A solar eclipse occurs on Earth when the
What will be an ideal response?
moon casts a shadow on Earth
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Fireworks go off at the same time according to Earth clocks in two cities, Alum and Boron, that are 300 km apart. The people in a spaceship that is flying in a straight line from Alum to Boron at 0.80c also observe the fireworks. Do they see the fireworks in the two cities simultaneously? If the people in the spaceship say the fireworks were not simultaneous in Alum and Boron, how long before or
after the fireworks flashed at Alum did the fireworks flash at Boron according to their calculations? (The spaceship is directly over Alum when the fireworks flash.) a. Yes; 0 b. Before; 1.0 × 10^?3 s c. After; 1.0 × 10^?3 s d. Before; 1.3 × 10^?3 s e. After; 1.3 × 10^?3 s
How was Pluto's surface mapped?
A) by mapping with the New Horizons spacecraft B) by measuring the change in brightness as Charon eclipsed Pluto C) by imaging with the Hubble Space Telescope D) by imaging with powerful ground based telescopes E) Pluto is too far away for its surface to be mapped.
The mass number (A) of a nuclide is equal to the number of ______________ in one of its nuclei
a. protons plus neutrons b. protons c. neutrons d. neutrons plus electrons
One hypothesis suggested to explain the uniform age of the surface of Venus is that
a. Venus' surface is 4 billion years old and has not been affected by flooding or slow evolution. b. Venus' surface is made of rocks that are much harder than Earth's and thus last longer. c. Venus periodically goes through a catastrophic melting of the entire surface. d. Venus' clouds protect it from meteorites so that very few impacts occur to change its surface. e. dust storms deposit large amount of dust on the surface making it appear of uniform age.