For a man-made earth satellite with mass m moving in a circular orbit, the distance from the ground is equal to the radius of the earth R, and the mass of the earth is m? (2) What is the period of satellite motion?

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• 1. The mass of the sun is about several times that of the earth It's urgent!
• 2. How many times the mass of the sun is that of the earth?
• 3. A what does a full stop mean? It should be an order of magnitude in physics, but I don't know how much
• 4. How many nanometers is the diameter of the molecule?
• 5. 9. Macro objects are made up of a large number of molecules, which are about the order of magnitude in diameter_____ m.
• 6. The speed of the earth around the sun is about 11000km / h, and the speed of sound in the air is about 340m / s
• 7. How many times the mass of the sun is that of the earth? this is it!
• 8. What is the motion of the earth around the sun? What is its cycle? What is its average distance from the sun
• 9. It is known that the mass of the sun is 1.97 * 10 ^ 30kg, the mass of the earth is 6.68 * 10 ^ 24kg, and the average distance between the sun and the earth is 1.49 * 10 ^ 11m The gravitational force between the sun and the earth is_____ N. It is known that the tensile force of 5.98 * 10 ^ 24N is needed for a steel bar with a cross-sectional area of 1cm, so what is the cross-sectional area that can be pulled by the gravitational force between the earth and the sun_____ M ^ 2 Please write down the analysis process,
• 10. It is known that the mass of the earth is 6 × 10 ^ 24kg, the mass of the sun is 2.0 × 10 ^ 30kg, and the orbit radius of the earth around the sun is 1.5 × 10 ^ 11m (1) The gravity of the sun on the earth (2) The centripetal acceleration of the earth around the sun
• 11. For a man-made earth satellite with mass m in circular orbit, its distance to the ground is equal to the radius r of the earth, and the acceleration of gravity on the ground is g, Then () A. The linear velocity is root 2rg B. The period is 4 π times the root sign 2R / g C. The acceleration is 1 / 2 times G D. The angular velocity is 1 / 2 times the root sign g / 2R
• 12. The period of a man-made earth satellite orbiting the earth in a circular orbit may be () A. 60 minutes B, 80 minutes C. 180 minutes D, 25 hours Shouldn't it be more than 24 hours? I chose D, the answer is CD, why
• 13. 1. The mass of the earth is 9.89 times 10 to the power of 21 tons, and the mass of Jupiter is about 1.9 times 10 to the power of 24 tons, so the mass of Jupiter is twice that of the earth 2. If the cross section of a virus is a circle with a diameter of about 1.56 times 10 to the minus 6 square meters, then the cross section area of this virus is square meters Two questions, please
• 14. The speed of man-made satellite is about 7.9 kilometers per second. The speed of man-made satellite is 2 / 3 of that of spaceship. How many kilometers per second does spaceship run? Who can answer that?
• 15. If a man-made satellite circulates around the earth at a uniform speed and its orbit radius is 13 times of that of the moon around the earth, the cycle of the satellite is about () A. 1-4 days B. 4-8 days C. 8-16 days D. 16-20 days
• 16. At 028 on February 3, 2007, China successfully launched the () test satellite into space with the long march 3A carrier rocket at the Xichang Satellite Launch Center
• 17. On October 15, 2003, Shenzhou-5 spacecraft was successfully launched into space by the long march-2f high thrust rocket, marking a new page in China's space technology. Please answer the following questions based on your physical knowledge: 1) during the normal operation of the spacecraft, the mass of the astronauts in weightless condition______ (fill in "changed" or "unchanged")______ Inertia (fill in "no" or "still have"). ② if the spaceship travels in space for 21 hours, makes 14 circles around the earth, and flies about 610000 km, the speed of the spaceship is about______ Km / h. (integer)
• 18. On October 15, 2007, the Shenzhou-5 spacecraft was successfully launched into space by the long march-2 giant thrust rocket, marking the beginning of a new page in China's space technology. Please answer the following questions based on your physical knowledge: (1) during the normal operation of the spacecraft, the mass of the astronauts in weightlessness (choose "smaller", "larger" or "unchanged"), Inertia (fill in "no" or "still have"); (2) when the spaceship travels in space, the effect of its force (select "received" or "not received"), the basis for your judgment is; (3) the spaceship travels for 21 hours, circling the earth for 14 hours 1. The spaceship travels in space for 21 hours, making 14 circles around the earth. Try to judge whether the spaceship is affected by the force when it travels in space_________________ 2. The reentry module returns to earth at a height of 1.2m from the ground. The recoil engine spurts fire to the ground, and the spacecraft decelerates further and finally lands. It contains the mechanical knowledge:_______________
• 19. When the atmospheric pressure is 1.013 × 105Pa, the boiling point of liquid nitrogen is - 195.8 ℃, the boiling point of liquid oxygen is - 183 ℃, the boiling point of liquid helium is - 219 ℃, and the boiling point of liquid carbon dioxide is - 78.44 ℃. When the liquid air is separated, the sequence of the above gases separated with the increase of temperature is () A. Nitrogen, oxygen, helium, carbon dioxide B. helium, nitrogen, oxygen, carbon dioxide C. carbon dioxide, oxygen, helium, nitrogen D. helium, carbon dioxide, oxygen, helium
• 20. P = f / S = 6N / 4 × 10 negative third power M & # 178; = 1.5 × 10 third power PA how can we get 1.5 × 10 third power pa by this formula for pressure