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3 years ago

Form hypothesis: Where do you think we humans get energy?

2 answers:

5 0

We humans get energy from the food we eat. If we eat the right kind of food that is healthy for us, we should be full of good energy to last us a good while and should not tire easily.

8090 [49]3 years ago

4 0

Humans get their energy from the food we eat. When we humans eat herbs (healthy foods) like lettuce tomatoes etc. We get more energy from the healthy foods than the unhealthy foods, Hope this helps!! Have a nice day! ^w^

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Pls helppppp my last question!

nexus9112 [7]

Answer:

load

a generator, a light bulb (load) and a closed switch

Explanation:

as explained in the other question, the fan is using generated electric energy to create mechanical movement. as such it is a load on the grid or circuit or net.

and electric power can only flow, if there is a closed (uninterupted) circuit from the power source to a load and back.

any open switch is an interruption of the circuit.

a buzzer is a kind of switch. it closes the circuit (and puts a load on) only when somebody presses it.

by the way, a closed circuit without a load will "destroy" (short circuit) the power source or at least the wires (burn through).

4 0

2 years ago

Need help ASAP

zhannawk [14.2K]

For number one, the answer is the first dash mark

And for number two, the answer is the 4th dash.

5 0

3 years ago

The specific heat of water in its solid phase (ice) is 2090 J/(kg K), while in the liquid phase (water) its specific heat is 419

oee [108]

Answer:

d. 149 ⁰C.

Explanation:

Given;

mass of the block of ice, m = 2 kg

specific heat capacity of the ice, C = 2090 J/(kgK)

initial temperature of the ice, t₁ = -90 ⁰C

heat added to the ice, H = 1,000,000 J

let the final temperature of the ice = t₂

The final temperature of the ice after adding the heat is calculated as follows;

$H = mC_{ice} \Delta t\\\\H = mC_{ice} (t_2 - t_1)\\\\1,000,000 = 2 \times 2090 \times (t_2 - (-90))\\\\1,000,000 = 4,180(t_2 +90)\\\\1,000,000 = 4,180t_2 + 376,200\\\\1,000,000 - 376,200 = 4,180t_2\\\\623,800 = 4,180 t_2\\\\t_2 = \frac{623,800}{4,180} \\\\t_2 = 149 \ ^0C$

Therefore, the new temperature of the water is 149 ⁰C.

4 0

3 years ago

The gravitational force between two objects is proportional to the square of the distance between the two objects.

Darina [25.2K]

Answer: True!

Explanation: The force is proportional to the square of the distance between 2 point masses

3 0

3 years ago

what is the energy efficiency of a coal burning power plant, and incandescent light bulb and the electrical transmoission lines

vlabodo [156]

the energy efficiency of a coal burning power plant is 33% and incandescent light bulb is only 10% and the electrical transmission lines between the power plant and the house is 70 %.

<h3>What is energy Efficiency?</h3>

The definition of energy efficiency is the use of less energy to carry out an activity or achieve a goal. Homes, buildings, and manufacturing facilities that use less energy to manufacture things require less energy to heat, cool, and operate appliances and gadgets.

One of the simplest and most economical methods to slow climate change, lower consumer energy bills, and boost the competitiveness of American businesses is via energy efficiency. In order to achieve net-zero emissions of carbon dioxide through decarbonization, energy efficiency is also a crucial factor.

that the average efficiency of coal-fired power plants around the world today is 33 percent.

an incandescent bulb is only 10% efficient.

the electrical transmission lines between the power plant and the house is 70 %.

to learn more about energy efficiency go to - brainly.com/question/14280607

#SPJ4

7 0

2 years ago