Physics
Grade-9
Easy
Question
Motion in a straight line is called:
- Rectilinear motion
- Periodic motion
- Rotational motion
- Circular motion
Hint:
The hot water that falls from a coffee vending machine into the coffee cup is in rectilinear motion.
The correct answer is: Rectilinear motion
A rectilinear motion is defined as any motion in which objects follow a straight path. Examples of rectilinear motion. The hot water that falls from a coffee vending machine into the coffee cup is in rectilinear motion. Bowling balls move rectilinearly within a lane..
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Select topic sentence of below paragraph.
In the developing world, 1.1 billion people still do not have access to safe drinking water, 2.6 billion do not have access to adequate sanitation services, and waterborne diseases are responsible for more than 1.6 million deaths each year (mostly in children under five). Water is often too expensive or inaccessible to the poorest members of society in developing countries, while the wealthy have it piped into their homes. Furthermore, due to the infrastructure used to control water, entire seas are being lost, rivers are drying up, millions of people have been displaced to make room for reservoirs, groundwater aquifers are being pumped down, and water disputes have raised tensions from local to international levels. Fresh water is a scarce resource in many parts of the world, and it is expected to become even more so as the twenty-first century progresses.
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In the developing world, 1.1 billion people still do not have access to safe drinking water, 2.6 billion do not have access to adequate sanitation services, and waterborne diseases are responsible for more than 1.6 million deaths each year (mostly in children under five). Water is often too expensive or inaccessible to the poorest members of society in developing countries, while the wealthy have it piped into their homes. Furthermore, due to the infrastructure used to control water, entire seas are being lost, rivers are drying up, millions of people have been displaced to make room for reservoirs, groundwater aquifers are being pumped down, and water disputes have raised tensions from local to international levels. Fresh water is a scarce resource in many parts of the world, and it is expected to become even more so as the twenty-first century progresses.
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According to popular belief, while the dog is man's best friend, the coyote is his worst enemy. The coyote's bad reputation stems from his fondness for small animals; he hunts at night and is especially destructive to sheep, young pigs, and poultry. However, it is sometimes beneficial to coyotes. If valuable farm animals are protected, the coyote will frequently free the property of other animals, such as rabbits, which are destructive to the crops and certain trees. He is especially useful in keeping the rodent population under control. Where coyotes have been allowed to do their work without being harassed, ranchers and fruit growers have found them to be so valuable that they would not shoot them any more than they would shoot their dogs.
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According to popular belief, while the dog is man's best friend, the coyote is his worst enemy. The coyote's bad reputation stems from his fondness for small animals; he hunts at night and is especially destructive to sheep, young pigs, and poultry. However, it is sometimes beneficial to coyotes. If valuable farm animals are protected, the coyote will frequently free the property of other animals, such as rabbits, which are destructive to the crops and certain trees. He is especially useful in keeping the rodent population under control. Where coyotes have been allowed to do their work without being harassed, ranchers and fruit growers have found them to be so valuable that they would not shoot them any more than they would shoot their dogs.
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Because electronic computers are now used for data processing, the general public believes it is a mysterious, complicated science and that computers are giant brains. Both of these assumptions are incorrect. A computer is essentially a high-speed adding machine that performs the functions that are programmed into it. If the input data is even slightly changed, the computer will not be able to function until it is programmed to accept the changes. The business operations it performs are impressive only because of the extremely fast manipulation speed, but the majority of these operations have been used for decades. In contrast to humans, computers can perform repetitive calculations without becoming tired or bored.
Select topic sentence of below paragraph.
Because electronic computers are now used for data processing, the general public believes it is a mysterious, complicated science and that computers are giant brains. Both of these assumptions are incorrect. A computer is essentially a high-speed adding machine that performs the functions that are programmed into it. If the input data is even slightly changed, the computer will not be able to function until it is programmed to accept the changes. The business operations it performs are impressive only because of the extremely fast manipulation speed, but the majority of these operations have been used for decades. In contrast to humans, computers can perform repetitive calculations without becoming tired or bored.
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