Taking motion towards East as +ve ....
(0.65kg x 3.0m/s) + (0.65kg x - 2.0m/s) = 0.65 kg.m/s
(0.65 x v?) + (0.65 x - 1.50) = 0.65(v - 1.50)
By conservation .. before = after
0.65 = 0.65(v - 1.50)
1 = (v - 1.5) .. .. ►v = (+) 2.50 m/s (East)
C :) cause a direction has nothing do do with velocity !
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Answer:</h2>
1750N/m
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Explanation:</h2>
According to Hooke's law, the spring constant (k) of an elastic material is the ratio of the force (F) applied to the material to the extension (x) of the material caused by this force. i.e
k = F / x --------------(i)
From the question, the elastic material (spring) of 25 coils has a spring constant of 350N/m. This means that for every 350N force applied to the spring, the spring extends by 1m.
Now if the spring is cut into five equal parts each with five coils, imagine they are attached together such that the same force of 350N is applied to still cause a total extension of 1m. Each spring contributes 1/5 of this extension.
Therefore, the extension caused by each spring is 1/5 of 1m = 0.2m
Since the same force of 350N is applied, substitute F = 350N and x = 0.2m into equation (i) as follows;
k = 350 / 0.2
k = 1750N/m
Therefore, the spring constant of each of the 5-coil spring is 1750N/m
Weight is a force, so we use newtons second law which states F=ma. So the weight of a watermelon on earth is 2kg x 9.81m/s², which is 19.62N (newtons). On the moon it weighs 2 x 1.63 which is 3.26N.
The weight of the pen is 0.02 x 9.81, which is 0.1962N. If the pen is not to fall the frictional force needs to be equal to this force, so the answer is 0.1962N.
Answer:
Solution given:
frequency[f]=60,500,000Hz
velocity[V]=300,000,000m/s
wave length=?
we have
wave length=
=
==4.96 m
Option A.4.96m