PHYSICS MIDDLE SCHOOL

There are three different types of electrochemical cells.

True or False​
There are three different types of electrochemical cells. True or - 1

Answers

Answer 1
Answer:

Answer:

The answer to this question is False
Answer 2
Answer:

Answer:

false

Explanation:

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What are the 3 ways that magma can form

Answers

Heat Transfer , Decompression Melting or Flux Melting
The three ways that magma can be formed are through heat transfer, decompression melting and flux melting.

How are electromagnets made and how do they work?

Answers

Electromagnets

When an electric current flows in a wire, it creates a magnetic field around the wire. This effect can be used to make an electromagnet. A simple electromagnet comprises a length of wire turned into a coil and connected to a battery or power supply.

How do liquid water, ice, and water vapor differ from each other?

Answers

They are made of different states of matter.
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Why do you lose balance while standing on a bus often. Need a expert to answer this. Must choose if 1st 2nd or 3rd Newton Law. And explain Please help.

Answers

Answer:

The loss of balance while standing on a bus often is due:

  • The third Newton law.

Explanation:

The third Newton law from Latin says: "Action is always opposed an equal reaction: or the two bodies on each other are always equal, and in opposite directions," which means that when a force is exercised in a direction by a body, the other body in the interaction exercises a force in the other direction. In the case of the person on the bus, when the bus makes a force forward, your body makes a force in the other direction (back), in a similar case, when the bus stops, its force in directed to the back, in that time your body make a force forward, in each case your body can lose balance because your center of gravity is directed in the same direction in which the opposite force to that of the bus moves.

A pole-vaulter is nearly motionless as he clears the bar, set 4.2 m above the ground. He then falls onto a thick pad. The top of the pad is 80 cm above the ground, and it compresses by 50 cm as he comes to rest. What is the magnitude of his acceleration as he comes to rest on the pad

Answers

initial height of the pole vaulter = 4.2 m

height of the pole vaulter just before it touch the pad = 80 cm

so the total displacement of pole vaulter just before he will touch the pad = 4.2 - 0.80 = 3.4 m

now by kinematics

v_f^2 - v_i^2 = 2a d

v_f^2 - 0^2 - 2* 9.8*3.4

v_f^2 = 66.64

v_f = 8.16 m/s

now after this he will come to rest after compressing the pad by 50 cm

so again we can use kinematics to find its acceleration

v_f^2 - v_i^2 = 2 a d

0 - 8.16^2 = 2*a*0.50

a = -66.64 m/s^2

so here its acceleration will be - 66.64 m/s^2

Whats the deffinition for energy

Answers

the strength and vitality required for sustained physical or mental activity. It's a noun and not to be rude but isn't there such thing as online dictionary, and... A dictionary
Energy is a property of objects, transferable among them by interactions, which can be converted into different forms but not created or destroyed.
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