Your answer is. D. 10÷60 = 1.66km/hr
Time = (distance) / (speed)
Distance = 3,000 km = 3,000,000 meters
Speed = 200 m/s
Time = (3,000,000 m) / (200 m/s)
Time = <em>15,000 seconds</em>
That's 4 hours 10 minutes
Answer:
D.The mass and the latent heat of fusion.
Explanation:
When a block of ice is at its melting point, it doesn't need any additional heat in order to reach that temperature. Instead, it needs heat in order to break the bonds between the molecules and change state from solid to liquid. During the phase change, the temperature of the substance does not change, since all the heat provided is used to break the bonds between the molecules.
The heat needed for the phase change is
where
m is the mass of the block
is the latent heat of fusion
Therefore, we see that the correct answer is
D.The mass and the latent heat of fusion.
Answer:
Option B
Explanation:
Given
The current flowing through the circuit = 1 Ampere
As we know
I is inversely proportional to resistance.
I α 1/r
or I = k/r
If the resistor "r" is replaced by any resistor "R" with resistance = 2r, then the current will be
I = 1/2 of 1 ampere
I = 0.5 Ampere
Hence, option B is correct
In natural systems, both energy and matter are conserved. This means that while energy and matter can change forms, neither can they be created nor destroyed. Energy and matter are frequently cycled within a system, and various forms of matter and energy can interact.
<h3>Explain conservation of energy?</h3>
- The first law of thermodynamics, also known as the law of conservation of energy, states that the energy of a closed system must remain constant—it cannot increase or decrease without external interference.
- There are three fundamental quantities that are conserved in mechanics. There are three of them: energy, momentum, and angular momentum.
- Limiting your energy consumption reduces your environmental impact. The longer we wait to make significant changes, the more dangerous global warming and climate change become to our daily lives. When we burn fossil fuels, we emit a massive amount of greenhouse gases.
To learn more about energy conservation refer to :
brainly.com/question/166559
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