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2 years ago

The information about groundwater recorded by a student is valid when

2 answers:

7 0

Such information is valid when A. it is not biased.
There is no bias in science - the results are either correct or incorrect; personal opinions have nothing to do with that. B is incorrect because the point of experiments is that they can be repeated to achieve the same results. C and D are likewise incorrect as primary sources are important, and you can share the results with others if you want to.

Alik [6]2 years ago

4 0

Answer:

a. it is not biased

Explanation:

Scientific information can not be biased to be credible and valid, and it is only possible to be sure that this scientific information is true if the results are repeated in different types of experiments and tests. We can not forget that scientific information gains credibility with primary sources that give scientific background to the statements, moreover, the purpose of formulating scientific information is to share information and let everyone know about it.

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The second law of thermodynamics imposes what limit on the efficiency of a heat engine? The second law of thermodynamics imposes

Dahasolnce [82]

The Second Law of Thermodynamics states that the state of entropy of the entire universe, as an isolated system, will always increase over time.

Take that as you will

5 0

2 years ago

Calculate the average velocity in m/y of a tectonic plate that has travelled 9000 km to the south in 60 million years

Gekata [30.6K]

The distance covered by the tectonic plate, in meters, is
 $d=9000km=9\cdot 10^6 m$ 
The time taken for the tectonic plate to cover this distance is equal to
 $t=60 mil.y=60 \cdot 10^6 y$ 
Therefore, the average velocity of the tectonic plate is the ratio between the distance covered and the time taken:
 $v= \frac{S}{t} = \frac{9\cdot 10^6m}{60 \cdot 10^6y} =0.15 m/y.$

8 0

2 years ago

If a force always acts perpendicular to an object's direction of motion, that force cannot change the object's kinetic energy.

laiz [17]

This is very good conceptual question and can clear your doubts regarding work-energy theorem.
Whenever force is perpendicular to the direction of the motion, work done by that force is zero.
According to work-energy theorem,
Work done by all the force = change in kinetic energy.

here, work done = 0.
Therefore,
0=change in kinetic energy
This means kinetic energy remains constant.
Hope this helps

5 0

2 years ago

Turner's treadmill runs with a velocity of -1.3 m/s and speeds up at regular intervals during a half-hour workout. after 25 min,

Travka [436]

Given : Initial velocity = -1.3 m/s

Final Velocity = -6.5 m/s.

Time = 25 minutes.

To find : Average acceleration.

Solution: We are given units in meter/second (m/s).

So, we need to convert time 25 minutes in seconds.

1 minute = 60 seconds.

25 minutes = 60*25 = 1500 seconds.

Formula for average acceleration is given by,

$\frac{Final \ velocity -Initial \ velocity}{Final \ time - Initial \ time }$

We are not given intial time, so we can take initial time =0.

Plugging values in the above formula.

$Average \ acceleration = \frac{-6.5 -(-1.3)}{1500-0}$

= $\frac{-5.2}{1500}$

= -0.003467

or $Average \ acceleration = -3.467 \times 10^{-3}\ m/s^2.$ .

3 0

2 years ago

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The diagram shows movement of thermal energy. At bottom a fire has red curved lines labeled Y with arrowheads pointing upward to

Pepsi [2]

Answer:

X and Z

Explanation:

Conduction occurs through direct physical contact. Heat transferred from the pot to the handle, and from the handle to the hand, are both examples of conduction.

6 0

2 years ago

Read 2 more answers