Question

1. The time derivative of a unit vector is itself

   		a unit vector.
   		a scalar less than one.
   		a scalar greater than one.
   		a vector of any magnitude depending on the details of the problem.

4 points   

QUESTION 17

1. While the earth obviously can't be placed on a scale, it can easily be determined by measuring its own orbital period around the sun (and knowing the distance to the sun).

   True

   False

4 points   

QUESTION 18

1. At the top of a Ferris wheel in motion, you tend to feel lighter due to the fact that you are farther from the earth where gravity is weaker.

   True

   False

4 points   

QUESTION 19

1. Assuming there are currently 365 days in a year (ignoring the fact that it's not an integer in reality), how long (in days) would a year be on earth if we were twice as far from the sun?

4 points   

QUESTION 20

1. What is the maximum lateral acceleration (in standard units) possible for a car on an un-banked road with tires having a friction coefficient of 1.1?

Answer 1