Pier 1篑1 Branch 1: W with 1 Henan Luyang City Zhongyuan Oilfield Oil Production Plant 5 (457001) Wang Zhongqiu Yellow Scale is a measuring force instrument, but as long as we are good at brains, the bomb also has another magical effect, the following examples Explain the case 1 To know the quality of an object, there is no balance on the hand, only a spring balance, how to measure its quality, method: use the spring balance to measure the gravity G of the object, according to the relationship between gravity and mass G = mg, You can calculate the mass of the object. Example 2 There is no measuring cylinder. How to measure the volume of an irregularly shaped iron block with a spring balance. Method: Measure the gravity G of the iron block with a spring balance. According to the formula G = =, the iron piece can be obtained. Volume measurement area.
According to the map layout of a certain area, can you measure the actual area of ​​the area with a yellow scale? Method: Copy the map of the area on a wooden board with a density of / and thickness d, and use a knife to not The part belonging to the area is cut off, and the gravity of this part is measured by the spring balance as G, and the map area is S', and the s'= is obtained by G=S2 and the actual area S of the area is proportional to Rolling copper wire, you need to determine its length, but you can't pull the copper wire apart, and you can't cut the copper wire. Please tell us how to measure. Method: Pull out a piece of copper wire, wrap a few turns around the pencil, measure the total length of the coil, divide by the number of turns, and obtain the diameter of the copper wire. Use a spring balance to measure the gravity of the copper wire. G. Set L Indicates the total length of the copper wire, then the volume of the copper wire is V=7t(dl2)2L. The density of copper from the density meter is P, then the number of copper wires, you can quickly know the quantity by using the spring scale, method: Use the spring balance to measure the gravity G of the pile of rubber washers, count them from the pile of rubber washers, and measure the gravity G with a spring balance. Then the number of the rubber washers is n. How to use spring balance, beaker, water, fine Line measurement of solid and liquid density, if the solid density is greater than the density of water, the measurement method is: first measure the solid gravity G by spring; then immerse the solid in water to measure the apparent weight G'; calculate the buoyancy of the object Fs=G -G', from which the volume V = (GG) / j water g is calculated, substituted into the density formula (= m / V, can be obtained = GP water if the solid density is less than the density of water, the measurement method is: first use spring Check the gravity G of the solid; then hang the heavy object under the measured object, and only immerse the heavy object in the water to measure Heavy G'; immerse the weight and solid together in water, measure the apparent weight G"; calculate the buoyancy of the solid = G' solid volume equals the volume of the water it discharges V = (G' - the solid to be tested Density p=(3) The method for measuring the density of the liquid is as follows: first measure the gravity G of the solid with a spring; then immerse the solid in water to measure the apparent weight G'; then immerse the solid in the liquid to measure the apparent weight (T; The buoyancy of solids in water and liquid is: respectively, so /7, measuring mechanical efficiency. Example 7 If there is no scale, how to use the spring to measure the mechanical efficiency of the pulley block. Method: measure the gravity of the hook code with a spring balance G, then count the number n of the ropes connected to the moving pulley, and read the number F of the spring balance when the hook code is raised at a constant speed, according to: when the weight is raised//, the distance of the pulling force is S=M, derivation Example 8 has an iron workpiece. I don't know if it contains air bubbles. How to use a spring scale for identification. Method: First measure the weight G of the workpiece in the air and the apparent weight G' immersed in the water with a spring balance, and then according to Archimedes. Principle fV = row to find the volume of the workpiece assumed solid iron work The volume is V, from G=% and it can be concluded that P iron g is V'>V, the iron workpiece is hollow if V'=V, the iron workpiece is solid. Measure the weight of the elephant. Hangzhou TV has A science and technology column called "Impossible Tasks", in early June 2001, this column introduced such a problem. Who can use the smallest scale to give the elephant a weight of 4,000 yuan in prize money., Hangzhou Caihe Middle School Physics The teacher Zhou Yi ordered the crane to slowly ascend, and the iron cage gradually left the ground. Zhou Hao grabbed the empty space and slammed the spring down. His strength reached the limit and the whole body was about to vacate. It started, the 12m long balance bar finally balanced in people's screams.
According to the formula, the total quality comes out, and then the quality of the iron cage is subtracted. The actual quality of the elephant "Bin Law" is 2.4t. This is similar to the estimate of the zoo staff.
This is a very interesting question. It can be solved by using the principle of leverage. Can you think of Zhou Xi’s design plan? Attached: Zhou Wei’s design plan is: Think of this 12m long scale as a lever, according to calculation The resistance arm of this lever is 5cm. He wants to weld a hoop at a distance of 5cm from the fulcrum. It is equivalent to the button of the scale. When it is said, hook it with a crane, and the power arm is 6m. He hangs a spring balance at the lower end of the power arm, and when the crane lifts the elephant's B-inch. He pulls up the spring balance until the rod is pulled horizontally, then the reading displayed on the spring scale comes out, and then, according to the lever balance condition, that is, the power multiplied by the power arm = total weight multiplied by the resistance arm is derived, a conversion You can get the weight of the elephant. (:2002-03-06)
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