Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 1.10 m/s; (b) he is then lifted at the constant speed of 1.10 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage?
Answers: 1
Another question on Physics
Physics, 22.06.2019 16:50
Consider the growth of a 20-nm-diameter silicon nanowire onto a silicon wafer. the temperature of the wafer surface is maintained at 2400 k. assume the thermal conductivity of the silicon nanowire is 20 wm-1k-1 and all its surfaces including the tip are subjected to convection heat transfer with the coefficient h = 1×105 wm-2k-1 and t∞ = 8000 k. when the nanowire grows to l = 300 nm, what is the temperature of the nanowire tip (t (x =
Answers: 1
Physics, 22.06.2019 21:00
Give me a example of a decomposer. explain what would happen if decomposers were absent from a forest ecosystem
Answers: 1
Physics, 23.06.2019 12:00
When thorium (90 protons) ejects a beta particle, the resulting nucleus has question 18 options: 87 protons. 88 protons. 89 protons. 90 protons. none of the above
Answers: 1
You know the right answer?
Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a mot...
Questions
Biology, 10.07.2019 23:50
Biology, 10.07.2019 23:50
Mathematics, 10.07.2019 23:50
Biology, 10.07.2019 23:50
