What is the most abundant element for Earth as a whole?
What will be an ideal response?
Iron
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Why is the ozone layer in Earth's atmosphere important to life on its surface?
What will be an ideal response?
Power: A 150-W light bulb is designed to operate at 110 V dc. How much current does it draw?
A. 0.73 A B. 1.4 A C. 2.0 A D. 15 A
If the distance between two isolated parallel plates that are oppositely charged is doubled, the electric field between the plates is essentially unchanged. However, the:
a. charge on each plate will double. b. force on a charged particle halfway between the plates will get twice as small. c. potential difference between the plates will double. d. force on a charged particle halfway between the plates will get four times as small.
Which of the following statements about the Sun is an inference from a model, not an observation?
A) The photosphere emits visible light. B) The Sun emits neutrinos. C) The convection zone is cooler than the radiation zone. D) The corona is hotter than the photosphere.