Power is defined as the rate at which work is done or energy is transferred.

Fourier's Law of Heat Conduction states that the rate of heat transfer by conduction is directly proportional to the area and the temperature gradient.

The rate of heat transfer by conduction is directly proportional to the temperature difference between the two ends.

If A's age is 12, then B's age = (4/3) * 12 = 16 years.

Let the age of B be 5x. Since A's age is 4x = 20, x = 5. Therefore, B's age = 5 * 5 = 25.

Let B's age be 5x. Since A's age is 4x = 20, x = 5. Therefore, B's age = 5 * 5 = 25.

Let the ages be 3x and 4x. Then, 3x + 4x = 56 => 7x = 56 => x = 8. Older friend's age = 4x = 32.

Let the shorter side be 3x and the longer side be 4x. Given 4x = 32, x = 8. Therefore, the shorter side = 3x = 3*8 = 24.

Let the sides be 3x and 4x. Then, 3x + 4x + base = 70. Assuming base = 0, 7x = 70, x = 10. Longer side = 4x = 40.

If the shorter side is 16 cm and the ratio is 4:5, then the longer side can be calculated as (5/4) * 16 cm = 20 cm.

Let apples = 2x and oranges = 3x. Given 3x = 30, x = 10. Therefore, apples = 2x = 2*10 = 20.

Let apples = 5x and oranges = 3x. Given 5x = 40, x = 8. Therefore, oranges = 3x = 3*8 = 24.

The ratio of cats to dogs is 4:3. If there are 28 cats, we can set up the proportion: 4/3 = 28/x. Solving for x gives us x = 21. Therefore, there are 21 dogs.

Let students in class 1 = 2x and class 2 = 3x. Then, 2x + 3x = 60, 5x = 60, x = 12. Larger class = 3x = 3*12 = 36.

Speed of faster car = 180/2 = 90 km/h. Speed of slower car = (2/3)*90 = 60 km/h. Distance = speed * time = 60*2 = 120 km.

Let the speeds be 3x and 4x. Given 4x = 60 km/h, x = 15. Therefore, slower car's speed = 3x = 3*15 = 45 km/h. Distance = speed * time = 45 * 2 = 90 km.

Let the speed of the first car be 3x and the second car be 4x. The distance traveled is proportional to speed. Therefore, if 3x = 120, then 4x = (4/3)*120 = 160.

The real part of z = 4 - 3i is 4.

The study suggests a correlation between green spaces and lower pollution levels, implying that increasing green spaces could help reduce pollution.

The context suggests a negative impact on relationships, making 'complicate' the most fitting choice.

The statement indicates a correlation between increased screen time and anxiety rates, but does not imply causation or that all teenagers are affected.

Changing to active voice, we say 'The employee submitted the report.' emphasizing the employee's action.

The context implies that better sleep leads to better cognitive performance, which is a 'positive' outcome.

The phrase 'early intervention' typically implies positive long-term effects, making option 2 the most appropriate completion.

Groundbreaking findings typically challenge or contradict existing theories rather than reinforce or validate them.

The word 'innovative' indicates that the findings offer fresh insights, contrasting with the other options.

The term 'tentative' implies that the findings are not yet fully confirmed, which is appropriate in a research context.

The term 'preliminary' indicates that the findings are initial and not yet final, requiring more research.

The context suggests that the argument is strong and persuasive, making 'compelling' the best choice.

The word 'interdisciplinary' indicates a broad and inclusive approach, which is beneficial for tackling complex problems.