Một động cơ nhiệt làm việc theo chu trình Cacnô có công suất P = 73.600W. Nhiệt độ của nguồn nóng là 1000 độ C nhiệt độ của nguồn lạnh là 0 độ C. Tính: a. Hiệu suất của động cơ.

b. Nhiệt mà tác nhân thu được từ nguồn nóng trong 1 phút.

c. Nhiệt mà tác nhân nhả cho nguồn lạnh trong 1 phút

Describe how the fermi level changes with donor level, temperature and contact with p and n type semiconductors

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)