Ptolemy based his model on theories first developed by Plato, who believed each celestial body traveled around a small circle that followed a larger circle around Earth
a. True
b. False
Indicate whether the statement is true or false
False
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An electron of mass 9.11 × 10^–31 kg has a momentum of 2.06 × 10^–22 kg•m/s. What is its speed?
a. 0.800c b. 0.467c c. 0.602c d. It cannot have this momentum since it would require a speed greater than c.
During the time that latent heat is involved in a change of state:
A. the temperature does not change B. the substance always expands C. a chemical reaction takes place D. molecular activity remains constant E. kinetic energy changes into potential energy
Originally 2.00 mol of gas are at STP. If the temperature changes to 47.0°C and the pressure decreases to half of what it was, how many liters do the two moles now occupy? (1 atm = 101 kPa, R = 8.31 J/mol ? K)
What will be an ideal response?
How do we know that there is much more mass in the halo of our galaxy than in the disk?
A) There are so many globular clusters in the halo that their total mass is greater than the mass of stars in the disk. B) Stars and gas clouds in the outskirts of the Milky Way orbit the galaxy at much higher speeds than we would expect if all the mass were concentrated in the disk. C) We have discovered that the halo is filled with an enormous number of brown dwarfs that have a combined mass much greater than the disk. D) Laboratory experiments have proven that the halo must be full of subatomic dark matter particles.