Aconcave mirror forms the image of a very distant object at 18.0 cm on the same side of its reflecting surface. what is the focal length of this mirror? (a) + 36.0 cm (b) + 18.0 cm (c) - 18.0 cm (d) - 36.0 cm

If forces acting on an object are unbalanced. true or false

In order of decreasing light-transmitting capabilities of materials, which is the correct sequence? a. transparent -> translucent -> opaque b. opaque -> transparent -> translucent c. opaque -> translucent -> transparent d. translucent -> transparent -> opaque

Select all the correct answers. which changes will increase the rate of reaction during combustion? decreasing the area of contact between the reactants adding more oxygen to the reaction removing heat from the reaction changing the reactants from solid form to powdered form lowering the exposure of the reactants to air