Air Resistance and chapter five review

Today in school, we had a sub. We corrected falling and Air Resistance and chapter five review. Here is the answers for the two work sheets.

Falling and Air Resistance
1.most
2.a,b
3.d,e
4.still downward
5.c,f
6.c,f
7.c
8. greater
a.10 m/s²
b.6 m/s²
c.0 m/s²
d.-2 m/s²
e.-10 m/s²
f.0 m/s²

Chapter 5 Review

1.a=f/m
20n/70kg=.286 m/s²

2.m=f/a
m=125n/25m/s²=5.0kg

3.d=(v1+v2/2)t
v2=133 m/s
a=v/t
a=133/3=44.4m/s²
f=ma
f=500kg x 44.3m/s²=22150n

4.d=(v1+v2/2)t
t=2xd/v2
t=0.083s
a=v/t
a=(12 m/s)/0.083
a=144 m/s²
f=ma
f=1.0kgx144 m/s²=144n

5.a=f/m
a=-40.0/75=-0.53 m/s²

6.fg=mg
fg=68kgx9.8n/kg
fg=-670n
next scribe is Shasta

Sound test

Hi

First Mrs. K gave us the lab and the test back. After that we had to correct our test and I have the correct answer.

1.V=332m/s+(0.6)(30)
V=332+18
V=350m/s

2.a)10°C b)30°C

v=332m/s+(0.6)(10) v=332m/s+(0.6)(30)
v=338x12.3s v=350x12.3

v=4157.4m/s v=4305m/s

3.a)60db
60-50 10x
50-40 10x

100x

b)10db
40-30 10x
30-20 10x
20-10 10x
1000x

4.compression and rarefaction of air particles

5.no

6.f=30beats/5.0s

f=6Hz

256-6=250Hz

256+6=262Hz

7.The soldiers marching in step has the same frequency as the bridge and they must march out of step.

8.the air column is getting smaller,the (y) is shorter and the frequency increases resulting in a higher pitch

9.)256/2=128Hz

10.

11.leaving your position

12.a)5/4x256=320Hz

b)6/4x256=384Hz

significant figures

S = Significant
N = Not Significant

1.)

A. S, 2

B. S, 1

C. N, 4

D. N, 4

E. S, 2

F. S, 3

G. S, 1

H. N, 4

2.)

A. 2

B. 4

C. INFINITE.

d.2

e.3

F. 3

G. 3

H. 7

I. 4

J. 3

K. 2

L. 3

M. 3

N. 2

O. 5

P. 1

Q. 3

R. 3

S. INFINITE.

t.4

U. 5

V. 3

W. 3

X. 3

Y. 1

Z. 4

Next scribe is Niwatori-san