How does a rocket accelerate in space?

If A exerts a force on B, then B exerts an equal and opposite force on A. Or, in the case of space travel, if a mass (m) of fuel is pushed out the exhaust of a rocket, then the rocket will accelerate in the opposite direction the direction the exhaust fuel went.

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Which canal links the Atlantic and Pacific oceans?

The Panama Canal (Spanish: Canal de Panamá) is a 77.1-kilometre (48 mi) ship canal in Panama that connects the Atlantic Ocean (via the Caribbean Sea) to the Pacific Ocean. The canal cuts across the Isthmus of Panama and is a key conduit for international maritime trade.

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How many countries are there in Africa?

There are 47 countries on the African continent, including the disputed territory of Western Sahara. However, the islands off the coast are also usually listed as African, bringing the total to 53. The island nations are Cape Verde, São Tomé and Príncipe, Madagascar, the Comoros, the Seychelles, and Mauritius.

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Which civilization was responsible for the invention of the wheel?

The Sumerians, ( a civilization in ancient Mesopotamia) invented the wheel. The wheels were used to connect on chariots. It made it easier for them to get places faster. "It was one of the biggest inventions in history."

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Which bird has the largest eyes?

The eye of a bird is larger compared to the size of the animal than for any other group of animals, although much of it is concealed in its skull. The Ostrich has the largest eye of any land vertebrate, with an axial length of 50 mm (2 in), twice that of the human eye.

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Why do mosquito bites itch?

While bees and wasps inject venom when they sting, mosquitoes simply bite to feed on your blood. The bumps and itchiness that follow come from an anticoagulant that the mosquito injects to prevent your blood from clotting, which triggers a mild allergic reaction that includes the typical round, red bumps.

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What animal has four stomachs?

Ruminating mammals include cattle, goats, sheep, giraffes, bison, moose, elk, yaks, water buffalo, deer, camels, alpacas, llamas, and antelope. Ruminants differ from non-ruminants (called monogastrics) because they have a four-chambered stomach.

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What part of the plant is a carrot?

When we eat corn or peas we are eating seeds, and when we eat radish or carrot, we are eating roots. Cauliflower and broccoli plants produce flowers we like to eat. Potatoes grow under- ground, but the part we eat is not a root.

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How long does it take for nails to grow?

In humans, the nail of the index finger grows faster than that of the little finger; and fingernails grow up to four times faster than toenails. In humans, nails grow at an average rate of 3 mm (0.12 in) a month. Fingernails require three to six months to regrow completely, and toenails require 12 to 18 months.

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Can you have a fire without oxygen?

A fire cannot burn without oxygen. You can show this for yourself, in fact: if you light a small candle and then put a clear glass upside-down over that candle (without touching the flame), you can watch the flame slowly extinguish as it uses up all of the oxygen that you have trapped around it with the glass.

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Which moon in the solar system has active volcanoes?

Jupiter's Moon Io - The Most Active. Io is the most volcanically active body in our solar system. This surprises most people because Io's great distance from the sun and its icy surface make it seem like a very cold place

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How many countries are there in Africa?

There are 47 countries on the African continent, including the disputed territory of Western Sahara. However, the islands off the coast are also usually listed as African, bringing the total to 53. The island nations are Cape Verde, São Tomé and Príncipe, Madagascar, the Comoros, the Seychelles, and Mauritius.

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What organs can regenerate themselves?

The liver is the only human internal organ capable of natural regeneration of lost tissue; as little as 25% of a liver can regenerate into a whole liver. Regeneration is very rapid. The liver will return to a normal size in one to two weeks following the removal of greater than 50% of the liver by mass.

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Which animal sleeps 22 hours a day?

The sleepiest animal in the world is the koala, who sleeps 22 hours a day. Next is the sloth (20 hours), armadillo and opossum (tied at 19 hours each), lemur (16 hours), then hamster and squirrel (tied at 14 hours each).

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Is dry ice poisonous to drink with?

No it will not poison you to drink a liquid that is directly cooled by dry ice. At normal pressures there may be some gaseous CO2 dissolved in the liquid giving it a mild carbonation. However, dry ice can be dangerous to bare skin, mouth, or GI tissue if someone swallows a medium to large pieces of dry ice.

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How much do all your bones weigh?

The total weight of your bones will depends on how much your entire body weighs. Your bones will make up about 15% of your total body weight. So if you weigh 100 lbs your bones weigh about 15lbs.

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Which is the strongest muscle in the human body?

If by strongest you mean “ability to exert a force on an external object”, then a human's strongest muscle is his or her 'masseter' muscle. The masseter muscle is a thick muscle in the cheek and is located at the back of the jaw

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Is the tongue a muscle or an organ?

The tongue is a muscular organ in the mouth. The tongue is covered with moist, pink tissue called mucosa. Tiny bumps called papillae give the tongue its rough texture. Thousands of taste buds cover the surfaces of the papillae.

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What is the use of the sphygmomanometer?

A sphygmomanometer is the gauge used to measure blood pressure. The sphygmomanometer reads both systolic and diastolic pressure. A doctor takes these measurements by putting on the cuff and pumping it up, which cuts off the blood flow.

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How many bees does it take to make a tablespoon of honey?

A hive of bees must fly 55,000 miles to produce a pound of honey. One bee colony can produce 60 to 100 pounds of honey per year. An average worker bee makes only about 1/12 teaspoon of honey in its lifetime.

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