What is the effect on the volume of a rectangular prism if the width is doubled and the hight is reduced to half of the original height? a) the volume is doubled. b) the volume is halved. c) the volume is tripled. d) the volume is unchanged.

The volume of a rectangular prism is given by: 
V = lwh
twice the length: 2l, twice the width: 2w , half the height 1/2h:  
The volume of new prism: 
2l*2w*1/2h 
Factor: 
2*2*1/2*l*w*h
So the volume is twice the original volume.
Thus the Answer is  A) the volume is doubled. 

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.