Ship is made of steel (density > water) but hollow shape makes average density (including air) less than water. Displaced water weight equals ship's weight, buoyancy holds it up.
Explanation:
v_esc = √(2GM/R), independent of m. Heavier object needs more energy, but velocity same. All objects fall at same rate. Important concept.
Explanation:
Low Earth orbit (LEO) satellites (altitude ~200-2000 km) have orbital period ~90 minutes. ISS orbits in ~93 min. Geostationary orbit period 24 h. Moon 27 days. Kepler's third law applies.
Explanation:
Ammeter measures current, must be in series so full current flows through it. Low internal resistance to minimize voltage drop. Voltmeter measures potential difference, connected in parallel, high resistance.
No comments yet. Be the first to start the discussion!