A 74.0 kg person climbs stairs, gaining 2.10 meters in height. Find the work done (in J) to accomplish this task

Acatapult is tested by roman legionnaires. they tabulate the results in a papyrus and 2000 years later the archaeological team reads (distances translated into modern units): range = 0.4 km; angle of launch = π/5 rad; landing height = launch height. what is the initial velocity of launch of the boulders if air resistance is negligible?

What is a carrier wave and how does it affect what you hear on the radio

Carbon 14 is a naturally occurring stable