单项选择题Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage.According to the passage, how many miles is the earth’s diameter A. 2,000. B. 4,000. C. 8,000. D. ...
When the moon moves completely into the Earth's dark shadow cone (called the "umbra") we call that a total lunar eclipse. At the moon's average distance from Earth of 239,000 miles [383,000 km], the umbra measures roughly 5,800 miles [9,334 km] in diameter. The moon is about 2...
Hang glider over Jockey's Ridge, NC Photo courtesy Kitty Hawk Kites To launch, the pilot must run down a slope to get air moving across the wing at about 15 to 25 miles per hour (24 to 40 kph). This movement of air over the surface of the wing generates lift, the force that co...
Cruise missiles have an 8.5-foot (2.61-meter) wingspan, are powered by turbofan engines and can fly 500 to 1,000 miles (805 to 1,610 km) depending on the configuration. A cruise missile's job in life is to deliver a 1,000-pound (450-kg) high-explosive bomb to a precise location...
They can make the weapon smaller in diameter. The smaller cross-sectional area means that the bomb has to move less material (earth or concrete) "out of the way" as it penetrates. They can make the bomb faster to increase its kinetic energy. The only practical way to do this is to ad...
Now you would think recreating a giant 432,474 mile diameter ball of gas that’s 93 million miles away would be difficult, but it’s actually quite simple. All you need is a powerful strobe, move it up 92.999 million miles closer, and viola, Sun galore!
My late parents were Displaced Persons from Latvia- and they traveled many miles to get rye flour and other strong milled grains near Toronto in the 1950s and 60s. This past June, three of my nieces- daughters of all my late siblings, asked if I would go to Latvia with them – their...
(10 km). The mean radius of the sun is 432,450 miles (696,000 kilometers), which makes its diameter about 864,938 miles (1.392 million km). You could line up 109Earthsacross the face of the sun, according toNASA. The sun's circumference is about 2,715,396 miles (4,370,006 km...
What is the diameter of the Sun?What is the radius of the Earth, in kilometers and in miles?At ground level g is 9.8 m / s 2 suppose the earth starts to increase its angular velocity. How long would a day be when people on the equator were just thrown off....
What's in a Name? The term "biker" has come to be associated with members of motorcycle gangs, which is why many motorcycle enthusiasts prefer the terms "rider" or "motorcyclist." Born-again bikers are motorcycle riders in their 40s and 50s, a demographic that had not been well-represente...