A balloon filled with helium has a volume of 0.50 m³at 21ºC. Assuming the pressure and mass remain constant, what volume will the balloon occupy at 0ºC?

grav forces affect all objects magnetic forces affect magnetic objects and electric currents

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

hi,

what occurs during a solar eclipse?

there are small tides across earth.

the moon is between earth and the sun.

p.s. im not sure if the first answer is correct because during a solar ecliphse there are spring tides and i dont know if they are the same.

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.