As the ball is going upwards, the velocity points __________ and the acceleration points __________
Fill in the blank(s) with correct word
up, down
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The number of protons in a neutral atom is
A) called the mass number. B) zero. C) the same for all elements. D) equal to the number of electrons. E) equal to the number of neutrons.
In the Bergeron process, condensation occurs on ______________
Fill in the blank(s) with correct word
A white dwarf will radiate its heat into space and become a black dwarf after a few ____
a. thousands of years b. millions of years c. hundreds of millions of years d. billions of years e. hundreds of billions of years
The separation of the strong force and the electroweak force ____
a. provided the energy for a rapid inflation of the early Universe b. created the cosmic microwave background radiation c. balanced the critical density of the Universe to solve the flatness problem d. created dark matter e. created dark energy