In special relativity, we learned that people in different reference frames will measure time differently. According to general relativity, why does this happen?
A) They are experiencing the same spacetime reality, but from different perspectives.
B) People in different reference frames experience different realities.
C) It is an illusion, and time really is the same for everyone.
D) They have different worldlines.
A) They are experiencing the same spacetime reality, but from different perspectives.
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The figure above shows the geological time scale of Earth. Animals have been present on land for approximately ________ of the Earth's history.
A) 1/10 B) 1/4 C) 1/2 D) 3/4
Which of the following statements best reflects our current knowledge about the term flife in the equation Number of Civilizations = Np × flife × fcivilization × fnow?
A) The value of flife must be either 0 percent or 100 percent. B) The value of flife is between 0 percent and 100 percent. C) The value of flife is between 0 percent and 1 percent. D) The value of flife is roughly 50 percent. E) The value of flife is presently unknown but should be well known within just a few years.
It is generally easier to push an object once it is moving than when you are getting it started. This is because
a. sliding friction is zero. b. sliding friction is less than static friction. c. static friction is less than sliding friction. d. static friction is zero.
A 10-g bullet moving horizontally with a speed of 2.0 km/s strikes and passes through a 4.0-kg block moving with a speed of 4.2 m/s in the opposite direction on a horizontal frictionless surface. If the block is brought to rest by the collision, what is the kinetic energy of the bullet as it emerges from the block?
a. 0.51 kJ b. 0.29 kJ c. 0.80 kJ d. 0.13 kJ e. 20 kJ