Leptons are built out of quarks
Indicate whether the statement is true or false
F
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Earth's magnetic poles will eventually reverse. This shift will also cause the seasons to reverse.
Answer the following statement true (T) or false (F)
The apparent magnitude of the Sun is -26, while Sirius has an apparent magnitude of -1. How much brighter does the Sun appear than Sirius?
What will be an ideal response?
A 6.0-kg object, initially at rest in free space, "explodes" into three segments of equal mass. Two of these segments are observed to be moving with equal speeds of 20 m/s with an angle of 60° between their directions of motion. How much kinetic energy is released in this explosion?
a. 2.4 kJ b. 2.9 kJ c. 2.0 kJ d. 3.4 kJ e. 1.2 kJ
What are greenhouse gases?
A) gases that absorb visible light B) gases that absorb ultraviolet light C) gases that absorb infrared light D) gases that emit visible light E) gases that transmit infrared light