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viktelen [127]
4 years ago
5

An iron sphere with a mass of 75.00 g is heated to a temperature of 385.0°c. it is then placed in a beaker containing 150.0 g h

2o at 100.0°c. how much heat energy must the water absorb to boil away completely? kj what is the maximum amount of heat the iron can release to the water? kj
Physics
1 answer:
gizmo_the_mogwai [7]4 years ago
5 0

Question one the answer is 339 kj

Question two the answer is 9.02 kj

Question three - No

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A fully loaded, slow-moving freight elevator has a cab with a total mass of 1400 kg, which is required to travel upward 37 m in
kogti [31]

Answer:

789.8 W

Explanation:

mass of the cab = 1400 kg, the counter weight of the elevator = 930 kg

weight of the cab = 1400 × 9.81 where weight = mg and m is mass and g is acceleration due to gravity.

weight of the cab = 13734 N

counter weight of the elevator = 930 × 9.81 = 9123.3 N

the exerted force of the elevator = weight of the cab - counter weight of the elevator = 13734 - 9123.3 = 4610.7 N

Average power by the motor P = F × v = F × distance / time

where v is speed in m/s, and time is in seconds

P = 4610.7 × 37 / ( 3.6 × 60) = 789.80 W

where (3.6 × 60 ) is the time in seconds

6 0
3 years ago
1. How can researchers, educators, and policymakers encourage journalists and others to discuss
Setler79 [48]

Correlational studies do not form the  decision making or discussion because they do not offer conclusive evidence.

<h3>What are correlational findings?</h3>

The term correlational findings refers to research findings that only show the association between variables. This is a kind of research that does not establish causation but suggests a strong link between two variables.

This kind of study should not form the basis for decision making or discussion because they do not offer conclusive evidence about an issue. this kind of findings should e taken with a pinch of salt until the data is further confirmed by experimental studies.

Learn more about correlational findings:brainly.com/question/15411622

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6 0
2 years ago
What are the three longest wavelengths for standing sound waves in a 121-cm-long tube that is (a) open at both ends and (b) open
irina [24]

Answer:A)For open pipe

1stπ=484cm

2nd wavelength=161.3cm

3rd is=96.8cm

B)For closed pipe

1st wavelength=242cm

2nd=121cm

3rd wavelength=80.7cm

Explanation:

An open pipe produces a standing waves whose wavelength is related to it's length(length of pipe) by nL/4=π ,where n represent odd integers 1,2,3...

So the first note called fundamental note or 1st Harmonic is L=π/ 4,121=π/ 4

π= 121×4=484cm

Third harmonic,L=3π /4

So π= 4l/3=4×121/3=161.3cm

The 3rd wavelength is

Fifth harmonic=

π =4l/5=4×121/5=96.8cm

For a pipe open at one end and closed at the other also called closed pipe

Fundamental note is

2L/n= π where n=1,2,3....ie integers

First wavelength

π=2L=2×121=242cm

Second wavelength

π=L=121cm

Third is

π=2L/3=2×121/3=80.7cm

3 0
3 years ago
If different groups of scientist have access to the same data, how can they draw different conclusions?
vazorg [7]

If a group of scientists have access to one data, from the data they can draw conclusions either through mathematics or just thought experiments.

Those thought experiments is different for any scientist, no one thinks the same especially when the topic is difficult.

For example when talking about parallel universes, scientists have come up with the weirdest examples of a multiverse. Some thinking of a brane universe, while others say that its a landscape universe, quilted universe. All of their 'evidence' seems correct but they have opposite meanings.

A weird analogy is 'religion'. All the religions seem to have 'evidences' (hardly) that attract people towards it, they all make sense but that doesn't mean that their evidence is right.

----

Now if they're trying to break down the data using maths, there could be a great uncertainty and measurement error that if done enough could change the whole idea behind the data.

Interesting question, I can babble for days for this but lets keep it as that

6 0
3 years ago
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A wave is a disturbance that carries from one place to another through matter of space
krok68 [10]

There's supposed to be a blank in the statement, where the answer is supposed to be inserted.

The question is supposed to say: "A wave is a disturbance that carries ______ from one place to another through matter or space".

To answer the question, write the word "<em>energy</em>" in the blank.

4 0
3 years ago
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