V. Answer the following questions. A metal block weighs 500 gf in air and 460 gf when completely immersed
water. Calculate the upthrust on the block.
Give reasons for the following:
(1) Cutting is easier with sharp tools.
(ii) Sometimes, people bleed from nose while climbing uphill rapidly.
(iii) A body weighs less inside water.
(iv) A balloon filled with hydrogen rises up only to a certain height.

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.

there are no components of a physical goal mentioned on the list of choices that you've provided.

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.