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Morgarella [4.7K]
3 years ago
6

What did the greeks call the mineral they found and why?

Physics
1 answer:
Elza [17]3 years ago
6 0
Ancient civilizations had a high demand for raw materials, like clay, diverse rocks and, most of all, metals. These were required for buildings, crafts, agriculture, their armed forces, financial concerns, art and culture. Clays and rocks produced by opencast mining primarily served for the production of bricks and building blocks, which were used for civil and hydraulic engineering.
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What happens when you sit in a chair?
stellarik [79]
B Yea that should be the right answer
3 0
3 years ago
If a system absorbs 155.0 kJ of heat from its surroundings and the system does 45.0 kJ of work on its surroundings, what is the
Ede4ka [16]

The change in the internal energy of the system is 110 kJ.

<h3>What is internal energy?</h3>

Internal energy is defined as the energy associated with the random, disorder motions of molecules.

calculate the change in internal energy, we apply the formula below.

Formula:

  • ΔU = Q-W.................... Equation 1

Where:

  • ΔU = Change in internal energy
  • Q = Heat absorbed from the surroundings
  • W = work done by the system

From the question,

Given:

  • Q = 115 kJ
  • W = 45. 0 kJ

Substitute these values into equation 1

  • ΔU = 155-45
  • ΔU = 110 kJ

Hence, The change in the internal energy of the system is 110 kJ.

Learn more about  change in internal energy here: brainly.com/question/4654659

4 0
2 years ago
A 0.14 -kg baseball is moving at 41 m/s. A 0.058-kg tennis ball is moving at 67 m/s. Which of the two balls has higher kinetic e
Iteru [2.4K]
Since kinetic energy is a form of energy using the equation KE=¹/₂mv², the units of measurement is in Joules (J). Therefore, the tennis ball had more kinetic energy than the baseball since velocity is a larger factor than the mass is when determining kinetic energy.

3 0
3 years ago
Read 2 more answers
What’s the velocity of a car traveling 144km in 90 minutes per hour
S_A_V [24]

Answer:

96 mph

Explanation:

There are a couple of ways of doing this, but I will just use a proportion.

first off 1 hour = 60 minutes.

So 144/90 = x/60 will give me the answer per 60 minutes of miles per hour.

cross multiply to get  90x = 8640

divide by 90 to get 96 miles per 60 minutes or 96 mph.

Hope this helped.

4 0
3 years ago
What's the job of a resistor in an electric circuit?
erica [24]
A resistor is a device which resist the flow of current in the circuit.

5 0
3 years ago
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