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Rom4ik [11]
3 years ago
6

involves removing the top layer of earth, mining the coal, and then replacing the earth back on the surface.

Physics
1 answer:
noname [10]3 years ago
7 0
What is strip mining?

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How much would a 70.0-kg person weigh on Mercury?
Natalija [7]

As weight =w =mg

g= gravitational acceleration on mercury = 3.7m/sec2

Mass of person =m= 70 kg

So w =(70kg)(3.7m/sec2)

w= 259 kgm/sec2

W= 259 N

6 0
3 years ago
Which of the following best describes Earth's crust, according to the theory of plate tectonics?
FrozenT [24]

Answer:

the Earth's crust is broken into about 12 plates that float on hotter, softer rocks in the underlying mantle

Explanation:

8 0
3 years ago
A cart of mass 6.0 kg moves with a speed of 3.0 m/s towards a second stationary cart with a mass of 3.0 kg. The carts move on a
IgorLugansk [536]

Answer:1.5

Explanation:

Given

mass of first  cart m_1=6 kg

initial Velocity u_1=3 m/s

mass of second cart m_2=3 kg

u_2=0 m/s

In the absence of External Force we can conserve momentum

m_1u_1+m_2u_2=(m_1+m_2)v

v=\frac{m_1u_1+m_2u_2}{m_1+m_2}

v=\frac{6\times 3+3\times 0}{6+3}

v=2 m/s

Final kinetic Energy of two masses

K.E._2=\frac{1}{2}(m_1+m_2)v^2

K.E._2=\frac{1}{2}\cdot (3+6)\cdot (2)^2

K.E._2=18 J

Initial Kinetic Energy

K.E._1=\frac{1}{2}m_1u_1^2+\frac{1}{2}m_2u_2^2

K.E._1=\frac{1}{2}6\times 3^2+0

K.E._1=27 J

ratio =\frac{K.E._1}{K.E._2}=\frac{27}{18}=1.5

5 0
3 years ago
In order to increase the speed in a gear system
Ludmilka [50]

Answer:

the driving gear must be larger than the driven gear

Explanation:

6 0
3 years ago
What is the shortest path that the paper can take to return to Owen's desk? The paper cannot move diagonally.
Vera_Pavlovna [14]

Answer:

to jamal then luis then to eva then back to owen

8 0
3 years ago
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