Figure 5-53 shows a man sitting in a bosun's chair that dangles from a massless rope, which runs over a massless, frictionless pulley and back down to the man's hand. The combined mass of man and chair is 95.0 kg. With what force magnitude must the man pull on the rope if he is to rise (a) with a constant velocity and (b) with an upward acceleration of 1.30 mls2? (Hint: A free-body diagram can really help.) If the rope on the right extends to the ground and is pulled by a coworker, with what force magnitude must the co-worker pull for the man to rise (c) with a constant velocity and (d) with an upward acceleration of 1.30 m/s2 ? What is the magnitude of the force on the ceiling from the pulley system in (e) part a, (f) part b, (g) part c, and (h) part d?
Vision - Amplitude and wavelength Theories 1. Young – Helmhaltz 2. Herings 3. Duel- process Young- Helmhaltz trichromatic theory - Individual cones are most sensitive to wavelengths that respond to either blue, green, or red - * red-green color blindness, how do they see yellow Herings- Opponent - Each of the three core types responds to 2 different wavelength - Red and green - Black and white - Yellow and blue - Saw part that was not exhausted Dual Process - Combines two theories Sound Amplitude- loudness Wavelength- pitch Translation - Sound waves pass through auditory canal to the ear drum - Transmitted to cochlea (hammer, anvil, stirrup
