Did I Expect Too Much?
ZapperZ (noreply@blogger.com)
In one of my exam questions, I gave the students the average radius of Earth's orbit around the Sun at 150 million km. I told them that we can assume that the orbit is circular. I even gave them the formula for the circumference of a circle.
The question then asked them to find the speed of the Earth as it moves around the Sun.
After the exam and after the results were published, a number of students told me that I did not give them enough information to solve the problem. They said that they...