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il63 [147K]
3 years ago
6

Over the last several decades, scientists have addressed the problem of nonrenewable natural resources such as fossil fuels. Hum

ans are using fossil fuels at a rapid rate and scientists believe that one day we will run out of them. To solve this problem, research has been conducted on alternative energy sources. One alternative energy source is nuclear energy. Although nuclear energy is a good solution to this problem, there are concerns.
Which of these is NOT a benefit of nuclear energy?


A) fossils fuels are not required
B) does not contribute to global warming
C) presence of hazardous radioactive materials
Eliminate
D) little carbon emissions released into the air
Physics
2 answers:
jeka943 years ago
8 0

Answer:

c.

Explanation:

presence of hazardous radioactive materials

ExtremeBDS [4]3 years ago
4 0

Answer:

Option (C)

Explanation:

The nuclear energy is defined as a type of energy which liberates either by the process of nuclear fusion or nuclear fission and is mainly used to generate electricity. This energy is stored in the core of an atom (or nucleus).

It is highly effective, cost-effective and there is no emission of greenhouse gases.

But it also has some disadvantages, of which one is that it produces radioactive waste materials, which are difficult to dispose these substances and is also a very expensive method. These materials emit radiations that are harmful to the organisms. So, it is very challenging to dispose these radioactive waste materials.

Thus, the correct answer is option (C).

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A 70-cm-diameter wheel accelerates uniformly from 160rpm to 280rpm in 4.0s. Determine (a) its angular acceleration, and (b) the
poizon [28]

Explanation:

Given that,

Diameter of the wheel, d = 70 cm = 0.7 m

Initial angular speed, \omega_i=160\ rpm=16.75\ rad/s

Final angular speed, \omega_f=280\ rpm=29.32\ rad/s

Time, t = 4 s

(a) Angular acceleration,

\alpha =\dfrac{\omega_f-\omega_i}{t}\\\\\alpha =\dfrac{29.32-16.75}{4}\\\\\alpha =3.14\ rad/s^2

(b) Tangential acceleration is :

a=r\alpha \\\\a=0.35\times 3.14\\\\a=1.085\ m/s^2  

Angular speed of the wheel after 2 seconds is :

\omega_f=\omega_i+\alpha t\\\\\omega_f=16.75+3.14\times 2\\\\\omega_f=23.03\ rad/s

Radial acceleration will be :

a=\omega_f^2r\\\\a=(23.03)^2\times 0.35\\\\a=185.6\ m/s^2

Hence, this is the required solution.

4 0
3 years ago
Electrons are (2 points)
ddd [48]
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4 years ago
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Select the correct equations that show that the gravitational potential energy of a 1000-kg boulder raised 6 m above ground leve
wel

Answer:

U = mgh

Explanation:

The gravitational potential energy of an object is defined as:

U=mgh

where

m is the mass of the object

g is the gravitational acceleration

h is the height of the object above a reference level (usually, the ground)

For the boulder in the problem,

m = 1000 kg

g = 10 N/kg

h = 6 m

Substituting,

U=(1000)(10)(6)=60,000 J

6 0
4 years ago
A comet is traveling in outer space with a velocity of 2000 m s. How long will it take to travel 300.000 meters?
nevsk [136]

Answer:

.15s

Explanation:

Follow the units here. If you divide 300.000m by 2000m/s then you'll end up with the meters reduced and just the seconds. So that's what you do to get the time:

(300.000m)/(2000m/s ) =

(300.000/2000)(m•s/m) =

0.15s

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4 years ago
If a wave had a wave speed of 1000 m/s and a frequency of 500 Hz, what is its wavelength?
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Answer:

<h2>2 meters</h2>

Explanation:

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