Achild lifts a box from the floor. the child then carries the box with constant speed to the other side of the room and puts the box down. how much work does he do on the box while walking across the floor at a constant speed?

Zero

Explanation:

Given child moves the box with constant velocity over his head .

Force acting on box due to gravity is equal to his weight

Displacement of the box is Perpendicular to the direction of Applied force

Work done is given by

here is the angle between Force and displacement which is

so work done is zero

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

answer: d. a cme increases the amount of energy in the solar wind

explanation:

coronal mass ejections, also called cmes, are large clouds of plasma and magnetic field that erupt from the sun. only when the cloud is aimed at earth will the cme hit earth and therefore cause impacts. high-speed solar wind streams come from areas on the sun known as coronal holes.