<u>Answer</u>
1/4
<u>Explanation</u>
half life = 15 years
decay period = 30 years
The number of half-lives = 30 ÷ 15
= 2 half lives
1 ⇒(<em>after 1st half life</em>) ⇒ 1/2 ⇒ (<em>after 2nd half life</em>) ⇒ 1/4
The fraction that remained is 1/4.
Answer:
Explanation:
<u>First person:</u>
the rock is dropped
after t1 seconds it hit the ground, y(t)=0
<u>Second person:</u>
the rock has a initial downward speed
after t2 seconds it hit the ground, y(t)=0
the time t when the second person throws the rock after the first person release the rock is:
t=t1-t2
Answer:
Horizontal Motion, and Vertical Motion.
Explanation:
A is the answer to your question
20 minuets is 1/3 of an hour so you multiply 30 km by 3 and get 90 km/hr
Answer:
327.58 kPa
Explanation:
Given data; 1st wave
Amplitude ( A1 ) = 293 Kpa
frequency = 6Hz
Average stress = 2388kPa
phase angle = 90° ( leading )
<u>Determine the amplitude of the second sinusoidal component in kPa </u>
Amplitude of additional wave ( A2 ) = 293 / 2 = 146.5 kPa
Amplitude of first wave ( A 1 ) = 293 kPa
hence the amplitude of the second sinusoidal component
A' =
=
=
= 327.58 kPa