Anegative charge of -0.550 μc exerts an upward 0.900-n force on an unknown charge that is located 0.300 m directly below the first charge. part a what is the value of the unknown charge (magnitude and sign)? express your answer with the appropriate units.

Power can be defined as a. the distance over which work was done. b. how much work can be done in a given time. c. all the work in an given area. d. the energy required to do work.

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

Gather reliable information to brent make his decision. to gather this information, use newspapers, call insurance companies or look at their web sites, and review consumer magazines and web sites. also, look at the manufacturer web site or for information about gas mileage. list the sources you use and take notes.