HW

HW for B block class:

Review the ideas of basic unit conversions.  Do these, looking up equalities as needed:

1.  10 inches = ____ m

2.  5 m = ____ km

3.  30 ft = ____ miles

4.  4 seconds = ____ hours


Now come up with your own "conversion factors", using the technique illustrated in class:

5.  1 m/s = ____ feet/year

6.  1 mile/hour = ____ feet/fortnight

* A fortnight is 14 days.

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HW for C block class.

Play around with this.  It simulates the length of days (of sunlight) based on the day of the year.  It is related to the conversation we had today.

http://astro.unl.edu/naap/motion3/animations/sunmotions.swf


Also, we will be discussing unit conversions (now that you know a little about units).  Convert these units:

1.  30 inches = ____ feet

2.  30 inches = ____ yards

3.  30 inches = ____ miles

Recall that there are 5280 feet per mile.

4.  Now try this.  Usain Bolt is widely regarded as the fastest man alive.  He ran 200 m in 20.40 seconds, which is an average speed of 9.8 m/s.  Try to convert this speed to miles/hour.

You may need to know that there are 1609 meters in 1 mile.