From a particular location on Earth, why can we see many more total eclipses of the Moon than total eclipses of the Sun?
What will be an ideal response?
A total lunar eclipse is visible over a much larger part of the Earth's surface than a total solar eclipse.
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Asteroid Ida was photographed by the Galileo spacecraft in 1993, and the photograph revealed that the asteroid has a moon, which has been named Dactyl
From the dimensions of Ida and its general features, one can estimate the mass of Ida to be 4.5 × 1016 kg, and the distance between Dactyl and Ida is approximately 90 km. Assuming a circular orbit, what would be the orbital speed of Dactyl? G = 6.67 x 10-11 N•m2/kg2. A) 5.8 m/s B) 11 m/s C) 2.3 m/s D) 2.9 m/s E) 30 m/s
Geologists think that Earth is how old?
a. 4560 billion years b. 45.6 thousand years c. 45.6 million years d. 4.56 billion years
Calorimetry: A person makes iced tea by adding ice to 1.8 kg of hot tea, initially at 80°C. How many kilograms of ice, initially at 0°C, are required to bring the mixture to 10°C? The specific heat of water (and tea) is 4186 J/kg ? K, and the latent heat of fusion of ice is 3.34 × 105 J/kg.
A. 1.0 kg B. 1.2 kg C. 1.4 kg D. 1.7 kg
The data points on this graph represent the measured spectrum of the cosmic microwave background, while the solid curve represents a theoretically calculated thermal radiation spectrum for a temperature of 2.73 K. What is the significance of the near-perfect match between the data and the theoretical spectrum?
A) It shows that the cosmic microwave background has a thermal radiation spectrum, just as the Big Bang theory predicts it should. B) It shows that all objects in the universe emit thermal radiation. C) It tells us the average temperature of gas in the Milky Way Galaxy. D) It demonstrates that the universe must contain more dark matter than ordinary matter.