Which of the following is a balanced equation?

A.
Na2S + 2KCl → 2NaCl + K2S

B.
LiCl + 2H2O → 2HCl + Li2O

C.
2KBr + 2CaO → K2O + CaBr2

D.
NaCl + H2O → NaO + 2HCl

Complete the sentence to describe the law of conservation of energy. the law of conservation of energy states that energy cannot be created or , but it can be

Asilver dollar is dropped from the top of a building that is 1324 feet tall. use the position function below for free-falling objects. s(t) = −16t2 + v0t + s0 (a) determine the position and velocity functions for the coin. s(t) = v(t) = (b) determine the average velocity on the interval [1, 2]. ft/s (c) find the instantaneous velocities when t = 1 second and t = 2 seconds. v(1) = ft/s v(2) = ft/s (d) find the time required for the coin to reach the ground level. (round your answer to three decimal places.) t = s (e) find the velocity of the coin at impact. (round your answer to three decimal places.) ft/s

Which planets are visible without a telescope