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8. The Chang'e-1 lunar exploration satellite developed by our country runs along the elliptical orbit with the near moon point and the far moon point. When the satellite moves from the near moon point to the far moon point, the satellite () increases () decreases (both filled with "kinetic energy" or "gravitational potential energy")
Satellite (kinetic energy) increases (gravitational potential energy) decreases
The weight of a box is 1200n. The tension f is 100. The box moves in a straight line at a speed of 0.1m/s. If the mechanical efficiency of the pulley block is 90%, what is the work done by the tension in 5 seconds? What is the friction force between the box and the horizontal ground (n = 3). The formula tells me
P=FS=Fvt=100N*0.1M/S*5S=50J
The mechanical power of the pulley is 90%, so the force F really acts on the box is 90% F, that is 90N
Because of the uniform linear motion, f = f (pull) = 90N
Which uses the control variable method in junior high school physics experiment?
I'm going to take the senior high school entrance examination soon. What are the main points of summing up physics experiments?
Explore the relevant factors of liquid internal pressure
Explore the factors that affect the kinetic energy
Explore the relationship between small bulb brightness power
Explore the relationship between the current through the resistance and the voltage at both ends
Explore the factors that affect the thermal effect of current
To explore the influence factors of electromagnet magnetic strength
Explore the factors that affect the size of sliding friction
Explore the factors that affect the effect of stress
Pay attention to physical methods and formulas, pay attention to practice, pay attention to the mentality before the exam
RELATED INFORMATIONS
- 1. The control variable method is used in those experiments in junior high school physics learning
- 2. What are the control variables of physics experiment in junior high school Let's give examples instead of big discussions. Let's name each one
- 3. On the experiment of "control variable method"
- 4. What is the difference between the control test method and the control variable method How to choose? Is there a difference between doing it at the same time and not at the same time?
- 5. How much does a physics book weigh And the weight of a desk, the weight of an apple
- 6. Now I'm in the second year of junior high school. I want to buy a physics book. Please introduce it to me Such as the title, recommend good I give bonus points!
- 7. How to use the control variable method to get the experiment?
- 8. The rainbow appears in the sky after the rain. It's light______ The propagation speed of different colors of light in the air is different______ If the wavelengths of red, orange, yellow, green, blue, indigo and purple light decrease in turn, the light with the highest frequency is the one with the highest frequency______ Color light
- 9. The propagation of physical light 1. The phenomenon of solar eclipse is explained by the () principle of light 2. The light from the sun will reach the earth in about 8 minutes. Please calculate the distance between the sun and the earth, which is about () M 3. The principle of pinhole imaging is () 4. Pinhole imaging is formed by ()
- 10. The propagation speed of sound and light in the air is about 340m / s and 3 × 108m / s respectively. In the 100 meter race, if the timekeeper starts to count when he hears the starting gun, the time of counting is longer than the actual running time of the athlete______ (choose "more" or "less")______ s．
- 11. If the two bulbs of "220 V & nbsp; 25W" and "220 V & nbsp; 40W" are connected in parallel to the 220 V circuit first, and then connected in series to the same circuit, then () A. The total power consumption of two lamps connected in parallel is greater than that in series D. the total power consumption of two lamps connected in series is greater than that in parallel
- 12. Junior high school physics: energy conversion, about internal energy Please give examples of the life in which internal energy is converted into other forms of energy and other forms of energy are converted into internal energy In addition, when baking bread in an electric oven, is it right that electric energy is converted into internal energy? Generally speaking, most of the internal energy is converted into other energy by gas or liquid? In addition, can the energy of solid be converted into internal energy by other energy? Isn't its molecular structure very stable?
- 13. The difference between energy conversion and transfer
- 14. The migration and transformation of heavy metals in soil are mainly physical and chemical processes This is a judgment question, right or wrong! Some textbooks also say that there are mainly physics,
- 15. Discussion on energy transformation or transfer in junior high school physics State how the following energy is transformed or transferred 1. Rocket points and then soars 2. The flying meteor has a luminous tail People feel warm when they are in the sun 4. Use solar water heater to boil water 5. When the tube filled with water blocked by the plug is heated, the plug is flushed open Thank you~~~
- 16. What is equivalent substitution method?
- 17. Equivalent substitution method i want!
- 18. What is the physical meaning of D in D-value method?
- 19. What is the relationship between transformation method and amplification method in physics experiment? Please give an example to explain it in detail
- 20. Male wire is a unit of length measured in one degree. How many millimeters is a male wire equal to?