Answer:
A. 0.0450
B. 4
C. 0.25
D. 37.68
E. 6Hz
F. -0.523
G. 1.5m/s
H. vy = ∂y/∂t = 0.045(-37.68) cos (25.12x - 37.68t - 0.523)
I. -1.67m/s.
Explanation:
Given the equation:
y(x,t) = 0.0450 sin(25.12x - 37.68t-0.523)
Standard wave equation:
y(x, t)=Asin(kx−ωt+ϕ)
a.) Amplitude = 0.0450
b.) Wave number = 1/ λ
λ=2π/k
From the equation k = 25.12
Wavelength(λ ) = 2π/25.12 = 0.25
Wave number (1/0.25) = 4
c.) Wavelength(λ ) = 2π/25.12 = 0.25
d.) Angular frequency(ω)
ωt = 37.68t
ω = 37.68
E.) Frequency (f)
ω = 2πf
f = ω/2π
f = 37.68/6.28
f = 6Hz
f.) Phase angle(ϕ) = -0.523
g.) Wave propagation speed :
ω/k=37.68/25.12=1.5m/s
h.) vy = ∂y/∂t = 0.045(-37.68) cos (25.12x - 37.68t - 0.523)
(i) vy(3.5m, 21s) = 0.045(-37.68) cos (25.12*3.5-37.68*21-0.523) = -1.67m/s.
Answer:
A. using a hook in his opening
B. detailing the speech’s objectives
E. letting his audience know what to expect
Explanation:
Opening his speech using a quotation is a strategy of using a narrative hook, or simply hook, by Ian. Giving a grand and enticing opening is what makes an audience to pay attention and listen to what the speaker has to say in his speech. So, first strategy used by Ian is using a hook in his opening.
Another strategy used by Ian is giving objective details of his speech. By outlining what he will be covering in his speech, Ian is letting his audience know what to expect from the speaker and his speech, and also gave details of his speech.
So, option A, B, and E are correct.
Answer: a profession is a job, or what you do for a living
example : a teacher is an example of proffesion
People can use software to make their lives more enjoyable
