Sunidhi made a study chart about changes in states of matter.

Which headings best complete the chart?

X

melting

sublimation

Y

freezing

deposition

X: Solid Directly to Liquid

Y: Liquid Directly to Solid

OX: Liquid Directly to Solid

Y: Solid Directly to Liquid

O X: Heat Is Released

Y: Heat Is Absorbed

X: Heat Is Absorbed

Y: Heat Is Released

Why do electron microscopes have higher resolving power than light microscopes?

Awater slide of length l has a vertical drop of h. abby's mass is m. an average friction force of magnitude f opposes her motion. she starts down the slide at initial speed vi. use work-energy ideas to develop an expression for her speed at the bottom of the slide. then evaluate your result using unit analysis and limiting case analysis. express your answer in terms of the variables h, m, l, vi, f and appropriate constants. vf v f

Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants