An 845-n sled is pulled a distance of 186m. the task, Ask an Expert

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Q. An 845-N sled is pulled a distance of 186m. The task requires 1.2 multiplied by 104 J of work and is done by pulling on a rope with a force of 133-N. At what angle is the rope held?

Q. The threshold of dark-adapted (scotopic) vision is 4.0 x10-11 W/m2 at a central wavelength of 500nm. If light with this intensity and wavelength enters the eye when the pupil is open to its maximum diameter of 8.5 mm, how numerous photons per second enter the eye?

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