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What does w mean in physics?
If W is on the left side of the equation,
For example, w = 15 J. in this formula, w means work
If it's written on the right, for example, power P = 50W, then w is a unit, which means watt
You should be previewing the content of the third day of junior high school. Don't confuse it!
What is the meaning of "control variable method" in physics?
In physics, the method of controlling factors (variables) is often used to change a multi factor problem into a multi single factor problem. Each time, only one of the factors is changed, and the other factors are controlled to remain unchanged, so as to study the influence of the changed factor on things, study it separately, and finally solve it comprehensively, This method is called control variable method. It is an important thinking method in scientific inquiry, It is widely used in all kinds of scientific exploration and experimental research. Control variable method is one of the scientific methods commonly used in junior high school physics to explore and analyze problems Explore the loudness and tone of sound, ideal inclined plane experiment, explore the relationship between force and motion, explore the factors that affect the size of sliding friction, explore the factors that affect the effect of pressure, explore the factors that affect the size of liquid pressure, explore the factors that affect the size of buoyancy, explore the factors that affect the mechanical efficiency of pulley block, explore the factors that affect the size of kinetic energy, explore the influence factors The factors that affect the size of the potential energy of gravity, the factors that affect the size of the resistance of the conductor, the verification of Ohm's law, the factors that affect the amount of work done by the current, the factors that affect the thermal effect of the current, and the factors that affect the magnetic strength of the electromagnet
How do you define time in physics?
Under the current international system of units, the 13th International Conference on weights and measures held in 1967 defined the second as the duration of 9192631770 cycles of radiation corresponding to the transition between two hyperfine energy levels of the ground state of cesium 133, [1] in this case, the second defined is equivalent to the second defined in astronomical almanac. The international standard symbol of second can refer to en: ISO 31-1.from wiki
What is m in physics
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