The angle of refraction of the light ray as it enters the transparent block from air = 20 degrees
Calculate the absolute index of refraction from the medium of the transparent block
0.2 m/s
125 m/s
25 m/s
Answer:
5.0 m/s
Explanation:
Distance/Time Taken
B. Hold and feed the infant while you supervise the activity of the older children.
C. Have the older two children continue the project on their own while you feed the infant in a separate room.
D. Prop the infant's bottle in the crib so he or she can eat while you continue to help the older children
Answer: B. Hold and feed the infant while you supervise the activity of the older children.
Explanation: On one side, a two-month-old is too young to understand that he has to wait until you finish with your other activities so you are free to feed him. His needs are urgent. Of course he is also too young to take the bottle on his own. These are the reason why options A and D are incorrect. On the other side, the other two children also need your supervision. You have to take care of them and leave them alone is not a good option. This is why option C is incorrect. Taking all these things into account I find option B as the best answer.
K = 9.00 × 109 N ×
r = 3.0 m, determine F.
_____ N
The force is obtained from the charges Q₁ = 3×10⁻⁵ C and Q₂ = 4×10⁻⁵ C and distance r = 3 m is 1.2 N.
Coloumb's law is defined as the force of attraction and repulsion between two charges is directly proportional to the product of charges and inversely proportional to the square of the distance between them.
The attractive and repulsive force, F∝ (q₁×q₂) / r². It is also known as F = k (q₁×q₂) / r², where k is the proportional constant. The unit of force is newton N.
From the given,
Q₁ = 3×10⁻⁵ C
Q₂ = 4×10⁻⁵ C
r = 3m
k = 9×10⁹ Nm²C⁻²
The attractive and repulsive force,
F = k (q₁×q₂) / r²
= (9×10⁹× 3×10⁻⁵×4×10⁻⁵) / (3)²
= 12×10⁻¹
= 1.2 N
Force = 1.2 N
Thus, the force of repulsion and attraction of given charges is 1.2 N.
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