A fire hose held near the ground shoots water at a speed of 6.5m/s. At what angle(s) should the nozzle point in order that the water land 2.5 away?1. Sketch the trajectory for the 18 degree angle.2. Sketch the trajectory for the 72 degree angle.Please tell me the exact points for each graph like how many points ( high, low, middle) and where will they be on the graph. PLEASE HELP ME ON 2 GRAPH QUESTIONS
Very salty water will freeze at about 26 deg. F. ,if it is much colder it will have very little effect.
Expensive, not great environmentally and really tough on metal surfaces and roads as well.
1. Salt makes your car rust faster. 2. The build-up salts along the roadway kills the plants which isn't bad for the weeds, but it is bad for native plants and plants that feed wildlife.
i) It can corrode his hands because it has a high concentration of hydrogen ion and is corrosive ii) Pour concentrated NaOH,it can neutralize the acid iii)Arrange the chemicals orderly on the lab table
The primary problem with salt is environmental. It kills vegetation surrounding the roads, get into the water supply, and generally sterilizes the soil so that it won't grow anything. It also causes a shorter life span on vehicles. Where I was growing up, they used chains or studs on tires and didn't use salt (mountains) and our used cars lasted 20 years. I'm currently driving a 1993 Mercury that has essentially been destroyed by salt in only a few years. I have to trash it this year, despite the fact that it looks good and is reliable, because the rust has eaten into the primary body, making it unsafe. The advantage of salt is that it is cheap, and easy to spread. Does a pretty good job too. Our area is now using a more expensive product. Unfortunately, unlike salt, it doesn't work at all if the temp is below zero. Not real helpful in a cold, northern state in Winter.
