Physics:)

Hello ladies and gents...

We did answer the Study Guide Chapter 11 which is the "Energy in its Forms" and the "Conservation of Energy." We also went over on the assignment from the green book that Ms. Kozoriz gave us yesterday.

Here are the solutions in the 7 questions in Green Book:

1) KE= 1/2mv^2
= 1/2(1600kg)(12.5m/s^2)
= 1.25x10^5J

2) KE= 1/2mv^2
*108km/h= 30m/s^2

= 1/2(1500)(30m/s^2)
=6.75x10^5J

6 a)v2^2=v1^2+2ad
62m/s^2=0^2+2a(22.0m)
3844m/s=2a(22.0m)
a = 87.36m/s^2

6 b)KE= 1/2mv^2
=1/2(40)(62)^2
=76880J

12 PE= mgh
= 60kg (9.8m/s^2)(3.5m)
= 2058J or 2.1x10^3J

13) PE= mgh
= 64kg (9.8m/s^2)(2.1m)
= 131.72J

20 a) W=F.d
=98N (50m)
=4900N.m

20 b) PE= mgh
= Fh
=98N (50m)
=4900J

20 c) W= KE
= F.d
=98N(50m)
=4900N.m

22 a) KE= F.d
= 1/2mv^2
= 201kg(1.3m/s)
1/2 = mv^2 =261.3
v2 = 261.3/.15
= 1742m/s(Find the square root)
= 41.73 or 42m/s

20b) v2^2=v1^2+2ad
d =0-(42^2)/2(9.8m/s)
=90m

After the discussion, Ms. Kozoriz gave us another work sheet which is the "Work and Energy: Springs"



Jape is the next scriber...