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spayn [35]
3 years ago
9

Even though when we use this non–renewable resource to generate power it is harmful to the environment, it is still the most pop

ular resource used in the United States.
A. coal
B. natural gas
C. nuclear
D. petroleum

I'm giving brainiest to whoever comments first!
Physics
2 answers:
mart [117]3 years ago
6 0
I think the answer is coal or natural gas
jarptica [38.1K]3 years ago
5 0
<h2>A. Coal</h2><h2 />

Coal produces half of the electricity in the United States.  Sadly, when coal is burned as fuel, it gives off carbon dioxide, the main greenhouse gas that is linked with global warming.

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What distance will a car traveling at a speed of 15 m/s cover in 300 s?
AnnZ [28]

Distance formula: d = st

d = 15 * 300

d = 4,500m

Best of Luck!

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Give one real-life example of the Doppler Effect and explain what causes this phenomenon. Please write at least 3 complete sente
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Dipper effect of an oncoming train get louder as it approaches and sound diminishes as it goes away sound traveling
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A person hits a 45-g golf ball. The ball comes down on a tree root and bounces
Verizon [17]

Answer:

Maximum height, h = 10 m          

Explanation:

It is given that,

Mass of golf ball, m = 45 g = 0.045 kg

The ball comes down on a tree root and bounces  straight up with an initial speed of 14.0 m/s.

We need to find the height the ball will rise  after the bounce. It is based on the conservation of energy such that,

\dfrac{1}{2}mv^2=mgh

h is maximum height raised by the ball

h=\dfrac{v^2}{2g}\\\\h=\dfrac{(14)^2}{2\times 9.8}\\\\h=10\ m

So, the ball will raised to a height of 10 meters.

5 0
3 years ago
What are two conditions of equilibrium? write them in word​
valentina_108 [34]
In order for a system to be in equilibrium , two conditions must be met. Net force must be 0.
6 0
3 years ago
If the system is operated on mars, through what distance would the 18.0-kg mass have to fall to give the same amount of kinetic
-Dominant- [34]
The previous part of the exercise says:
"<span>Engineers are designing a system by which a falling mass m imparts kinetic energy to a rotating uniform drum to which it is attached by thin, very light wire wrapped around the rim of the drum. There is no appreciable friction in the axle of the drum, and everything starts from rest. This system is being tested on Earth, but it is to be used on Mars, where the acceleration due to gravity is 3.71 m/s². In the Earth tests, when m is set to 18.0 kg and allowed to fall through 5.50 m, it gives 300.0 J of kinetic energy to the drum."

Since Kearth = Kmars, we have, for conservation of energy, that also the potential energies must be equal:
Uearth = Umars

which means:
m </span>· gearth · hearth = m · gmars <span>· hmars

we can solve for hmars:
hmars = (gearth / gmars) </span>· hearth
           = (9.8 / 3.71) · 5.50
           = 14.53m

Therefore, the correct answer will be: the mass would have to fall from an height of 14.53m.

5 0
3 years ago
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