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Pavel [41]
3 years ago
13

Which materials, including polystyrenes, can be recycled?

Physics
2 answers:
True [87]3 years ago
4 0
Polymers as they are made from plastic
Oksanka [162]3 years ago
4 0

Answer:

Polymers , thermoplastics.

Explanation:

Polymers like thermoplastic polymers can be recycled because they can be melted easily but thermosetting polymer can not be recycled because of their high melting point. Ceramics due to their high melting point are not recycled.

Thermoplastic composites can be recycled but thermoseting composites are not recycled. Composites are mix of two or more type of material having different physical and chemical properties.

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A 3.00-kg box is sliding along a frictionless horizontal surface with a speed of 1.8 m/s when it encounters a spring. (a) Determ
aniked [119]

Answer:

a) k= 3594,7 N/m

b) v= 0.55 m/s

Explanation:

  • a)
  • As the surface is horizontal, the only change in energy will be the change in kinetic energy, as the box comes to an stop after compressing the spring.
  • As we know that the surface is frictionless also, this change in kinetic energy must be equal to the change in the elastic potential energy of the spring.
  • So we can write the following equality:

       \Delta K = \Delta U

       where \Delta K = \frac{1}{2}*m*v^{2}

       and \Delta U = \frac{1}{2} * k* \Delta x^{2}

  • Simplifying and replacing by the values, we get:

        3.00 kg* (1.8 m/s)^{2} = k* (0.052 m) ^{2}        

  • Solving for k:

k = \frac{3.00kg*(1.8m/s)^{2} }{(0.052m)^{2}} = 3594.7 N/m

  • k = 3594.7 N/m
  • b)
  • For this part, we can just apply the same equality, replacing the value of k by the one we got, and solving for the initial speed v:

        v = \sqrt{\frac{k*\Delta x^{2}}{m} } = \sqrt{\frac{3594.7N/m*(0.016m)^{2} }{3.00kg}} = 0.55 m/s

  • v = 0.55 m/s
6 0
3 years ago
In a face, you run 3000 meters east in 21 minutes. What is your velocity in km/min?
Anni [7]

3 \times  \ 21
7 0
3 years ago
The analysis of how people relate to each other is known as
Colt1911 [192]
Anthropology 

Hope this helps! ^-^
4 0
3 years ago
What is the force applied to a baseball that has a mass of 142kg and has a acceleration of 30m/s to the power of 2
aev [14]
  • Mass=m=142kg
  • Acceleration=a=30m/s
  • Force=F

Using Newton's second law

\\ \sf\Rrightarrow F=ma

\\ \sf\Rrightarrow F=142(30)

\\ \sf\Rrightarrow F=4260N

7 0
3 years ago
10 points
enot [183]

Answer:

B

Explanation:

I just took the test

8 0
3 years ago
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