What occurs when vibrations traveling through an object match the object’s natural frequency?
a. reflection
b. refraction
c. diffraction
d. resonance

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

Which best describes how fluids change as they travel through different portions of the convection currents? they change to solids at the outer portion of the convection currents. they change to solids at the inner portion of the convection currents. they become more dense at the outer portion of the convection currents. they become more dense at the inner portion of the convection currents

The photo shows sugar dissolved into a solution with excess sugar at the bottom of the jar this type of solution is classified as a. unsaturated b. compound c. saturated d. plasma