Physics, 26.03.2020 22:01 ordonez9029
Technological advances had helped reveal that the ocean floor was not flat, as once believed, but instead was marked by 50,000-kilometer-long, 3,000-meter-high ridges and 11-kilometer-deep trenches. How do scientists explain why, if new crust is constantly being formed from volcanic materials at the ridges, Earth's crust stays the same size?
A) Seafloor spreading is the cause of new crust being added. Old crust crumbles and forms mountains throughout the Earth's surface. Mountains keep growing.
B) Scientists hypothesize that new crust is the result of volcanic activity throughout the Earth's surface and older magma is destroyed as it subducts during earthquakes into Earth's mantle.
C) Scientists found that the youngest oceanic crust is located nearest the mid-ocean ridge and divergent boundary and the oldest crust is at subduction zones where it sinks back into the Earth.
D) Scientists found that the oldest oceanic crust is located nearest the mid-ocean ridge and forms from volcanic activity;the youngest crust is nearest the trenches and it comes from magma flowing up to Earth's surface..
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Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.
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Abeverage can is made of 3004-h19 aluminum alloy (elastic modulus 69 gpa, tensile yield strength 285 mpa, density 2.72 g/cm^3). the dimensions on the can are approximated as a thin-walled cylinder with a height of 4.83 inches, diameter of 2.60 inches. empty the can has a mass of 14.2 g. determine: a. the wall thickness of the cylinder b. assuming a pinned-pinned condition what is the critical load? c. assuming a fixed-fixed condition what is the critical load?
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