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Over [174]
3 years ago
12

60 POINT!!!!!!

Physics
2 answers:
Paladinen [302]3 years ago
7 0

Answer:

h and I have been working on the sea for the last few days

Wittaler [7]3 years ago
4 0

Answer:

Samples 2 and 4 are the same liquid

Explanation:

Samples 2 and 4 should be the same liquid because they have the same density as well as the same boiling point. The mass and volumes given do not matter in this case, however they could be used to calculate the density which was already given.

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A train traveled 85 mph for 7 hours how far did it travel?
Sergio [31]

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12.1429 miles per hour

Explanation:

4 0
3 years ago
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Clear cutting has a similar effect as controlled burning of a forest. <br><br> True<br><br> False
mariarad [96]
<span>Clear cutting has a similar effect as controlled burning of a forest is True.


True </span>
3 0
3 years ago
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Explain the relationship between brightness and distance. Explain by relating the brightness of the light to the energy of the l
Iteru [2.4K]

Answer:

What part of the light wave is related to the brightness of the light?

Amplitude

The amplitude of a wave tells us about the intensity or brightness of the light relative to other light waves of the same wavelength

The brightness of light is related to intensity or the amount of light an object emits or reflects. Brightness depends on light wave amplitude, the height of light waves. Brightness is also somewhat influenced by wavelength.

4 0
3 years ago
if it is true that the net charge in the universe does not change, how is it ever possible to charge an object that was initiall
olga55 [171]

By transferring electrical charges from one object to another

Explanation:

The law of conservation of electric charge states that the total electric charge of the universe is constant, therefore no charge can be created or destroyed, but only transferred.

Indeed, when an object is charged, this is due to the fact that charge carriers (typically electrons) are transferred to/from the object.

Consider an object initially neutral: this means that the object has initially an equal amount of positive charges (protons) and negative charges (electron).

Later, if we remove electrons from the object, then it will remain with an excess of protons: therefore, it will be positively charged. However, the electrons have not disappeared: simply, they have been moved somewhere else (on another object, for example, which will become negatively charged: so, the total net charge will still be zero).

Similarly, if we add electrons to the object, it will become negatively charged: however, the electrons have been removed from another object which is now positively charged, so the net charge still has not changed.

Learn more about electric charges:

brainly.com/question/8960054

brainly.com/question/4273177

#LearnwithBrainly

8 0
3 years ago
A raft of 180 kg carries two swimmers with masses of 50 kg and 80 kg. The raft is initially floating at rest. The two swimmers s
nirvana33 [79]

Answer:

v=0.5m/s

Explanation:

Given a raft of 180kg, and two simmers of 50kg and 80kg:

The two rafts have an initial velocity of zero:

\bigtriangleup P_{raft}+\bigtriangleup  P_{50}+\bigtriangleup  P_{80}=0\\\\m_R\bigtriangleup  v_R+m_{50}\bigtriangleup  v_{50}+m_{80}\bigtriangleup  v_{80}=0\\\\m_R\bigtriangleup  v_R=-m_{50}\bigtriangleup  v_{50}-m_{80}\bigtriangleup  v_{80}\\\\\bigtriangleup v_R=\frac{-m_{50}\bigtriangleup  v_{50}-m_{80}\bigtriangleup  v_{80}}{m_R}\\\\\bigtriangleup v_R=\frac{-(50kg\times3m/s+80kg\times-3m/s)}{180kg}\\\\\bigtriangleup v_R=0.5m/s

Hence, the raft starts moving with avelocity of 0.5m/s

-The raft will continue moving in the direction it was initially moving. The raft has a larger mass than the combined mass of the two swimmers, by law of momentum conservation, it's change in velocity will be negligible.

8 0
4 years ago
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