When we look at an object that is 1,000 light-years away, we see it ________
A) as it was 1,000 light-years ago
B) looking just the same as our ancestors would have seen it 1,000 years ago
C) as it is right now, but it appears 1,000 times dimmer
D) as it was 1,000 years ago
D
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An ideal transformer has an input voltage of 20,000 V and an output voltage of 260 V. If the input current is 26.0 A, what is the output current?
A. 1.70 A B. 10.0 A C. 100 A D. 200 A E. 2000 A
Earth's spin and its sideways velocity is due to the conservation of _____________________.
What will be an ideal response?
What is the difference between a synodic month and a sidereal month?
A) A synodic month is the time it takes for a cycle of lunar phases, and a sidereal month is the time it takes the Moon to orbit Earth (relative to the stars). B) A synodic month is our 30- or 31-day calendar month and a sidereal month is the time it takes for a cycle of the Moon's phases. C) A synodic month is the time it takes for a cycle of the Moon's phases and a sidereal month is our 30- or 31-day calendar month. D) A synodic month is based on the orbit of some planet around the Sun and a sidereal month is based on the orbit of the Moon around the Earth.
Briefly explain how antimatter can be produced on Earth.
What will be an ideal response?