The mass of 1000 cm3 of water is a kilogram
a. true
b. false
Answer: a. true
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For a white dwarf to explode entirely as a Type I supernova, its mass must be:
A) at least 0.08 solar masses. B) 1.4 solar masses, the Chandrasekhar Limit. C) 3 solar masses, the Schwartzschild Limit. D) 20 solar masses, the Hubble Limit. E) 100 solar masses, the most massive known stars.
Suppose you find a rock that contains 10 micrograms of radioactive potassium-40, which has a half-life of 1. 25 billion years
By measuring the amount of its decay product (argon-40 ) present in the rock, you conclude that there must have been 80 micrograms of potassium-40 when the rock solidified. How old is the rock? A) 1.25 billion years B) 2.5 billion years C) 3.75 billion years D) 5.0 billion years
An electromagnetic wave is propagating towards the west in free space. At a certain moment the direction of the magnetic field vector associated with this wave points vertically upward. What is the direction of the electric field vector?
A) horizontal and pointing south B) vertical and pointing down C) horizontal and pointing north D) vertical and pointing upward E) horizontal and pointing east
As Earth _______________ on its axis, it produces the cycle of day and night
Fill in the blank(s) with correct word