and expands during the process.

B) the system absorbs heat and contracts during the process.

C) the system loses heat and expands during the process.

D) the system loses heat and contracts during the process.

E) the system loses heat but neither expands nor contracts during the process.

Answer:

Option A is correct.

Explanation:

In thermodynamics, when the change in energy which is ΔE of a system is positive, it means that the system is undergoing an endothermic process. An endothermic process is simply one where heat is absorbed from the surroundings

Now, when change in enthalpy which is ΔH is negative, it means that it's an exothermic reaction. Exothermic means it releases heat to the surroundings. This means work is positive because the system does work on the surroundings. Thus it will expand.

So the correct answer is;

heat is absorbed from the surroundings and will expand during the process.

Which best describes how geothermal energy is used to make electricity? A.
Rocks are split to release energy that drives a steam turbine attached to an electrical generator.
B.
Heat energy from below the ground converts water to steam to drive a steam turbine attached to an electrical generator.
C.
Heat energy from below the ground drives liquid water though a turbine attached to an electrical generator.
D.
Heat energy from below ground heats and pressurizes air that drives a turbine attached to an electrical generator.

Answers

Heat energy from below the ground converts water to steam to drive a steam turbine attached to an electrical generator

Suppose that you find the volume of all the oceans to be 1.4×109km3 in a reference book. To find the mass, you can use the density of water, also found in this reference book, but first you must convert the volume to cubic meters. What is this volume in cubic meters?

Answers

152.600.000
1 km3 = 1000.000m3

As you move toward a warning siren, the pitch _____.increases
decreases
stays the same
disappears

Answers

Answer: Increases.

Explanation:

Warning siren is generally used to make people alert of danger. Danger can be anything associated with the health and hazard.

Warning siren can be due to tsunami, earthquake, fire, flood, et cetera. The pitch of siren is low when a person is afar from the siren.

As the person moves close to the siren, the pitch of siren increases.

Answer:

As you move toward the siren the pitch should get louder

Explanation:

What type of bond is formed if atoms donate electrons to other atoms when the elements are combined?

Answers

Ionic bond.

In the ionic bond one atom loses one or more electrons, leaving the atom with positive charge, and the other atom accepts those electrons standing with negative charge.

What type of magnetism is present in a magnet that you use to place a photograph on the refrigerator? A. Induced
B. Superconducting
C. Contact
D. Permanent

Answers

Answer:

C) Contact

Explanation:

The magnet requires almost direct contact with the fridge to start its magnetic properties.

Answer:

Correct Answer is option D (permanent)

Explanation:

Permanent magnet

Permanent magnet is a magnet in which magnetic properties are present even in the absence of an external magnetic field. It has its own magnetic field.

Permanent type of magnetism is present in a magnet that we use to place a photograph on the refrigerator.This permanent magnet  is made up of powdered ferrite  and liquid plastic. The  mixture of ferrite and plastic is heated at a particular temperature and then this heated mixture is placed in a strong magnetic field. Due to this applied magnetic field this mixture is turned into a permanent magnet.

By this method of it requires less material to create a permanent magnet.

I hope this answer will help you.
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