Answer:
1. The change from a liquid state to a gaseous state: boiling (evaporation)
2. The change from a gaseous state to a liquid state: condensation
3. The change from a solid state to a liquid state: melting
4. The change from a liquid state to a solid: freezing
5. The change from a solid state to a gaseous state: sublimation
6. The change from a gaseous state to so solid: deposition
7. A change of state: phase change
Explanation:
<em>A change of state is a physical change a substance suffers, it changes it physically but not chemically. In the image I added you can observe how these changes occur between the solid, liquid and gaseous states.</em>
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Answer:
the current in the wire is 0.008333333 A
Explanation:
The computation of the current in the wire is as follows;
Current in the wire is
= Total charge ÷ cross sectional area of the wire
= 7.5 × 10^-3C ÷ 0.9s
= 0.008333333 A
Hence, the current in the wire is 0.008333333 A
We simply applied the above formula so that the correct current of the wire could come
And, the same is considerd and relevant too
Answer:
The average power provided by the tension in the cable pulling the lift is = 714 W
Explanation:
Given data
Mass = 71 kg
Change in height = 123 m
When the lift moves in upward direction then in that case kinetic energy is constant & only potential energy changes.
Change in potential energy Δ PE = m g ( )
Δ PE = 71 × 9.81 × 123
Δ PE = 85670.73 J
Time = 2 min = 120 sec
So average power is given by
Therefore the average power provided by the tension in the cable pulling the lift is = 714 W
The amount of coal burnt to operate the mini fridge is 0.81 metric tons.
<h3>What is energy cost?</h3>
The term energy cost refers to the monetary cost of operating a particular electrical appliance. Let us now answer the questions one after the other.
a) Power consumption per hour = 100 watt or 0.1kW. To operate it for an hour we have 0.1kWhr × $0.10/kWh = 0.01$ Since it operates for twelve hours a day 12(0.01$)= 0.12$ per day. In five years; 0.12$× 5 × 365 = 219 $.
b) Electricity used for the five years = 5 × 365 × 12 × 0.1kWhr = 2190 kWhr
Since 1 metric ton of coal produces 2713 kWh(considering energy losses)
x metric tons of coal produces 2190 kWhr
x = 1 metric ton × 2190 kWhr/2713 kWh
x = 0.81 metric tons
c) In part 1 we did not include the cost of the environmental damage caused by the mining of coal and the social inconveniences caused by the sound of the mini fridge.
d) The college student could reduce the electricity use associated with having a mini fridge in his or her dorm room by turning it off for some hours within the day.
Learn more about cost of electricity: brainly.com/question/13498414