Answer:D) Egocentrism
Explanation:
Mr.Tong should be alerted to Piaget's concept of Egocentrism which is under the pre operational stage of Piaget's theory.
Following are the key features of Pre operational stage
- Centration
- Egocentrism
- Play
- Symbolic Representation
- Pretend (or symbolic) Play
- Animism
- Artificialism
- Irreversibility
The feelings and actions of children are usually self-centered. Egocentrism refers to the failure of the child to see a situation from another person Perception.
The self-centered child believes that other people see, hear, and feel exactly the same as the child does, according to Piaget.
Here Also 5 year old daughter does not think about her father and ask question blatantly
Answer:
(A) 0.2306 m
(B) 1.467 Hz
(C) 0.1152 m
Explanation:
spring constant (K) = 16.4 N/m
mass (m) = 0.193 kg
acceleration due to gravity (g) = 9.8 m/s^{2}
(A) force = Kx, where x = extension
mg = Kx
0.193 x 9.8 = 16.4x
x = 0.1153 m
now the mass actually falls two times this value before it gets to its equilibrium position ( turning point ) and oscillates about this point
therefore
2x = 0.2306 m
(B) frequency (f) = \frac{1}{2π} x 
frequency (f) = \frac{1}{2π} x 
frequency = 1.467 Hz
(C) the amplitude is the maximum position of the mass from the equilibrium position, which is half the distance the mass falls below the initial length of the spring
= \frac{0.2306}{2} = 0.1152 m
The heaviest planet in the world is Jupiter!
Three
The ray of light will come out of the glass at 90 degrees to the normal. What goes in is called the critical angle. At 90 degrees the ray will reflect rather than refract. This is just for interest.
<em><u>Formula</u></em>
n2 * sin(θ2) = n1* sin(θ1)
<em><u>Givens</u></em>
θ2 = 90 degrees
n2 = 1
n1 = ?
θ1 = 43.6
<em><u>Solution</u></em>
n1 * sin(43.6) = 1 * 1
n1 = 1/sin(43.6)
n1 = 1/0.6896
n1 = 1.45
Four
This problem is very instructive. It uses a little known trick so that you don't have to know the exact speed of light of one of the speeds. The other speed is compared to it. You could do it the long way and figure out the speeds in crown glass from air to the crown glass, and do the same thing with the other color. That would work. An easier way is not to bother. Call the speed of one of the colors = 1. Is the other speed greater or less than 1? We'll see.
The next thing you have to realize is that the speed is going to be highest for either red or violet. That's because n is highest for violet and lowest for red. The intermediate colors don't matter. So the answer is either A or B.
They have n's between violet and red and so they will not be an answer. That means you can eliminate green and yellow (answers C and D).
<em><u>Formula</u></em>
v1/v2 = n2/n1
<em><u>Givens</u></em>
v1 = 1 (we'll say this is red)
v2 = ? (this is violet)
n2 = 1.62 for red. This is probably not exact, but it does not have to be. You just have to notice that violet is higher
n1 = 1.65 for violet. So you are trying to solve the relative speed of v2.
<em><u>Solution</u></em>
v1/v2 = n2/n1
1/v2 = 1.65/1.62 Cross multiply
1.65 * v2 = 1 * 1.62 Divide by 1.65
v2 = 1.62/1.65
v2 = 0.98
<em><u>Conclusion</u></em>.
The speed of violet is going to be slower than the speed of red.
Rule: the higher the index of refraction, the lower the speed.
Answer: red has the greater speed.
