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2 years ago

Is a rock that cools quickly after lava rusted through a volcano what is the best description of its texture

Physics

2 answers:

umka21 [38]2 years ago

7 0

I think glass. Where does rust play a part of lava?

gavmur [86]2 years ago

3 0

The physical description would be soft due to the lava cooling the rock.

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2 years ago

A worker pushed a 25.0 kg block 6.50 m along a level floor at constant speed with a force directed 30.0° below the horizontal. I

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Answer:

a) 855.41J

b) 855.41J

Explanation:

The force equation is

N - mg - F sinθ = 0

N = mg + F sinθ

The frictonal force is =

$F_x = F cos \theta$

$U_xN = Fcos\theta$

substitute the value of the normal force in the above equation

$U_x (mg + Fsin\theta ) = F cos\theta$

$F = \frac{U_x mg}{cos\theta - U_x sin\theta } \\\\= \frac{0.41 \times 25 \times 9.8 }{cos 30^\circ- 0.41 \times sin30 ^\circ}$

= 151.96N

a) work done = F × d

= (151.96) × (6.5) cos30°

= 855.41 J

b) The increase in thermal energy of the block floor system will be equal to the work done by the worker

work done = F × d

= (151.96) × (6.5) cos30°

= 855.41 J

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2 years ago

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Answer:

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2 years ago

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