Answer: b
. Natural selection is a process that brings about evolution
Explanation:
The natural selection can be defined as the differential survival and reproduction of the organisms that have better phenotypic traits which allow them to survive in their changing environment. These traits are passed on to the next generation this process is necessary for the evolution of the species. The evolution is the change in the structure and function of the organisms with the passage of them.
(a) The system of interest if the acceleration of the child in the wagon is to be calculated are the wagon and the children outside the wagon.
(b) The acceleration of the child-wagon system is 0.33 m/s².
(c) Acceleration of the child-wagon system is zero when the frictional force is 21 N.
<h3>
Net force on the third child</h3>
Apply Newton's second law of motion;
∑F = ma
where;
- ∑F is net force
- m is mass of the third child
- a is acceleration of the third child
∑F = 96 N - 75 N - 12 N = 9 N
Thus, the system of interest if the acceleration of the child in the wagon is to be calculated are;
- the wagon
- the children outside the wagon
<h3>Free body diagram</h3>
→ → Ф ←
1st child friction wagon 2nd child
<h3>Acceleration of the child and wagon system</h3>
a = ∑F/m
a = 9 N / 27 kg
a = 0.33 m/s²
<h3>When the frictional force is 21 N</h3>
∑F = 96 N - 75 N - 21 N = 0 N
a = ∑F/m
a = 0/27 kg
a = 0 m/s²
Learn more about net force here: brainly.com/question/14361879
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Hello there
the answer is hot pot
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well hope this halps have a great day :p
Answer:
a) Angular frequency, w = 0.0184 rad/s
b) Amplitude of vibration = 245 m
Explanation:
a) Angular frequency, w = 2πf
f = 1/T, T = 5.7 minutes = 5.7 × 60 = 342 s
f = 1/342 = 0.00292 Hz or 0.00292/s
w = 2π (0.00292) = 0.0184 rad/s
b) Amplitude of simple harmonic motion,
displacement of simple harmonic motion, x(t) = A cos (wt-Φ)
A = amplitude
v = dx/dt = - Aw (sin (wt - Φ)
Velocity amplitude of simple harmonic motion = Amplitude × angular frequency
Amplitude = (velocity amplitude)/(angular frequency) = 4.5/0.0184 = 245m
Hope this Helps!!!
Is this a trure/false? if it is then it is true
