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Dafna1 [17]
3 years ago
7

Suppose that marine scientists have collected data showing that oceans have become cooler in recent years. This decrease in temp

erature would reflect a decrease in thermal energy stored in the ocean. If true, would this result validate or invalidate the Law of Conservation of Energy? Why or why not?
SAT
1 answer:
GuDViN [60]3 years ago
3 0
Marine scientists have gathered information demonstrating that seas have turned out to be hotter as of late. This expansion in temperature would mirror an increment in warm vitality put away in the sea. It was negated in light of the fact that the measure of vitality ought to remain consistent.
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on the microscopic level, explain the concept of energy transfer as heat when a hand is placed in water that is 50 °c. body temp
Elina [12.6K]

Answer/Explanation:

Energy is transferred from a hotter object to a cooler object. This is largely because of the collision of the molecules of a hotter body with the molecules of a cooler body ultimately leading to a transfer of energy from the hotter body to the cooler body. This now makes the temperature of the cooler body to rise.

Remember that temperature is a measure of the average kinetic energy of the molecules in a body.

Therefore, since the water is at a higher temperature, energy is transferred from the water to the hand and the temperature of the hand rises accordingly.

When the temperature of an object increases, the average kinetic energy of its particles increases. When the average kinetic energy of its particles increases, the object's thermal energy increases. Therefore, the thermal energy of an object increases as its temperature increases.

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Answer:

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The picture below shows a right-triangle-shaped charging stand for a gaming system: the side face of a charging stand is a right
Kay [80]

The expression for the height of the stand is:

ac = 3in*tan(50°).

<h3>How to get the height of the charging stand?</h3>

We have the right triangle abc.

We know that:

  • c = 90°
  • b = 50°
  • bc = 3 inches.

We want to get the length of ac.

Notice that ac is the opposite cathetus to angle b, which measures 50°.

Then we can use the trigonometric relation:

tan(a) = (opposite cathetus)/(adjacent cathetus).

Then we will have:

tan(50°) = ac/bc

We can replace bc by its length:

tan(50°) = ac/3in

3in*tan(50°) = ac.

This is the expression for the height of the stand.

If you want to learn more about right triangles, you can read:

brainly.com/question/2217700

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2 years ago
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Two small metal cubes with masses 2. 0 g and 4. 0 g are tied together by a 5. 0-cm-long massless string and are at rest on a fri
Aleks04 [339]

The energy of the system, tension in the string, and speed of each cube are respectively; U = 0.72 J, T = 14 N and (V₂, V₄) = (-22, 14)

<h3>Calculation of energy and tension in a String</h3>

We are given;

Mass of cube 1; m₁ = 2 g

Mass of cube 2; m₂ = 4 g

Distance between cubes; d = 5 cm = 0.05 m

Charges of cubes; Q = q = +2. 0 μc = 2.0 × 10⁻⁶ C

A) Formula for the energy of the system is;

U = kQq/d

U = 8.99 × 10⁹ × (2.0 × 10⁻⁶ C)²/0.05 m

U = 0.03596/0.05

U = 0.72 J

B) Formula for the Tension is;

T = U/d

T = 0.72/0.05

T ≈ 14 N

C) Momentum is conserved, and as such the initial momentum is zero. Thus;

0 = (0.0020 × V₂) + (0.0040 × V₄)

⇒ V₂ = -2V₄

Energy is also conserved and so;

(½ × 0.0020 × (-2V₄)²) + (½ × 0.004 × (V₄)²) = 0.72 J

-0.0040V₄² + 0.002V₄² = 0.72 J

0.0060V₄² = 0.72 J

V₄² = 0.72/0.0060

V₄² = 120

V₄ = √120

V₄ ≈ 11 m/s

Recall that; V₂ = -2V₄

Thus;

V₂ = -2(11) m/s

V₂ = -22 m/s

Thus;

(V₂, V₄) = (-22, 14)

Read more about Conservation of Momentum at; brainly.com/question/7538238

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solniwko [45]

Answer: D

Explanation:

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