Sebuah segitiga siku-siku memiliki panjang sisi tegak 6 cm dan 8 cm. Berapakah panjang sisi miringnya?
Answer (3)
Technically, if your question refers us to a diagram, then you owe us a peek at the diagram. But there may be enough info in the description to solve this one blind.
Newton's second law of motion: F = M A "The force on an object is the product of the object's mass and its acceleration."
Divide each side by 'A': A = F / M "The rate at which an object accelerates is its mass divided by the force on it." Hold that thought for a moment, while we go off on a tangent:
Everybody talks about "kg" as if it were a force, and this question shows why that's a terrible thing to do. In this question, "kg" is used BOTH as a mass AND as a force. I can't think of a better way to confuse students who are just now working with this stuff for the first time. The question is badly written, although, in the real world, scales do read in 'kg'. "Kg" is a mass. It is not a force.
I think that rather than try to teach more physics to get out of this hole, the best way to go at it is like this:
If the scale were sitting still, on the ground, or rising at a steady rate and not accelerating, then the only force on the 10 kg mass would be the force of gravity, and the scale would read '10 kg'. But in the upward-accelerating elevator, the scale reads 20% more, telling us that 20% more than the force of gravity is acting on the mass. That extra 20% of upward force is provided by the upward acceleration, which must be 20% of the acceleration of gravity. The acceleration of gravity is 9.8 meters per second² . The elevator is accelerating (0.2 x 9.8) = 1.96 meters per second² .
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The acceleration of the elevator is approximately 1.96 m/s² upward, calculated using the differences in forces acting on the sack of potatoes. The scale reading reflects both the weight of the sack and the additional force due to the elevator's acceleration. Newton's second law allows us to derive the acceleration from these forces.
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Jawaban:Sisi miring panjangnya 10 cm.Penjelasan dengan langkah-langkah:Segitiga siku2 dengan sisi tegak 6 cm dan 8 cm.Sisi miring = √(6²+8²) = √(36 + 64) = √100 = 10 cm.
