Category: Physics

What is blue light and why is it bad? Continued exposure to blue light over time could damage retinal cells and cause vision problems such as age-related macular degeneration. It can also contribute to cataracts, eye cancer and growths on the clear covering over the white part of the eye. What does blue light symbolize? […]

What is the difference between synoptic and prognostic charts? 2. How are prognostic charts different from synoptic weather maps? Prognostic charts are computer generated forecast showing the expected pressure pattern at a specific future time. Synoptic weather maps describe the state of the atmosphere over a large area at a given moment. What is good […]

What is a Type D fire? Class D. Class D fires involve combustible metals, such as magnesium, titanium, and sodium. Extinguishers with a D rating are designed to extinguish fires involving combustible metals. Note: Common extinguishing agents may react with a combustible metal fire causing the severity of the fire to increase. What is a […]

What is the mass of an object that weighs 1000 N? 1N=1kg⋅m/s2. Although almost the entire world uses the newton for the unit of force, in the United States, the most familiar unit of force is the pound (lb), where 1 N = 0.225 lb. Thus, a 225-lb person weighs 1000 N. What is the […]

What causes neon to glow? Neon lighting consists of brightly glowing, electrified glass tubes or bulbs that contain rarefied neon or other gases. A high potential of several thousand volts applied to the electrodes ionizes the gas in the tube, causing it to emit colored light. The color of the light depends on the gas […]

What are two examples of colloids? Examples of colloid are mayonnaise, milk, butter, gelatin, jelly, muddy water. What are the 4 types of colloids? The types of colloids includes sol, emulsion, foam, and aerosol. Sol is a colloidal suspension with solid particles in a liquid. Emulsion is between two liquids. Foam is formed when many […]

What is special about summer solstice? The day that the Earth’s North Pole is tilted closest to the sun is called the summer solstice. This is the longest day (most daylight hours) of the year for people living in the northern hemisphere. It is also the day that the Sun reaches its highest point in […]

What are the 4 types of skids? Driver Ed: Chapter 13 – Natural Laws and Risk Management A B Cornering Skid You lose steering control in a turn, and the car begins to skid Blowout Skid tire suddenly loses air pressure, and the car begins to skid. List the four different types of skids. Braking, […]

How do I combine two plots in R? Combining Plots R makes it easy to combine multiple plots into one overall graph, using either the. With the par( ) function, you can include the option mfrow=c(nrows, ncols) to create a matrix of nrows x ncols plots that are filled in by row. The layout( ) […]

How many pounds of nitrogen per acre are needed for corn? 250 pounds How much nitrogen do you put in a hay field? “Apply 50 to 60 pounds per acre of nitrogen on your best grass stands and 30 to 40 pounds per acre on the rest,” he recommends. Thomas suggests a similar amount of […]