How can a large asteroid impact in one spot on Earth affect the climate of the entire Earth?
A) The impact releases greenhouse gases that immediately make Earth warmer.
B) The impact blasts a hole through Earth's mantle, allowing hot metal from the core to rise up and heat the world.
C) The impact blasts debris into Earth's atmosphere that blocks sunlight, making Earth's surface cooler.
D) The impact tears a hole in Earth's atmosphere, allowing heat energy to escape and thereby cooling our planet.
C) The impact blasts debris into Earth's atmosphere that blocks sunlight, making Earth's surface cooler.
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The following force vectors act on an object: i) 50.0 newtons at 45.0 degree north of east and ii) 25.0 newtons at 30.0 degree south of east. Which of the following represents the magnitude of the resultant and its angle relative to the easterly direction?
Eta Carinae is an example of a:
A) black hole. B) supermassive star. C) red dwarf. D) nebula. E) stellar nursery.
A point charge Q is placed on the x axis at the origin. An identical point charge is placed on the x axis at x = ?1.0 m and another at x = +1.0 m. If Q = 40 ?C, what is the magnitude of the electrostatic force on the charge at x = +1.0 m?
A. 29 N B. 14 N C. 11 N D. 18 N E. 7.0 N
For the multiplication of 6.3 m divided by 2.8 m, the result should be reported with how many significant figures?
a. Two b. One c. Three d. Four e. Seven