Can the gravitational force of Earth do positive or negative work on a geosynchronous communication satellite, once it is on its circular orbit?
A. Yes, because centripetal forces always do positive work
B. Yes, because its speed is constant
C. No, because the satellite has zero acceleration
D. No, because the force is always perpendicular to the orbital path
Answer: D
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The seven days of the week are related to the
A) Sun, Moon and five naked eye planets B) seven brightest stars in the sky C) seven planets known at the end of the 19th century D) seven most prominent constellations that the Sun, Moon and planets pass through
How is the greenhouse effect on Venus different to the same effect on Earth?
What will be an ideal response?
In a vacuum, all electromagnetic waves travel at the same speed
Indicate whether the statement is true or false