A140-lb man carries a 25-lb can of paint up a helical staircase that encircles a silo with radius 30 ft. if the silo is 120 ft high and the man makes exactly three complete revolutions, how much work is done by the man against gravity in climbing to the top?

What type of nuclear decay causes the atomic number of an element to increase by 1?

Light that is polarized along the vertical direction is incident on a sheet of polarizing material. only 96% of the intensity of the light passes through the sheet and strikes a second sheet of polarizing material. no light passes through the second sheet. what angle does the transmission axis of the second sheet make with the vertical?

Afeather of mass 0.001 kg falls from a height of 2 m. under realistic conditions, it experiences air resistance. based on what you know about friction, what can you say about the kinetic energy of the feather as it reaches the ground? acceleration due to gravity is g = 9.8 m/s2. a. ke < 0.0196 j b. ke = 00196 j c. je = 0 j d. ke > 0.0196 j