The theory of seafloor spreading was proposed in 1960 by
a. Alfred Wegener.
b. Harry Hess.
c. Albert Einstein.
d. Andrija Mohorovicic.
b
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An 825-kg space vehicle is circling Earth in a circular orbit with a radius of 10,300 km
Its orbit is to be changed to a larger circle with a radius of 17,400 km. How much energy is required to accomplish this? The mass of Earth is 5.97 × 1024 kg and G = 6.67 x 10-11 N•m2/kg2. A) 1.00 × 109 J B) 1.30 × 1010 J C) 6.51 × 109 J D) 4.45 × 109 J E) 4.50 × 1010 J
The energy gap between the valence and conduction bands in a certain semiconductor is 1.25 eV
What is the threshold wavelength for optical absorption in this substance? (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s) A) 959 nm B) 873 nm C) 994 nm D) 599 nm E) 639 nm
As you found in Part A, early Mars had both core convection and a strong magnetosphere. What is the connection between these two things?
a. Both core convection and a magnetosphere can exist only a very young planet. b. Core convection creates volcanism and outgassing, the gas creates the magnetosphere. c. Core convection helps generate a magnetic field, and the magnetic field creates the magnetosphere. d. Both core convection and a magnetosphere are consequences of a strong greenhouse effect.
What is the effect of grounding an (uninsulated) electrically charged conducting object?
a. The charge increases as the object gains charge from the earth, or ground. b. The charge dissipates into the ground. c. The ground controls the intensity. d. The object no longer acts as a conductor. e. The charge decreases but does not disappear, because the ground can only take some of it.