Find the length of the mercury column in a
simple barometer when the barometer is raised
from sea level to a height of 2.5 km given that
the average density of air is 1.2 kgm and the
density of mercury is 1.36 x 104 kgm.
Atmospheric pressure at sea level is 76 cm of
mercury

Apebble is thrown into a calm lake, ripples are formed from the center and move outward. the water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels a) diagonally. b) downward. c) horizontally. d) upward.

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

Your science teacher brings in a speaker to talk to your class about climate change. during the session, students ask a few questions. which questions are related to the current evidence on climate change