Atheory is a a. proposed explanation for an observation b. well-rested explanation for a broad set of observations. c. summary of the results of many observations. d. procedure used to test a proposed explanation.

How much force must a locomotive exert on a 12840-kg boxcar to make it accelerate forward at 0.490 m/s2?

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

Aspecimen of oil having an initial volume of 580cm^3 is subjected to a pressure increase of 4.0 mpa, and the volume is found to decrease by 0.40 cm^3. (a) what is the bulk modulus of the material? (b) what is the compressibility of the material?