What does the term milankovitch cycles most closely relate to?
a. changes in the seasons over many years
b. regular eruptions of volcanoes that cool earth
c. periodic changes in earth's orbit and angle of tilt relative to the sun
d. the cyclic motion of the continents to form large landmasses which affect earth's climate

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

If a negatively charged particle is placed at rest in an electric potential field that increases in the positive x-direction, what will the particle do? a. accelerate in the positive x-direction b. remain at rest c. accelerate in the negative x-direction

Current from a charged capacitor lights a bulb. as time goes on the brightness of the