Earth and the moon are kept in their respective orbits due to the influence of ?
a) inertia b) gravity c) both inertia and gravity d) neither inertia and gravity

What are similarities and differences of reflection, refraction, diffraction and absorption?

Ms. hidalgo opens the door to her classroom. her classroom is 60 degrees and the air outside is 80. predict what will happen using your knowledge of how heat flows.

On a day when the barometer reads 75.23 cm, a reaction vessel holds 250 ml of ideal gas at 20 celsius. an oil manometer ( ρ= 810 kg/m^3) reads the pressure in the vessel to be 41 cm of oil and below atmospheric pressure. what volume will the gas occupy under s. t.p.?