Answers
Answer:
can u buy me a giftcard ill have this done in no time
Explanation:
Related Questions
why might someone buy a more expensive CFL intead of an incandescent light bulb ?
Answers
Answer:
Even though CFL are more expensive, they tend to last longer. Research proves that CFL uses 1/4 to 1/3 the same amount of energy to produce the same lighting as an incandescent light bulb (source: enhso.com)
Which energy source has no greenhouse gas emissions or health impacts on humans, but is only
available in certain geographic locations?
Answers
Answer: geothermal
Explanation:
The geothermal energy source has no greenhouse gas emissions or health impacts on humans.
What is geothermal energy?Geothermal energy can be described as the thermal energy in the Earth's crust which arises from the formation of the planet and from the radioactive decay of materials.
The high temperature in Earth's interior cause rock to melt and solid mantle to behave plastically. The mantle convects upward since it is lighter than the surrounding rock. Temperatures at the core-mantle boundary reach over 4000 °C.
Geothermal heating can use water from hot springs and geothermal power means the generation of electricity from geothermal energy, which has gained importance.
Earth's geothermal resources are more than adequate to supply humanity's energy needs, although a small fraction is currently being profitably exploited, commonly in areas near tectonic plate boundaries.
The greenhouse gas emissions of geothermal stations are on average 45 g of CO₂ per kWh of electricity or less than 5% of that of conventional coal-fired plants.
Learn more about Geothermal energy, here:
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A train starts from rest at station A and accelerates at 0.5 m/s 2 for 60 s. Afterwards it travels with a constant velocity for 15 min. It then decelerates at 1 m/s2 until it is brought to rest at station B. Determine the distance between the stations.
Answers
Answer:
d = 28,350 m.
Explanation:
We can divide the problem in 3 parts, according to the type of movement that train had:A distance traveled while the train was speeding up.A distance traveled at constant speed.A distance traveled while the train was slowing down.For the first part, we can get the distance traveled using the kinematic equation for the displacement, starting from rest, as follows:[tex]x_{1} = \frac{1}{2} * a * t^{2} = \frac{1}{2} *0.5m/s2* (60s)^{2} = 900 m. (1)[/tex]
In order to get the final speed at this distance, we can simply apply the definition of acceleration, in this way:[tex]v_{f1} = a* t = 0.5 m/s2 * 60 s = 30 m/s (2)[/tex]
Since the second part is traveled at a constant speed, we can find the displacement applying the definition of average velocity, as follows:[tex]x_{2} = v_{f1} * t = 30 m/s* 60 s* 15 = 27,000 m (3)[/tex]
Finally, as we know the value of the deceleration, and that the final velocity is zero from the givens, we can apply the following kinematic equation to get the displacement during the third stage:[tex]v_{f3}^{2} - v_{o3} ^{2} = 2* a_{3} * x_{3} (4)[/tex]
Replacing by the values and solving for x₃, we get:[tex]x_{3} = \frac{v_{o3}^{2}}{2*a_{3} } = \frac{(30m/s)^{2}}{2*1m/s2} = 450 m (5)[/tex]
The total distance d is just the sum of x₁, x₂ and x₃, from (1), (3) and (5), as follows:d = x₁ + x₂ + x₃ = 900 m + 27,000 m + 450 m = 28,350 m.A transformer has an output coil with 6 times as many turns as the input coil. If the input frequency is f then the output frequency will be:_______
a. 9f
b. 6f
c. 1/6 f
d. f
Answers
Answer:
d. f
Explanation:
Based on the principle of operation of transformer, when a.c voltage is applied at the terminal of the primary coil (input coil), an alternating magnetic flux is produced in the iron core which links the secondary coil (output coil).
Also, an alternating e.m.f of the same frequency as that of primary coil (input coil) will be induced in the secondary coil (output coil) by mutual inductance.
Thus, If the input frequency is "f" then the output frequency will be "f" (since the frequency will be the same).
The correct option is "D"
Pushing a door closed is an example of force. true or false
Answers
Answer:
True
Explanation:
I am not 100% on the answer for this question but i hope it was right
Pushing is a force so that statement is true