If we know that 3-2a of a + 2-4b + 5 of B = 0, then B of a =?

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• 1. The resistance ratio of a and B is 4:5. If a and B are connected in parallel in a circuit, the total power consumed is 18W, then the electric power of a and B is respectively 18W____ W、_____
• 2. By solving the system of linear equations of two variables, A garment factory processes a batch of suits. It can cut 10 coats or 13 pairs of trousers every 15 meters. The existing material is 345 meters. In order to match the coats and trousers, how many meters of the material are allocated to the coats and trousers?
• 3. What are the physical quantities of electric power? What are their units? What are their letters?
• 4. A spring with stiffness coefficient K. cut it into two equal length segments, and then combine the two segments to form a new spring. What is the stiffness coefficient of the new spring
• 5. I want to ask the experts what are the units of voltage, current and resistance when they convert?
• 6. A small ball with a mass of 0.1kg is suspended on the top of the inclined plane with an inclination angle of 37 ° by a thin wire, as shown in Figure 11. When the system is stationary, the rope is parallel to the inclined plane, A small ball with a mass of 0.1kg is suspended at the top of the inclined plane with an inclination of 37 degrees by a thin wire. The static state of the system is that the rope is parallel to the inclined plane, regardless of all friction, and the system accelerates. When the accelerations are 5m / s, 10m / s and 24m / s respectively, what are the pulling forces on the rope I just don't want to forget it,
• 7. If the side length of a square is 3 and the side length increases x, the area increases y, the analytic function of Y changing with X is obtained
• 8. As shown in the figure, the mass of the shell of the spring scale is M0, and the mass of the spring and the hook is ignored. The mass of a heavy object suspended by the hook is m. now the external force F in a vertical direction is used to pull the spring scale to make it move upward uniformly and accelerate. The reading of the spring scale is: () A. Mg; B. [M / (M0 + m)] mg; C. [M0 / (M0 + m)] f; D. [M / (M0 + m)] f according to Newton's second law Overall study f = (M0 + m) a Research object f bullet = ma The result shows that the reading F of spring scale is [M / (M0 + m)] f, why f = (M0 + m) a instead of F = (M0 + m) a + (M0 + m) g
• 9. For a number, the sum of its three digits is 20. And it is the largest three digits of all the multiples of 5 made up of its three digits. This number is ()
• 10. The two elements represented by the atomic numbers of the following groups can form AB2 type ionic compounds () A. 6 and 8b. 11 and 13C. 11 and 16d. 12 and 17
• 11. Two bulbs marked with 220 V, 100 W and 220 V, 40 W are connected in series in a 220 V circuit. Why is 40 W better than 100 W
• 12. If the lengths of the two sides of the triangle are 8 and 6 respectively, and the length of the third side is a real root of the quadratic equation x2-16x + 60 = 0, then the area of the triangle is () A. 24B. 24 or 85C. 48D. 85
• 13. Unit of measurement: how to convert kg to liter? When I compare AB glue, one unit is kg, one unit is liter, What is the conversion between kg and liter? Which unit should I use to convert AB glue?
• 14. 3 / 8-5 / 6 =? It should not be divided into 9 / 24 to 20 / 24. If it is not enough, what should we do
• 15. In the experiment of measuring resistance by voltammetry, sliding rheostat has () A. Change the current in the circuit B. change the voltage at both ends of the measured resistance C. change the resistance value of the measured resistance D. protect the circuit
• 16. 2:1 / 4, 0.24:56, 0.2:1 / 5, 125:1 / 4
• 17. If the two fixed value resistors R1 and R2 are connected to the power supply in one way, the power consumed by R1 is 9 watts; if the two resistors are connected to the power supply in another way, the power consumed by R1 is 16 watts, and the current passing through R2 is 4a. What are the power supply voltage and the resistance values of R1 and R2
• 18. Simple operation 7 / 3 * 15 / 14 * 8 / 5
• 19. What is the current passing through the bulb marked with "220V 40W" in normal operation? What is the resistance in normal lighting
• 20. How to calculate the problem of 1002 & # 178; - 1002 * 4 + 4?