To learn how to find internal forces for a statically indeterminate axially loaded structure by using deformation compatibility relationships and static equilibrium equations. a reinforced concrete pier supports a 350 kip axial compressive load as shown. the 12-in-diameter concrete pier is reinforced with 6 #8 (i. e., 1-in diameter) steel reinforcing bars (i. e., rebar). the steel and the concrete are assumed to be bonded together (i. e., there is no slip between them upon loading). the modulus of elasticity for the steel rebars is 29,000 ksi and the modulus of elasticity for the concrete is 4,200 ksi

2.77 x 10^-3 its for plato user 

The figure is missing but we can answer anyway.the correct answer is "releasing the string". in fact, when the person is holding the bow and the arrow, the kinetic energy of the arrow is still zero (because the arrow is not moving). the moment the arrow is released, it acquires a velocity v, so its kinetic energy will become different from zero: where m is the mass of the arrow and v its velocity.  all the other options, instead, do not increase the kinetic energy of the system: -  pulling farther back on the string : this will just increase the elastic potential energy of the system-  holding the arrow higher: this will increase the gravitational potential energy of the system (which is given by u=mgh, where h is the height above the ground)-  decreasing the mass of the arrow: this will decrease the gravitational potential energy of the system (which is given by u=mgh, where m is the mass)

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