Answer:
390 J
Explanation:
m = 3 kg
u = 16 i + 2 j
(a) Magnitude of velocity = 
= 16.1245 m/s
KEi = 1/2 m v^2 = 0.5 x 3 x 16.1245 = 390 J
(b) v = 18 i + 14 j
Magnitude of velocity = 
= 22.804 m/s
KEf = 1/2 m v^2 = 0.5 x 3 x 22.804 = 780 J
According to the work energy theorem
Work done = change in KE = KEf - KEi = 780 - 390 = 390 J
Birth rate 10/1000 = +population
Death rate 9/1000 = -population
Immigration rate 3/1000 = +population
Emigration rate 7/1000 = -population
10/1000 - 9/1000 + 3/1000 - 7/1000= -3/1000
Growth rate = (-3/1000)(100%)= -0.3%
Via half-life equation we have:
Where the initial amount is 50 grams, half-life is 4 minutes, and time elapsed is 12 minutes. By plugging those values in we get:
There is 6.25 grams left of Ra-229 after 12 minutes.
Answer:
400kj
Explanation:
h =mass × specific heat capacity × change in temperature
= 2×2000×[120-20]
=2×2000×100
=400000j
=400kj
(a) For constructive interference the two waves will have higher amplitude of 10 cm.
(b) For destructive interference the two waves will have zero amplitude.
<h3>
Amplitude of the waves for constructive interference </h3>
For constructive interference the two waves will have higher amplitude after constructive interference.
Resulting amplitude = 5 cm + 5cm = 10 cm
<h3>
Amplitude of the waves for destructive interference </h3>
For destructive interference the two waves will have zero amplitude after destructive interference.
Resulting amplitude = 5 cm - 5cm = 0
Learn more about amplitude here: brainly.com/question/413740
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