Describe and sketch how magma is generated in a subduction zone.
Our global climate is changing. There are many contributing factors to this change. One often ignored factor is soot: black and brown particles emitted by burning fossil fuel-diesel, coal, gasoline, and jet fuel-and from burning solid biofuels-wood, manure, and dung (used for heating homes and cooking in many locations). Just like wearing a black shirt on a sunny day, soot in the atmosphere absorbs solar radiation-heating the surrounding air. It also absorbs light reflecting off Earth’s surface-a double whammy for further warming. Unlike CO2, which lingers in the atmosphere for decades, soot lingers for only a few weeks before being washed out. So, reducing soot emissions can be very helpful in slowing the trend toward global warming. How can soot emission be reduced?
A rectangular bar that is straight and unstressed is bent into an arc of circle of radius ρ by two couples of moment M. After the couples are removed, it is observed that the radius of curvature of the bar is
ρR.ρ_R. ρR.
Denoting by
ργρ_γ ργ
the radius of curvature of the bar at the onset of yield, show that the radii of curvature satisfy the following relation:
1/ρR=(1/ρ)(1−(3/2)(ρ/ργ)[1−(1/3)(ρ/ργ)2])1/ρ_R = (1/ρ)(1 - (3/2) (ρ/ρ_γ) [1 - (1/3)(ρ/ρ_γ)^2]) 1/ρR=(1/ρ)(1−(3/2)(ρ/ργ)[1−(1/3)(ρ/ργ)2])
Determine the volume of a rectangular solid whose width is 3 inches, length is 12 inches, and height is 1 inch.
