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3 years ago

Many extrusive volcanic rocks contain holes which have formed from:

2 answers:

8 0

<span>"escaping gases" would be the correct answer.

These gases would be trapped in the lava, and would bubble and pop as they escaped.</span>

frez [133]3 years ago

8 0

B or escaping gases would be the answer

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For an object at rest, the normal force equals the gravitational force. What is the sum of these forces called?

Thepotemich [5.8K]

The sum of all forces on an object is called the "net" force on it.

For an object at rest, we call that sum of forces "zero".

8 0

3 years ago

Read 2 more answers

Imagine that you pushed a box, applying a force of 60 newtons, over a distance of 4 meters. How much would you have done?

grin007 [14]

You would have done 240 joules of work on the box.

Work = (force) x (distance)

= (60 newtons) x (4 meters)

= 240 joules .

5 0

3 years ago

Which two statements offer evidence that the clocks energy is conserved?

Natali [406]

Answer:

C is the best answer because we all know that clock is part of our daily lives but we don't know the about its background

3 0

3 years ago

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Rubbing your hands together warms them by converting work into thermal energy. If a woman rubs her hands back and forth for a to

KATRIN_1 [288]

Answer:

0.178 °C

Explanation:

Given:

The frictional force, F = 48 N

Number of rubs, n = 18

Distance covered per rub, d = 7.16 cm = 0.0716 m

Total distance covered in 18 rubs, D = 0.0716 × 18 = 1.288 m

mass of the tissues warmed, m = 0.1 kg

Now,

Work done, W = Force × Displacement

W = 48 × 1.288 = 61.8624 J

Now,

Work done is the change in heat

W = ΔQ = 61.8624 J

also,

ΔQ = mCΔT

where, C is the specific heat

for human tissue, C = 3470 J/kg°C

thus,

61.8624 J = 0.1 × 3470 × ΔT

ΔT = 0.178 °C

Hence, the change in temperature is 0.178 °C

6 0

4 years ago

According to the Second Law of Thermodynamics, a. any process during which the entropy of the universe increases will be product

Iteru [2.4K]

Answer:

The correct option is;

a. Any process in which the entropy of the universe increases will be product-favored

Explanation:

According to the second law of thermodynamics, the change in entropy of a closed system with time is always positive. That is the entropy of the entire universe, considered as an isolated system, always increases with time, hence the entropy change in the universe will always be positive.

$\Delta S_{universe} = \Delta S_{system} + \Delta S_{surroundings} >0$

Therefore, any process in which the entropy of the universe increases will be product favored.

4 0

3 years ago