En una película de vaqueros, el muchacho busca cierta información que puede darle el herrero. Mientras hablan, éste prepara una herradura para colocársela al caballo del muchacho. La herradura es de hierro de 0.40 kg y está sobre un fogón. El herrero la retira y la echa en un tacho con 10 kg de agua. Como es un día frío, el agua está a unos 10 0 C y luego de que llega al equilibrio térmico con la herradura, la temperatura es de unos 12.4 0 C. El muchacho, curioso, le pregunta al herrero “¿qué temperatura tiene la herradura cuando la saca del fuego?” El herrero se sonríe y le contesta “averígualo” ¿puedes ayudarlo?

Jason and mia are both running in a race. as they approach the finish line, you being the physicist that you are decide to time how long it takes them to reach the end of the race. when you start your stop watch (you can take this as time t = 0 s) you notice that mia is an unknown distance d ahead of jason and both are moving with the same initial velocity v_0. you also notice that jason is accelerating at a constant rate of a_j, while mia is deaccelerating at a constant rate of -a_m. jason and mia meet each other for the first time at time t = t_1. at this time (t = t_1) jason's velocity is two times that of mia's velocity, meaning v_j (t_1) = 2v_m (t_1). a) draw the position vs. time graph describing mia's and jason's motion from time t = 0 to time t = t_1. clearly label your axes and initial conditions on your graph. b) draw the velocity vs. time graph describing mia and jason's motion from time t = 0s to time t = t_1. clearly label your axes and initial conditions on your graph. c) how long from when the stop watch was started at t = 0s did it take mia and jason to meet? express your answer in terms of know quantities v_0, a_m, and a_j. d) when the stop watch started at time t = 0s, how far apart, d, were mia and jason? express your answer in terms of know quantities v_0, a_m, and a_j.

Which of the following is not a characteristic of s waves? a. travel slower than p waves. b. cannot be detected in locations more than 105° from an earthquake’s epicenter. c. travel through solids and liquids. d. only affect coastal regions.

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?