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If each book in the diagrams has the same mass, which diagram shows the most work done?
-- ExhibitC When an object is being raised against gravity, work is being done. Gravity is the force that must be overcome to lift an object. The amount of work done is determined by how high the object is lifted and the mass of the object. The higher an object...
What would happen to the pressure of the gas if the temperature inside the can increases?
Gases are one of three common states of matter and are affected by changes in temperature, volume, and pressure. When the pressure of a gas in a closed container becomes too high, it can cause the container to burst. The graph below illustrates the relationship between pressure and temperature (K)...
Which of the following represents the approximate combined use (in quads) of natural gas and oil in 1997?
Which of the following represents the approximate combined use (in quads) of natural gas and oil in 1997? A . 22B . 28C . 36D . 58E . 72View AnswerAnswer: D
When Susan checks her barometer tomorrow, which change is she most likely to note?
Susan is studying air pressure and makes a simple mercury barometer as shown below. She knows that air exerts pressure. More pressure on the surface of the mercury in the bowl will cause the mercury level to rise. Less pressure will cause the mercury to fall. High barometric pressure is...
Which situation is an example of a chemical change?
A physical change is a change that occurs in a substance without the formation of a different substance. In a chemical change, new substances are formed. Which situation is an example of a chemical change?A . burning a stack of papersB . melting snowC . boiling waterD . breaking glassE...
If living things use oxygen and release carbon dioxide during respiration, what is the most probable reason that the atmosphere does not become depleted of oxygen and become filled with carbon dioxide?
Since carbon dioxide dissolves in water to form an acid, an acid-base indicator such as bromthymol blue is used to track the acid concentration during plant photosynthesis and respiration. Bromthymol blue turns yellow in an acid solution and remains blue in a basic solution. The color change is reversible. A...
Which of the following actions BEST helps prevent food spoilage?
The microorganisms that cause food to spoil grow best at room temperature and in the presence of water. Which of the following actions BEST helps prevent food spoilage?A . exposing the food to airB . keeping the food at room temperatureC . adding water to the foodD . freezing the...
Which of the following was a contributing factor for the more than 8-percent decrease in heart disease mortality between 1988 and 1989?
The death rate from heart disease fell more than 8 percent in just one year during the 1980s. Advances in public awareness of heart disease and in treatments for it are thought to be partially responsible for the decline. New heart drugs, a technique called angioplasty for clearing the arteries,...
Which electromagnet will produce the strongest magnetic field?
An electromagnet is a magnet that can be turned on and off. It consists of a central metal core, such as iron, and many wrappings of wire around the metal core. An electrical current sent through the wire wrappings causes the formation of a magnetic field. There are several ways...
Which choice best explains why doctors now prescribe antibiotics less often than in the past?
The widespread use of antibiotics has created a frightening threat to our safety. While antibiotics have offered life-saving treatment for countless diseases, their misuse and overuse have contributed to the evolution of deadly bacteria that are resistant to treatment. Although there is a reluctance to give up the demand for...
