When an object is dropped the initial velocity is zero? If the object is dropped, we know the initial velocity is zero. Once the object has left contact with whatever held or threw it, the object is in free-fall. Under these circumstances, the motion is one-dimensional and has constant acceleration of magnitude g. How do […]
Why is it called the line of best fit?
Why is it called the line of best fit? The regression line is sometimes called the “line of best fit” because it is the line that fits best when drawn through the points. When we studied correlation, we saw that a linear relationship between two variables could be seen as a stream of points when […]
What is the main cause of trade winds?
What is the main cause of trade winds? The Coriolis Effect, in combination with an area of high pressure, causes the prevailing winds—the trade winds—to move from east to west on both sides of the equator across this 60-degree “belt.” The sinking air triggers the calm trade winds and little precipitation, completing the cycle. Are […]
Is James Webb Telescope working?
Is James Webb Telescope working? The JWST is being developed by NASA, the European Space Agency and the Canadian Space Agency. Work has resumed, but NASA announced that the launch date has once again been delayed to October 31, 2021. The total cost of developing the telescope has ballooned to over $10 billion. How long […]
Are there different methods of fossilization?
Are there different methods of fossilization? The chances of becoming a fossil are enhanced by quick burial and the presence of preservable hard parts, such as bones or shells. Fossils form in five ways: preservation of original remains, permineralization, molds and casts, replacement, and compression. What happens when something is fossilized? When something fossilizes, it […]
What happened to the water when put inside the freezer?
What happened to the water when put inside the freezer? When you put liquid water into the freezer, the water loses energy to the cold air in the freezer. At first, the water molecules move more slowly. This means that the temperature of the water drops. Why is freezing a good method of preservation? Freezing […]
Which factor does not affect the rate of transpiration in plant presence of cuticle?
Which factor does not affect the rate of transpiration in plant presence of cuticle? Some internal factors also affect rate of transpiration e.g., leaf area, leaf structure and age of plants. Chlorophyll content of leaves does not directly affect rate of transpiration. Which is not correct about transpiration? Excessive transpiration will lead to water stress, […]
What causes problems regulating body temperature?
What causes problems regulating body temperature? Hyperthyroidism occurs when your thyroid produces too much of the hormone thyroxine. Thyroxine affects the regulation of your body’s metabolism. An excess of this hormone can cause your body’s metabolism to increase, which leads to a rising body temperature. Graves’ disease is the most common cause of hyperthyroidism. Why […]
What is the working principle of piezoelectric transducers?
What is the working principle of piezoelectric transducers? The main principle of a piezoelectric transducer is that a force, when applied on the quartz crystal, produces electric charges on the crystal surface. The charge thus produced can be called as piezoelectricity. What are the materials used for piezoelectric transducer? There are three basic classes of […]
What advantages does a radio telescope have?
What advantages does a radio telescope have? Radio telescopes detect radio waves coming from space. Although they are usually very large and expensive, these telescopes have an advantage over optical telescopes. They can be used in bad weather because the radio waves are not blocked by clouds as they pass through the atmosphere. What were […]