Mr. johnson challenged his students to see which group could dissolve salt the fastest in 100 ml of water. the students could change any variable(s) except the volume of water used. group 1 changed the water temperature. they used tap water at 22oc and then three other temperatures: 32, 42, and 52  oc. they did not stir the mixture and they kept the volume of the water constant, just like mr. johnson directed. the salt dissolved fastest in the warmest water. in their conclusions, group 1 wanted to include a line graph of their data.  what label(s) should they place on the x axis? a)rate of dissolving. b)volume of water used. c)time to dissolve (sec). d)temperature of water

Clothing made of several thin layers of fabric with trapped air in between, often called ski clothing, is commonly used in cold climates because it is light, fashionable, and a very effective thermal insulator. so it is no surprise that such clothing has largely replaced thickand heavy old-fashioned coats. (a) consider a jacket made of five layers of 0.1-mm-thick synthetic fabric (k = 0.13 w/m·°c) with 1.5-mm-thick air space (k = 0.026 w/m·°c) between the layers. assuming the inner surface temperature of the jacket to be 28°c and the surface area to be 1.25 m2, determine the rate of heat loss through the jacket when the temperature of the outdoors is 0°c and the heat transfer coefficient at the outer surface is 25 w/m2·°c. (b) what would your response be if the jacket is made of a single layer of 0.5-mm-thick synthetic fabric? what should be the thickness of a wool fabric (k = 0.035 w/m·°c) if the person is to achieve the same level of thermal comfort wearing a thick wool coat instead of a five-layer ski jacket?

What is the power rating of the lightbulb if 3.0 a flow through it when connected to a 15 v battery

What effects result when there is an impact between earth and an asteroid? check all that apply. a.massive flooding. b.extinction of many life forms.c.major earthquakes change in average global temperature.d. giant dust cloud