Mars appears from Earth to go through all the phases like Venus
Indicate whether the statement is true or false
FALSE
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Two small charged objects repel each other with a force F when separated by a distance d. If the charge on each object is reduced to one-fourth of its original value and the distance between them is reduced to d/2 the force becomes:
A) F/16 B) F/8 C) F/4 D) F/2 E) F
The time a protostar takes to contract from a cool interstellar gas cloud to a main-sequence star depends on its _____
A) volume B) luminosity C) mass D) temperature
An empty jar is pushed open-side downward into water so that trapped air cannot escape. As it is pushed deeper, the buoyant force on the jar
A) increases. B) decreases. C) increases, then decreases. D) decreases, then increases. E) remains the same.
What does it take to allow us to observe a neutron star as a pulsar?
What will be an ideal response?