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faltersainse [42]
3 years ago
8

Greek philosophers such as Demoncritus and Aristotle had ideas about the composition of matter. For example, Demoncritus believe

d matter was made of tiny, solid spheres that he called atomos, and Aristotle thought matter was made up of earth, water, fire, and air. Aristotle's idea of matter was the accepted idea for over 2,000 years until John Dalton came up with a new theory about matter based on his experimental data. Which of the following best explains why Dalton's theory became more widely-accepted over Aristotle's theory?
A) Aristotle's theory became the law of conservation of mass when he documented phase changes of matter.

B) Dalton's theory was more complete because more respected scientists found the ideas possible.

C) Aristotle's theory did not have enough direct evidence due to poor observational tools.

D) Dalton's theory had repeated observations which were supported by extensive evidence.
Physics
1 answer:
tino4ka555 [31]3 years ago
6 0

Answer:

D) Dalton's theory had repeated observations which were supported by extensive evidence.

Explanation:

Dalton had a basis for this prediction and theory. He worked extensive on gases before stepping forward with the Dalton's atomic theory.

His scientific conjecture was highly corroborated with a wide array of experimental evidence and many infallible proofs.

  • Science is a logical way of reasoning that follow methodological approaches.
  • It deals with empirical experimental proofs that must have been gathered and the veracity ascertained.
  • Dalton during his time presented the scientific community with a pool of observations balanced with experimental evidences he accumulated with time.  
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2 years ago
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(b) Can the speed of a rocket exceed the exhaust speed of the fuel? Explain.
muminat

<u>Yes. The speed of a rocket can exceed the exhaust speed of the fuel.</u>

How this is explained?

  • The thrust of the rocket does not depend on the relative speed of the gases or the relative speed of the rocket.
  • It depends on conservation of momentum.

What is conservation of momentum?

  • Conservation of momentum, general law of physics according to which the quantity called momentum that characterizes motion never changes in an isolated collection of objects; that is, the total momentum of a system remains constant.
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1 year ago
The mass of a radioactive substance follows a continuous exponential decay model, with a decay rate parameter of 1% per day. A s
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Answer:

2,38kg

Explanation:

Mass in function of time can be found by the formula: m_{(t)} =m_{0} e^{-kt}, where m_{0} is the initial mass, t is the time and k is a constant.

Given that a sample decay 1% per day, that means that after first day you have 99% of mass.

m_{(1)} =m_{0} e^{-k(1)}, but m_{(1)}=\frac{99m_{0} }{100}, so we have \frac{99m_{0} }{100}=m_{0}e^{-k}, then k=-ln(\frac{99}{100})=0.01

Now using k found we must to find m_{(5)}.

m_{(5)}=m_{0}e^{-(0.01)5}=2.5kge^{-0.05} =2.5x0.951=2.38kg

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2 years ago
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gizmo_the_mogwai [7]

Answer:

C: You must know force and distance to calculate both.

Explanation:

A force is said to have done work, when it has succeeded in causing displacement in an object from its starting point.

Power can be defined as the rate of doing work.

The work can be calculated using the following formula:

Work done = Force × Displacement

The power can be calculated using the following formula:

Power = Work \ Time

In order to calculate the work and power, the force and distance should be known. The force and distance will help in the calculating the work, which will in turn help in the calculation of the power of the object.

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