Abox of tools weighing 20 lb is to be lifted (occasionally—maybe twice per day) from the floor to a cart that is 46 in. high. (no control is required at the destination.) the handle of the box is 10 in. high (i. e., the handle is located 10 in. from the floor). due to the width of the box, the worker must reach 24 in. in front of his or her ankles to grasp the handle, but does not need to twist.

(a) how would you rate the coupling type (good/fair/poor)? justify your answer.
(b) fill in a niosh lifting table and compute an rwl.
(c) what is the lifting index?
(d) how would the preceding analysis change if the lifting was done with one hand?

The lights used by mark watley (played by matt damon) during the film the martian seem to be metal halide lamps. metal halide lamps are filled with vaporized mercury and metal-halogen compounds. when an electric current is passed through the lamp, the tube begins to glow a bright white/blue color. if you were to pass this light through a prism to separate the individual light frequencies, you would see a rainbow just as you would if using natural sunlight because of the complexity of the metal halide gas and the vast amount of possible electron transitions. (the study of light in this way is known as spectroscopy and allows astronomers to know exactly what atoms compose distant stars, simply by looking at the light they emit. the spectral lines an atom produces uniquely identifies that atom just like a fingerprint uniquely identifies a person. the momentum equation and energy equation that we have used above can be combined to give the following equation: c = e p where again p is the phonon momentum, e is the photon energy and c is the speed of light. when you divide the photon energy found in #6 by the photon momentum found in #4, do you get the speed of light? (if not, check your work for questions #4 through #6). yes no

The transfer of heat through the movement of a gas or liquid a. convection b. conduction c. radiation

Choose all the answers that apply. our solar system: is in a spiral galaxy no longer includes pluto is made mostly of empty space is in the andromeda galaxy is the only known system that supports life