Newton’s prism experiments showed that white sunlight is made up of ... A-the full electromagnetic spectrum.. B-only blue light.
2 answers:
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Answer:
question5: F=74312.5N
question6: charge at the end of antenna=0.37N
Explanation:
Coulomb's law: the magnitude of the force of attraction or repulsion due to two charges is proportional to the product of the magnitude of the charges and inversely proportional to the square of distance between the charges.
⇒
∴
where is the force of attraction or repulsion
is Coulumb's constant=
and
are the magnitude of the charges
is the distance between two charges
The force between the two charges is attractive if they are of different polarity
The force between the two charges is repulsive if they are of same polarity
Question5:
Given: q1=0.041 C, q2=0.029 C, r=12 m
therefore by Coulumb's law,
Question6:
Given: q1=, r=5 m, F=
therefore by Coulumb's law,
⇒
Answer:
Explanation:
We can solve this problem using conservation of angular momentum.
The angular momentum is
where is the position and
the linear momentum.
We also know that the torque is
but, as the linear momentum is this means that is parallel to the velocity, and the first term must equal zero
so
But, as the only horizontal force is the tension of the string, the force must be parallel to the vector position measured from the vertical rod, so
this means, for the angular momentum measure from the rod:
that means :
So, the magnitude of initial angular momentum is :
but the angle is 90°, so:
We know that the distance to the rod is 0.750 m, the mass 2.00 kg and the speed 5 m/s, so:
For our final angular momentum we have:
and the radius is 0.250 m and the mass is 2.00 kg
but, as the angular momentum is constant, this must be equal to the initial angular momentum