A 220 N trunk rests on the floor. The coefficient of static friction between the trunk and the floor is 0.41, while the coefficient of kinetic friction is 0.32. (a) Calculate the minimum horizontal force with which a person must push on the trunk to start it moving. (b) Once moving, calculate the horizontal force the person must apply to keep the trunk moving with constant velocity. (c) If the person continued to push with the force used to start the motion, calculate the acceleration of the trunk.

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.