A quantity that has only a magnitude but no direction associated with it is called a __________
Fill in the blank(s) with correct word
scalar
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The stellar epoch, which we are still in today, began:
A) with the end of the quark epoch, when neutrons and protons fused into deuterium. B) with the end of the lepton epoch, when neutrinos were formed and escaped from matter. C) with the liberation of the dark energy. D) about 100 million years after the Big Bang, with the making of galaxies. E) about three billion years after the Big Bang, with Population I stars forming.
An electron moves in a region where the magnetic field is uniform and has a magnitude of 80 ?T. The electron follows a helical path which has a pitch of 9.0 mm and a radius of 2.0 mm. What is the speed of this electron as it moves in this region?
a. 48 km/s b. 28 km/s c. 20 km/s d. 35 km/s e. 8.0 km/s
Is the back side of the Moon always dark?
What will be an ideal response?
Why is thermal escape of atmospheric gas much easier from the Moon than from Earth?
A) because the Moon's gravity is so much weaker than Earth's B) because the Moon's average surface temperature is lower than Earth's C) because the Moon lacks a global magnetic field, while Earth has one D) Outgassing on the Moon releases gases with lower masses than does outgassing on Earth.