Una barra caliente de cobre cuya masa es de 1.5 kg se introduce en 4 kg de agua elevando su temperatura de 18°C a 28°C. ¿Qué temperatura inicial tenía la barra de cobre?

Write a question about how changing temperature affects the gas inside the sports ball

Each neuron shown in this figure innervates a group of muscle fibers. what is the term for a group of muscle fibers innervated by a single neuron?

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=