![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
What is the relationship between friction work and internal energy, What is the relationship between positive and negative work done by friction and internal energy?
W = FS w work f friction s movement distance
I'm tired. I want the red flag
Five billion joules is equal to how many degrees centigrade, how much strength
Strength, such as whether it can destroy steel, what it can destroy,
This is a problem in junior high school physics. It's impossible to understand without physical basis. The core of the problem is: Joule is the unit of energy. Centigrade is the unit of temperature. Force So you may not understand it. Let's say it directly: there is no direct connection between the several physical quantities you said, and they all need one or two other physical quantities to
23 Joule what consciousness
When a force of 23 n acts on an object to advance 1 m (or a force of 1 N acts on an object to advance 23 m), the force does 23 joules of work on the object
How much is the heat of 420000 joules raised by the water with an initial temperature of 95 ℃ and a mass of 10kg? (standard atmospheric pressure) ask for the help of God
100 ℃, because you can calculate 420000j directly without considering other conditions, which can increase 10kg water by 10 ℃, but under standard atmospheric pressure, the boiling point of water is 100 ℃, and it will not rise again, even if the vaporized water is deducted. The boiling point of water is still 100 ℃
Adopt
RELATED INFORMATIONS
- 1. The object moves upward from the bottom of the inclined plane with an initial kinetic energy of 200 joules. When it passes through the m point on the inclined plane, its kinetic energy decreases by 160 joules and its mechanical energy decreases by 64 joules If the object can return to the bottom, the kinetic energy of the object when it reaches the bottom is
- 2. When it rises to a certain point P, the kinetic energy is reduced to 10J, and the mechanical energy is lost by 10J. If the air resistance is constant, the object will be ejected vertically When it rises to a certain point P, the kinetic energy is reduced to 10J, and the mechanical energy is lost by 10J. If the air resistance is constant, then the air resistance is stable The gravitational potential energy at the highest point is? The answer is 40J What is the kinetic energy when landing? The answer is 20j Wrong type correction: throw the object vertically with the initial kinetic energy of 60j. When it rises to a certain point P, the kinetic energy is reduced by 30J, and the mechanical energy is lost by 10J. If the air resistance remains unchanged, then
- 3. When the extra work is less than the useful work, the mechanical efficiency of the machine is improved A. More than 0.5 B. Less than 0.5 C. Greater than 1 D. Equal to 0.5
- 4. The output voltage of one generator is 220 V and the output power is 110 kW When the output voltage of a generator is 220 V and the output power is 110 kW, and the electric energy is transmitted to a distance by a wire with a resistance of 0.3 Ω, the following questions are asked: (1) if the voltage of 220 V is directly transmitted, how much power is lost on the wire; (2) if the voltage is increased to 6000 V by a transformer before transmission, how much power is lost on the wire? The answer is 75000w and 100.83w. But there is no process I didn't understand this
- 5. When the resistance of a motor coil is r, the voltage at both ends is u and the current is I, the maximum mechanical power output of the motor is () A. UIB. I2RC. UI+I2RD. UI-I2R
- 6. In order to adjust the speed of DC motor, a variable resistor is often connected in series. In the circuit diagram, M is a small DC motor, which is marked with "12V, 24W", and the power supply voltage is 20V. When the motor works normally, (1) what is the resistance value of the variable resistor? (2) What is the total power supplied by the power supply and the power consumed by the variable resistor?
- 7. The electromotive force of the power supply is 12 V, the internal resistance is 1 ohm, R1 = 1, R2 = 6, R1 and R2 are in series, the motor and R2 are in parallel, and the motor resistance is 0.5 ohm The current in the closed circuit is 3a. Calculate the electric power consumed by the motor
- 8. The physical heat is generated. A motor can work normally. The voltage at both ends of the motor is 380V, the coil resistance is 2 Ω, and the current through the coil is 10A. The electric energy consumed by the motor in normal operation for 1s is__ J. What is the heat generated by the coil resistance__ J Don't be too detailed, just a simple formula, Voltage at both ends of coil when a motor works normally
- 9. Calculation of Ohm's law of resistance The resistance in the ammeter is very small, about 0.02 ohm. Can this ammeter be directly connected to the positive and negative poles of a dry battery? Please use calculation to answer this question
- 10. According to w = Qu, an electron is accelerated by an electric field between two points with a potential difference of 1 V, and the work done by the electric field force is 1 eV Is 1 eV positive or negative?
- 11. Does friction work to produce internal energy? When a pair of static friction forces do work, there is no internal energy in the system. When a pair of sliding friction forces do work, there will be internal energy in the system.
- 12. There is an electric furnace with a rated voltage of 220 v. if you want to connect it to the 110 V line without changing the power of the electric furnace, what should you do?
- 13. About electric power At present, there is a kind of electric energy meter, which is inserted after the user buys it, and the electric energy meter reads the amount in the card. Once the amount is used up, the electric energy meter will cut off the circuit. It needs to go to the bank to store the value for it, and then insert the electric energy meter again before it can be used. There is also a new type of electric energy meter, in which the electric energy is calculated by the internal electronic circuit, and its count is displayed (Note: the blank should be filled in)
- 14. The chemical quantity represented by each letter in chemistry Just as M is the mass and N is the quantity of matter Please do it in 26 letter order,
- 15. Letter symbols corresponding to chemical electrical instruments
- 16. What do 26 English letters look like? OK, I'll add 100 points
- 17. How do volume units be expressed in letters
- 18. Which of the following experiments can be performed in an orbiting space station A. measure the density of the meteorite with a balance; B. observe the onion slices with a microscope; C. measure the temperature inside the chamber with a thermometer D the gravity of the object on the side of the spring dynamometer e the grip strength of the astronaut with the spring dynamometer
- 19. Clay tile workers usually make it out of a small stone______ To check whether the walls are in good condition______ This is based on__________________________ It's made on the principle of
- 20. If an object is only affected by gravity, then A. It's possible to do curvilinear motion B. It can only move in a straight line at a constant speed C. It's impossible to change speed D. May remain stationary