Answer the following question given this paragraph: In physics, a quantity, such as mass, length, or speed that is completely specified by its magnitude and has no direction is called a scalar . A vector , on the other hand, is a quantity possessing both magnitude and direction. A vector quantity is typically represented by an arrow-tipped line segment. The length of the line, drawn to scale, represents the magnitude of the quantity. The direction of the arrow indicates the direction of the vector. Not only can vectors be represented graphically, but they can also be added graphically. Q: What do vectors possess that scalars do not? Choices: - height and polarity - direction and texture - magnitude and weight - magnitude and direction A:
magnitude and direction
Answer the following question given this paragraph: Mitochondria are organelles whose membranes are specialized for aerobic respiration. Q: Organelles whose membranes are specialized for aerobic respiration are called what? Choices: - vacuoles - mitosis - chloroplasts - mitochondria A:
mitochondria
Q: Answer the following question given this paragraph: The oceans are most polluted along coasts. Why do you think that's the case? Of course, it's because most pollution enters the oceans from the land. Runoff and rivers carry the majority of pollution into the ocean. Many cities dump their wastewater , water mixed with waste, directly into coastal waters. In some parts of the world, raw sewage and trash may be thrown into the water ( Figure below ). Coastal water may become so polluted that people get sick if they swim in it or eat seafood from it. The polluted water may also kill fish and other ocean life. Q: Where are the oceans most polluted? Choices: - in warmer waters - on the ocean floor - along reefs - along coasts A:
A: along coasts
Question: Answer the following question given this paragraph: Pulmonary circulation is the part of the circulatory system that carries blood between the heart and lungs (the term pulmonary means "of the lungs"). It is illustrated in Figure below . Deoxygenated blood leaves the right ventricle through pulmonary arteries, which transport it to the lungs. In the lungs, the blood gives up carbon dioxide and picks up oxygen. The oxygenated blood then returns to the left atrium of the heart through pulmonary veins. Q: While in the lungs, blood gives up carbon dioxide and picks up what element before returning to the heart? Choices: - nitrogen - methane - hydrogen - oxygen A:
Answer: oxygen
*Question*
Answer the following question given this paragraph: The decay of an unstable isotope to a stable element occurs at a constant rate. This rate is different for each parent-daughter isotope pair. The decay rate is measured in a unit called the half-life. The half-life is the time it takes for half of a given amount of an isotope to decay. For example, the half-life of carbon-14 is 5,730 years. Imagine that you start out with 100 grams of carbon-14. In 5,730 years, half of it decays. This leaves 50 grams of carbon-14. Over the next 5,730 years, half of the remaining amount will decay. Now there are 25 grams of carbon-14. How many grams will there be in another 5,730 years? The figure below graphs the rate of decay of a substance ( Figure below ). Q: The rate at which an unstable isotope decays is measured in a unit known as what? Choices: - full-life - staying-life - half-time - half-life A:
**Answer**
half-life
(Question)
Answer the following question given this paragraph: Brass saxophone: Brass is an alloy of copper and zinc. It is softer than bronze and easier to shape. It's also very shiny. Notice the curved pieces in this shiny brass saxophone. Brass is used for shaping many other curved objects, such as doorknobs and plumbing fixtures. Stainless steel sink: Stainless steel is a type of steel that contains nickel and chromium in addition to carbon and iron. It is shiny, strong, and resistant to rusting. This makes it useful for sinks, eating utensils, and other objects that are exposed to water. "Gold" bracelet: Pure gold is relatively soft, so it is rarely used for jewelry. Most "gold" jewelry is actually made of an alloy of gold, copper and silver. Bronze statue: Bronze was the first alloy ever made. The earliest bronze dates back many thousands of years. Bronze is a mixture of copper and tin. Both copper and tin are relatively soft metals, but mixed together in bronze they are much harder. Bronze has been used for statues, coins, and other objects. Q: What alloy is made from copper and zinc? Choices: - iron - stele - manganate - brass A:
(Answer)
brass