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olga_2 [115]
3 years ago
14

Static energy is an enemy and a friend both. Give reason

Physics
2 answers:
ExtremeBDS [4]3 years ago
8 0

Answer:

In their personal lives, most people regard energy as an essential friend. It powers our computers, warms our homes in the winter, fuels our cars and planes, and provides a necessary input to produce virtually everything we use. Modern life would be inconceivable without the friendly side of energy.

But in recent decades, energy has also become an enemy. Presidents have lamented our “addiction to oil,” we have gone to war to protect oil fields from hostile powers, and air pollution from fossil fuels kills tens of thousands of people every year. Perhaps most worrisome, the accumulation of greenhouse gases such as carbon dioxide threatens to change the earth’s climate in ways that are unpredictable and potentially dangerous.

The two faces of energy are the primary reason why energy policy is so controversial and tangled. We need national policies that address the enemies of pollution and global warming. But because energy is such a large part of consumer budgets and so central to our advanced economies, people are reluctant to allow energy prices to reflect the true social costs of energy consumption. We see this tradeoff play out in energy and environmental policy year in and year out.

Explanation:

bonufazy [111]3 years ago
6 0

oAnswer: because i can hurt you and i would say its funny and cool

Explanation:

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3 years ago
A baseball m=.34kg is spun vertically on a massless string of length l=.52m. the string can only support a tension of tmax=9.9n
larisa86 [58]
<span>4.5 m/s This is an exercise in centripetal force. The formula is F = mv^2/r where m = mass v = velocity r = radius Now to add a little extra twist to the fun, we're swinging in a vertical plane so gravity comes into effect. At the bottom of the swing, the force experienced is the F above plus the acceleration due to gravity, and at the top of the swing, the force experienced is the F above minus the acceleration due to gravity. I will assume you're capable of changing the velocity of the ball quickly so you don't break the string at the bottom of the loop. Let's determine the force we get from gravity. 0.34 kg * 9.8 m/s^2 = 3.332 kg m/s^2 = 3.332 N Since we're getting some help from gravity, the force that will break the string is 9.9 N + 3.332 N = 13.232 N Plug known values into formula. F = mv^2/r 13.232 kg m/s^2 = 0.34 kg V^2 / 0.52 m 6.88064 kg m^2/s^2 = 0.34 kg V^2 20.23717647 m^2/s^2 = V^2 4.498574938 m/s = V Rounding to 2 significant figures gives 4.5 m/s The actual obtainable velocity is likely to be much lower. You may handle 13.232 N at the top of the swing where gravity is helping to keep you from breaking the string, but at the bottom of the swing, you can only handle 6.568 N where gravity is working against you, making the string easier to break.</span>
7 0
4 years ago
Read 2 more answers
which of the following are vector quantities? check all that apply. a. time b. displacement c. force d. mass
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4 years ago
Imagine an isolated positive point charge Q (many times larger than the charge on a single proton). There is a charged particle
egoroff_w [7]

Answer:

Explanation:

The magnitude of the electric force on this charged particle A depends upon the following

5. the distance between the point charge Q and the charged particle A

8. the amount of the charge on the point charge Q

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7 0
3 years ago
Explain what happens to a light wave that hits the surface of a pool.
brilliants [131]

A light wave that hits the surface of a pool gets refracted and gives us an apparent image of the surface of the pool, following the concepts of refraction.

<u>Explanation:</u>

Let’s recall the concept of refraction when a light wave passes from medium of rarer to denser. There is a change in the speed of light while travelling from medium of rarer to denser.

There can be a change in the direction as well. This property is known as “Refraction” and the best example to see refraction is watching the surface of a clean pond, lake or pool.

When the light travels from a rarer medium (air) to a denser medium (water), it changes its angle of direction and gets refracted and hit to our eye lenses. With this, we see the surface of the pool at a changed angle and it seems to be a bit shallow than its original depth.

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