Acompact disc rotates from rest up to an anqular speed of 32.8 rad/s in a time of 0.862 s. (a) what is the angular acceleration of the disc, assuming the angular acceleration is uniform? rad/s2 (b) through what angle does the disc turn while coming up to speed? rad (c) if the radius of the disc is 4.45 cm, find the tangential speed of a microbe riding on the rim of the disc. m/s (d) what is the magnitude of the tangential acceleration of the microbe at the given time? use the values from practice it to you work this exercise. (a) what are the angular speed and angular displacement of the disc 0.250 s after it begins to rotate? rad/s a0 rad (b) find the tangential speed at the rim at this time. m/s

Groups of organs that work together to complete a process in the body are called: a. cells b. tissues c. nerves d. systems

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

Boxing gloves are padded to lessen the force of a blow. (a) calculate the force exerted by a boxing glove on an opponent’s face, if the glove and face compress 7.50 cm during a blow in which the 7.00-kg arm and glove are brought to rest from an initial speed of 10.0 m/s. (b) calculate the force exerted by an identical blow in the gory old days when no gloves were used and the knuckles and face would compress only 2.00 cm. (c) discuss the magnitude of the force with glove on. does it seem high enough to cause damage even though it is lower than the force with no glove?