A diverging mirror has a focal length of -20 cm. An object is placed (i) 10 cm, and (ii) 30 cm from the mirror. (-6.7 cm, -12 cm)

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?

How do we measure or think of speed in the united states?

Consider a small frictionless puck perched at the top of a fixed sphere of radius r. if the puck is given a tiny nudge so that it begins to slide down, through what vertical height will it descend before it leaves the surface of the sphere? [hint: use conservation of energy to find the puck's speed as a func e conservation of energy to find the puck's speed as a function of its height at what value of this normal force does the puck leave the sphere? ] here on the puck.