The difference in longitude is |20° - 10°| = 10°. The time difference is 10 * 4 = 40 minutes.

The total difference in degrees is 120 + 60 = 180 degrees. The time difference is 180/15 = 12 hours.

The total difference in degrees is 120° + 60° = 180°. 180° * 4 minutes = 720 minutes = 12 hours. The time difference is 12 hours.

Total difference = 120° + 60° = 180°. Time difference = 180°/15° = 12 hours.

The difference in degrees is 45° - 15° = 30°. Since each 15° represents 1 hour, the time difference is 30°/15° = 2 hours.

The total angular distance is 30° + 30° = 60°. The time difference is 60 / 15 = 4 hours.

The total difference is 45 + 45 = 90 degrees. Therefore, the time difference is 90/15 = 6 hours.

The total difference in degrees is 60° + 30° = 90°. Therefore, the time difference is 90° / 15° = 6 hours.

The total difference in longitude is 75 + 15 = 90 degrees. Therefore, the time difference is 90/15 = 6 hours.

The difference in longitude is 75 - 45 = 30 degrees. 30/15 = 2 hours.

The time difference is calculated as (90° - 30°) / 15° = 4 hours. Therefore, the answer is 4 hours.

Time period (T) = 2π/ω_n = 2π/10 = 0.2π ≈ 0.628 s.

Time period (T) = 2π/ω_n = 2π/3 rad/s = 2π/3.

The time period T of a simple pendulum is given by T = 2π√(L/g), where L is the length of the pendulum and g is the acceleration due to gravity.

The time period T is the reciprocal of frequency, T = 1/f. Thus, T = 1/20 Hz = 0.05 s.

The tone is serious as the author addresses the critical issue of economic inequality with gravity.

The passage adopts an enthusiastic tone, highlighting the numerous benefits of meditation.

The passage critically examines the negative effects of social media on genuine communication.

The tone of the passage is urgent and alarming, reflecting the seriousness of the climate change issue and the need for immediate action.

The tone is urgent, as the author stresses the need for immediate and decisive action from governments to combat climate change.

The author presents a cautiously optimistic view, acknowledging both the benefits and potential drawbacks of technological advancements.

The tone of the passage is cautious but hopeful, acknowledging challenges while emphasizing potential solutions.

The author maintains an optimistic tone, focusing on potential solutions and positive outcomes.

The author expresses a hopeful outlook on the advancements and potential of artificial intelligence, indicating optimism.

The author maintains an optimistic tone, suggesting that with collective effort, positive change is achievable in climate action.

The tone reflects a sense of urgency and concern, indicating a despairing outlook on the future of climate change, thus option 2 is correct.

The tone is pessimistic, reflecting concerns about the lack of effective action and the potential consequences of inaction.

The passage conveys an optimistic view about the potential for educational reform, making option B the correct choice.

The tone of the passage is optimistic, highlighting the potential of renewable energy sources to combat climate change and promote sustainability.

The author expresses an optimistic view about the potential of technology to improve lives.