The electrical circuit consists of a generator with a TEM of 15 V, an ammeter and a consumer of electricity with a resistance of 4000mΩ. The ammeter indicates the current intensity of 3 A. Determine the internal resistance of the generator. I will give a brainliest please helpp me

How much work is done lifting a 9.10 kg box straight up onto a shelf that is 1.80 m high?

Aspring has a relaxed length of 33 cm (0.33 m) and its spring stiffness is 6 n/m. you glue a 76 gram block (0.076 kg) to the top of the spring, and push the block down, compressing the spring so its total length is 15 cm. you make sure the block is at rest, then at time t=0 you quickly move your hand away. the block begins to move upward, because the upward force on the block by the spring is greater than the downward force on the block by the earth. calculate y vs. time for the block during a 0.09-second interval after you release the block, by applying the momentum principle in three steps each of 0.03-second duration.

When and why was the metric system invented?