Datexx 6518206 User Manual
Page 12
CIVIL ENGINEERING
In this right triangle,A = 5.7 feet and a = 30 degrees.
Determine the value of C.
sin a = A / C
sin 30 degrees = 5.7 / C
C = 5.7 / sin 30 degrees
C = 5.7 / .5
C = 11.4
Mode
Press
Display
DEG
5.7 [÷]
5.7
30 [sin]
.5
[=]
11.4
In this right triangle,
A = 6 feet and C = 15 feet.
Determine the values of a, b and B.
sin a = A / C
sin a = 6 / 15 = 0.4
sin–1 .4 = 23.58
a = 23.58 degrees
b = 90 – 23.58 = 66.42 degrees
cos a = B / C
cos 23.58 = B / 15
B = cos 23.58
×
15
B = .9165
×
15 = 13.7475 feet
23
APPLICATIONS AND EXAMPLES
BUSINESS
Calculate the future value of a $1000 investment
compounded annually at a rate of 6% for 7 years.
FV
=
p (1+i)n
=
1000 (1+0.06)7
=
1503.63
Press
Display
1 [+] 0.06 [=] [xy] 7[=]
1.503630259
[
×
] 1000 [=]
1503.630259
PHYSICS
If a ball is thrown upward with a velocity of 75 feet
per second, what is its velocity at the end of 1.6 sec-
onds (g=32.2 ft/sec2)?
Velocity:
V = Vo – gt
= 75 – (32.2
×
1.6)
= 23.48 ft/sec.
Height:
S = Vot – 1/2 gt2
= (75
×
1.6) – (1/2 x 32.2
×
(1.6)2)
= 78.784 ft.
Press
Display
75 [–] 32.2 [
Ч
] 1.6 [=]
23.48
75 [
Ч
] 1.6 [–] 2[1/x] [
Ч
]
0.5
32.2 [
Ч
] 1.6 [x2] [=]
78.784
22