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A box contains the same size but different colors of the ball, respectively, red, yellow, green, white four colors of the ball each 10, ask at least to find out______ Five balls guarantee five of the same color
Consider the four colors of red, yellow, green and white as four drawers, and consider the worst case: a total of 4 × 4 = 16 balls are found in each drawer, that is, four balls of the same color are found in each drawer. At this time, if you feel any ball, no matter which drawer you put it in, there will be a drawer with five balls in it, 16 + 1 = 17. A: at least 17 balls must be found to keep the drawer safe So the answer is: 17
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- 1. There are 20 red, yellow and blue balls of the same size and texture in the pocket. Only when you touch at least a few balls at a time can you guarantee at least four colors The same color? Process and answer
- 2. There are three red, yellow and blue balls of the same size in one pocket. At least () balls should be found at a time. There must be two balls of the same color
- 3. The function of resistance and capacitance Resistance and capacitance introduction, resistance type classification, resistance basic circuit What are resistance and capacitance? Where are the different places?
- 4. 11. A voltmeter is composed of ammeter g and resistor R in series, as shown in the figure. If it is found that the reading of this voltmeter is always a little smaller than the accurate value in use, take 11. A voltmeter is composed of ammeter g and resistor R in series, as shown in the figure. If it is found that the reading of this voltmeter is smaller than the accurate value, which of the following measures can be adopted to improve it A. A resistor much smaller than R is connected in series with R B. A resistor much larger than R is connected in series with R C. Parallel a much smaller resistor to R D. Parallel a much larger resistor to R
- 5. What is the specific resistance value of "1K", "100", "10" and "1" in ohmmeter? Is it that the resistance value is small when the number of blocks is large? It's not about how to calculate in use, but about the internal structure of the ohmmeter Is the internal ohmmeter equivalent to an ammeter or a voltmeter? If it is an ammeter, then its full bias current I should be constant no matter in which gear. In this way, the full bias current multiplied by the resistance value of different gears is the total voltage. If the resistance value of each gear is different, then the total voltage is also different. This is definitely not right. What's the situation?
- 6. A kilowatt hour is a kilowatt. Do you need the next kilowatt hour
- 7. When a bulb marked pz220-40 is connected to a 110 volt circuit, the actual power consumed by the bulb is
- 8. It is known that R1: R2 = 1:2. When resistor R1 and R2 are in parallel, what is the ratio of electric power P1: P2? When resistor R1 and R2 are in series, the ratio of heat Q1: Q2 =?
- 9. The method of measuring resistance with voltmeter and ammeter is called voltammetry. Its principle is as follows_____ . In the experiment of measuring resistance by voltammetry, the function of sliding rheostat is______________ Change the current in the measured conductor and the voltage at both ends three times in order to____________
- 10. How many watts is 1p equal to
- 11. There are 10 red, yellow and blue balls in one pocket. How many balls do you need to find out if you want to find out 10 balls of the same color? A、4 B、5 C、6 D、10 I don't think it's right At least... Wrong? It can't be 10. Can you guarantee it's the same 10 times? Then you go to buy lottery tickets! If you really mean to be more specific! Why?
- 12. There are six red, yellow and blue glass balls of the same size in the pocket. At least how many can guarantee three glass balls?
- 13. There are 15 small balls in black, white and red, which are mixed and put in the bag, from which several balls can be found? Write out the answer process that accords with the thinking level of primary school students
- 14. Put 10 red, yellow and white balls in a bag, at least take a few balls, you can get three colors of the ball
- 15. There are several red, yellow and green balls in the bag, and each ball has its own color. Now, if you feel out any one of them, the probability of getting a red ball is 13, and the probability of getting a yellow ball is 12. It is known that there are three green balls. How many red balls and yellow balls are there in the bag?
- 16. There are three red, yellow and blue balls in the bag. If you take three balls out of your pocket, how many are there in all?
- 17. There are 161 glass balls. Red is five times as much as yellow, and yellow is as much as green. How many glass balls are there in each of the three colors?
- 18. Each bead above the abacus represents ()
- 19. What does one bead mean on the abacus? What does the next bead mean
- 20. There are 20 beads of 5 different colors in the bag. To ensure that 4 beads of the same color are taken out, at least () beads should be taken out Will anyone