Một vật được thả rơi từ một khí cầu đang bay ở độ cao 300 m. Hỏi sau bao lâu vật rơi xuống mặt đất, nếu:
a. Khí cầu đang bay lên theo phương thẳng đứng với vận tốc 5 m/s.
b. Khí cầu đang hạ xuống theo phương thẳng đứng với vận tốc 5 m/s.
c. Khí cầu đang đứng yên

Which lists the pairs of plates in order from least to greatest in terms of the work done to move the electron?

Since the energy was not raising the temperature of the water during these segments, what was the energy used to do instead? your answer must include an explanation of what is happening to the molecules.

Which of the following best describes internal energy? a. the difference between the kinetic and potential energies of the particles in a system b. the sum of the kinetic and potential energies of the particles in a system c. the sum of the kinetic and thermal energies of the particles in a system d. the difference between the kinetic and thermal energies of the particles in a system