The limit to the eye's acuity is actually related to diffraction by the pupil. what is the angle between two just-resolvable points of light for a 1.75 mm diameter pupil, assuming the average wavelength of 554 nm? number o take your result to be the practical limit for the eye. what is the greatest possible distance a car can be from you if you can resolve its two headlights, given they are 1.30 m apart? number what is the distance between two just-resolvable points held at an arm's length (0.600 m) from your eye? number to find the separation angle, use the rayleigh criterion. and to find the distances for the second and third parts, use triangles and trigonometry also, don't forget to convert to sl units.

Aheat engine running backward is called a refrigerator if its purpose is to extract heat from a cold reservoir. the same engine running backward is called a heat pump if its purpose is to exhaust warm air into the hot reservoir. heat pumps are widely used for home heating. you can think of a heat pump as a refrigerator that is cooling the already cold outdoors and, with its exhaust heat qh, warming the indoors. perhaps this seems a little silly, but consider the following. electricity can be directly used to heat a home by passing an electric current through a heating coil. this is a direct, 100% conversion of work to heat. that is, 19.0 \rm kw of electric power (generated by doing work at the rate 19.0 kj/s at the power plant) produces heat energy inside the home at a rate of 19.0 kj/s. suppose that the neighbor's home has a heat pump with a coefficient of performance of 4.00, a realistic value. note: with a refrigerator, "what you get" is heat removed. but with a heat pump, "what you get" is heat delivered. so the coefficient of performance of a heat pump is k=qh/win. an average price for electricity is about 40 mj per dollar. a furnace or heat pump will run typically 200 hours per month during the winter. what does one month's heating cost in the home with a 16.0 kw electric heater? what does one month's heating cost in the home of a neighbor who uses a heat pump to provide the same amount of heating?

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.

What’s #16 asking and how do i solve it?