PHYSICS HIGH SCHOOL

Which of the following is a characteristic of elements A. They are always metals
B. They cannot be divided into simpler substances
C. They break down when reacting with acids
D. They can be altered with and electric current

Answers

Answer 1
Answer:

Answer:

B

Explanation:

They are the BASE elements. Cannot make them any simpler.

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A pendulum has 576 J of potential energy at the highest point of its swing. How much kinetic energy will it have at the bottom of its swing?

Answers

Ideally, 576 J  because energy is conserved.
In the real world, a tiny tiny tiny tiny bit less than 576 J ,
because we live in a world with friction and air resistance.

Electrostatic forces hold which of the following together?Cu atoms and localized electrons in copper

K+ and Br in KBr

He atoms in helium gas

oxygen and hydrogen atoms in OH

Answers

The best and most correct answer among the choices provided by your question is the first choice.

Electrostatic forces hold Cu atoms and localized electrons in copper together.

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What does a reference point provide

Answers

to check progress and direction

Within an internal combustion engine, the can-shaped component that moves up and down the cylinder and is the main moving part in the engine is the A. connecting rod.
B. crankshaft.
C. piston.
D. spark plug.

Answers

Answer;

C. piston.

Explanation;

  • A piston is a cylindrical component of the engine that slides back and forth in the cylinder bore by forces produced during the combustion process. It is the can shaped engine component that moves up and down the cylinder and  is the main moving part of an engine.
  • It acts as a movable end of the combustion chamber. Pistons are made of cast aluminium alloy to allow excellent and light weight thermal conductivity. They consists of a piston head, piston pin bore, piston pin, skirt piston rings, ring grooves and ring lands.
The crankshaft turns that moves the connecting rod up and down and the piston is inside the cylinder up and down movement.Answer piston

Sound travels fastest in _____.

Answers

Answer:

Sound travels fastest in solids

Explanation:

Sound is a type of mechanical waves. Mechanical waves are produced by the oscillations of the particles in the medium the wave is travelling through.

The speed of a mechanical wave depends on the density of the medium: the higher the density, the higher the speed. This is because in a medium with higher density, atoms/molecules are closer together, so they collide more frequently and therefore the wave can be transmitted faster and more efficiently.

Since solids have higher density than liquids and gases, this also means that mechanical waves (so, sound as well) travel faster in solids than liquids or gases.
Sound travels  fastest in solids,than liquids, and  faster in liquids, than in gases.

An arrow is shot vertically upward from the top edge of a 300 m cliff with a speed of 50 m/s, and it just misses the edge on the way down. What is its speed when it hits the base of the cliff? [91.5 m/s]

Answers