风能

• 我什么时候能够访问课程视频和作业？

  讲座和作业的访问权限取决于您的注册类型。如果您以旁听模式参加课程，则可以免费查看大多数课程资料。要访问评分作业并获得证书，您需要在旁听期间或之后购买证书体验。如果看不到旁听选项：

  • 课程可能不提供旁听选项。您可以尝试免费试用，也可以申请助学金。
  • 课程可能会改为提供'完整课程，没有证书'。通过此选项，您可以查看所有课程材料、提交所要求的作业，以及获得最终成绩。这也意味着您将无法购买证书体验。

• 我购买证书后会得到什么？

  您购买证书后，将有权访问所有课程材料，包括评分作业。完成课程后，您的电子课程证书将添加到您的成就页中，您可以通过该页打印您的课程证书或将其添加到您的领英档案中。如果您只想阅读和查看课程内容，可以免费旁听课程。

• Is financial aid available?

  是的，Coursera 可以向无法承担学费的学生提供助学金。点击左侧‘注册’按钮下的‘助学金’链接即可申请助学金。您可以根据屏幕提示完成申请，申请获批后会收到通知。了解详情。

• Aerodynamics, how to find the right values of a and a'?

  1.The formula for finding x = ({Omega}* R )/v_0

  2.Solve[16 a^3 - 24 a^2 + a (9 - 3 x^2) - 1 + x^2 == 0, a]

  3. a is in interval (0<a<1)

  4. a' = (1 - 3 a)/(4 a - 1)

• How many numbers after comma I should enter?

  Coursera takes in unlimited about of numbers after comma, but we suggest you enter by approximation of 0.01, in cases where the answer is larger then 10000, the decimals are not necessary.

• Economics: Having problems with negative values!

  All answers are asked to be entered in absolute value.

• Economics: I am having problems with calculating NPV!

  You have included the present value of the decommissioning cost in the NPV calculation. We have not asked you to do that, so that is why answer is outside the range, but including these costs could also be done, so you are not entirely wrong.

還有其他問題嗎？請訪問 學生幫助中心。