Aship is sailing in dense fog and it could be close to dangerous cliffs. the captain switches on the fog horn. the horn sounds and the echo is heard 4 seconds later. the speed of sound in air is 340 m/s. calculate the distance between the ship and the cliff

What type of electromagnetic wave is used in security pens? a. x-rays c. microwaves b. visible light d. ultraviolet radiation select the best answer from the choices provided

An object's buoyant force and weight mean the same thing.a. trueb. false

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.?