Just as the surface area-to-volume ratio depends on size, so can other properties. to see how, suppose that your size suddenly doubled; that is, your height, width, and depth all doubled. (for example, if you were 5 feet tall before, you now are 10 feet tall.) a) by what factor has your waist size increased? b) how much more material will be required for your clothes? (hint: clothes cover the surface area of your body.) c) by what factor has your weight increased? (hint: weight depends on the volume of your body.) d) the pressure on your weight-bearing joints depends on how much weight is supported by the surface area of each joint. how has this pressure changed?

Which articulations allow for greatest range of motion?

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?

What are the starting materials for nuclear fission? two small nuclei two large nuclei a neutron and a large nucleus a neutron and a small nucleus