Prevents movement by external forces ___Decelerates movement ___Causes the body part to move against gravity or external forces ___Joint angle changes in the direction of the applied muscle force ___Muscle gradually lessens in tension to control the descent of resistance ___ Accelerates movement ___Muscle force < resistance ___Muscle tension acts to maintain joint angle in stable position ___Muscle develops enough force to overcome applied resistance or gravity ___Joint angle changes in the direction of the resistance or external force ___Muscle force > resistance

Which of the following represents an upright image? a. -do b. +m c. -m d. +do

Consider the particle-in-a-box problem in 1d. a particle with mass m is confined to move freely between two hard walls situated at x = 0 and x = l. the potential energy function is given as (a) describe the boundary conditions that must be satisfied by the wavefunctions ψ(x) (such as energy eigenfunctions). (b) solve the schr¨odinger’s equation and by using the boundary conditions of part (a) find all energy eigenfunctions, ψn(x), and the corresponding energies, en. (c) what are the allowed values of the quantum number n above? how did you decide on that? (d) what is the de broglie wavelength for the ground state? (e) sketch a plot of the lowest 3 levels’ wavefunctions (ψn(x) vs x). don’t forget to mark the positions of the walls on the graphs. (f) in a transition between the energy levels above, which transition produces the longest wavelength λ for the emitted photon? what is the corresponding wavele

Emagnitude of the electrical force acting between a +2.4 ×  10–8  c charge and a +1.8 ×  10–6  c charge that are separated by 0.008 m is    n, rounded to the tenths place.