T The earth is built up and torn down in many ways. Physical and chemical weathering
are processes which are very important in making soil. Which statement accurately
describes an example of chemical weathering?
O Sinkholes are formed in Florida as water dissolves underground limestone rocks.
In order for rock to become metamorphic rock, it must be heated and extreme pressure
applied.
O In Alaska, rocks are broken due to continuous freezing and thawing of water sitting in cracks.
Beautiful and strange rocks, shaped by blowing sand, dot the Western United States
landscape

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

Aparticle of mass m is projected with an initial velocity v0 in a direction making an angle α with the horizontal level ground as shown in the figure. the motion of the particle occurs under a uniform gravitational field g pointing downward. (a) write down the lagrangian of the system by using the cartesian coordinates (x, y). (b) is there any cyclic coordinate(s). if so, interpret it (them) physically. (c) find the euler-lagrange equations. find at least one constant of motion. (d) solve the differential equation in part (c) and obtain x and y coordinates of the projectile as a function of time. (e) construct the hamiltonian of the system, h, and write down the hamilton’s equations (canonical equations) of motion.

From 0 to 5 seconds john pushed a box 5 meters. from 5 to 10 seconds, paul pushed the same box another 5 meters. who did more work? a. john b. paul c. john and paul did the same amount of work.