Human skin is almost a perfect blackbody, with an emissivity.r of approximately 0.93. HOW much thermal power is radiated by a person covered by 1.9 square metres of skin, at a surface temperature of 35.5 degrees Celsius? How many moles are there in 1.2 kg of ethanol? [Mass of a hydrogen atom = 1.00794 u. Mass of an oxygen atom = 15.9994 u. Mass of a carbon atom is 12.011 u].Ari escaped helium balloon, initially at a temperature of1?.9 degrees Celsius: experiences a pressure drop from from 568000 Pate 555000 Pa as it rises into the atmosphere. Assuming it maintains its volume of 13.5 litres, by how much {in SI units} does the helium temperature change? K v A force of 1.5 N is used to stretch a helical spring by a distance of 14.0 cm. Calculate the spring constant.In the future an astronaut carries out an experiment on the sun'ace of an exoplanet to measure the density of the planet. She hangs an object of mass 0.20 Kg on the end of a vertically hanging helical spring which has a spring constant of 15.2 Him. The spring extends by 15.0 cm. The radius of the planet is T.33E+UE m. {a} Calculate the magnitude of g, the acceleration due to gravity on the exoplanet. select units v (d) Determine the mass ofthe planet. select units v (c) Calculate the density.r of the planet. An object attached to the end of a vertical helical spring bounces with a frequency of 0.9 Hz. If the spring constant is 10.0 N/m, what is the mass of the object?What is the period of a simple pendulum with a length of 35 em, and a "pep" mass pf125 g