Physics update 8/4

Hi folks,

We got a little mathy today as we took a look at how to solve some, slightly more complicated, acceleration problems. We also spent quite a bit of time looking at the many fascinating aspects of gravity.

Homework for next week is to practice your formulas by doing the following problems.  Answers are below (there are more answers than problems since I've removed some of the problems from the original homework).  Be sure you understand these.  They are the basis of many of the problems that will be coming soon.  

1. Whoops, you dropped your cell phone. Well…might as well do some physics.

a. If your cell phone dropped of a 10 m (30 ft) tall building how long will it take before it hits the ground?

b. What speed will your cell phone hit the ground at?

c. What average speed will your cell phone have during the fall?

d. What is the acceleration for your cell phone?

e. Create a velocity vs. time graph for your cell phone.  I do want to see data points for this, not just the shape. (Yay more graphs!!!)

f. Create an acceleration vs. time graph for your cell phone. I do want to see data points for this, not just the shape.

g. Create a distance vs. time graph for your cell phone.  I do want to see data points for this, not just the shape.

2.  A little baseball here.

A pitcher is able to throw a pitch at 45m/s (about 100 mph).

The pitch itself takes 0.1 seconds to throw.

Home plate is 18.4 m (60.5 ft) from the pitcher.

a.  What is the acceleration of the pitch?

b.  How long does it take the pitch to get to home plate?

Also Read Conceptual Physics pgs. 168 - 177
Do the Think and Explain questions on pg. 27 #'s 1-8

Do the Plug and Chug problems on Pgs 26 and 27 #'s 1-6