Need help-
1.Eva is in a closed dark room. She uses her arm muscles to turn on a lamp. When she moves her hand closer to the lamp, the light heats her hand. The light bounces off the pages of a book and into her eyes. If this room is a closed system, what happens to the total amount of energy in the room?
A.It remains constant.
B.it increases
C.it decreases
D.it increases, then decreases
2.Chen connects several light bulbs in a series circuit. Electricity flows through the circuit, and all the light bulbs light up. What will happen if Chen removes one ligh bulb?
A.The circuit will be closed
B.the other bulbs will stay lit
C.the circuit will become a parallell circuit.
D.the other bulbs will turn off
D?
10.Carrie observes a blue object. Which color(s) of light does this object absorb?
A.blue
B.white
C.all colors except blue
D.all colors
C?
Thanks
-MC
right on the last two.
On the first one, I wonder if the author knows physics. How can the room be a closed system if electrical energy is entering? Duh, and double duh.
Ignoring that mental flaw, if electricity is entering the room, the total energy in the room is increasing. I suspect your "teacher" had some unknown purpose for this question.
Hmmm, I wonder. Well thanks :D
-MC
1: the answer is a. It remains constant.
The other two are right.
NUMBA 1 IS B
NUMBA 2 IS D
NUMBA 10 IS C
GOOOOOOTTTTTT ITTTTTTT???????????!!!!
NOW EXCUUUSE ME I HAS TO GOOOOOOOO POOP
1. To determine what happens to the total amount of energy in the room, we need to understand the concept of energy conservation within a closed system. In a closed system, energy cannot enter or leave, so the total amount of energy remains constant.
In this scenario, when Eva turns on the lamp, electrical energy is converted to light energy. When the light heats her hand, some of the light energy is converted to thermal energy. When the light bounces off the pages of the book and into her eyes, some of the light energy is converted to visual energy.
However, despite these energy conversions, the total amount of energy in the room remains constant because the room is a closed system. Therefore, the correct answer is A. It remains constant.
2. In a series circuit, the current flows through all the components (light bulbs) in a single path. If one light bulb is removed, the circuit is interrupted, and the flow of electricity is interrupted as well. This means that the other bulbs will turn off.
So, the correct answer is D. the other bulbs will turn off.
10. When Carrie observes a blue object, it means that the object appears blue to her eyes. The color of an object depends on the wavelengths of light that it reflects or absorbs. Objects appear to have the color of the light they reflect and do not absorb.
Since a blue object appears blue, it means that it reflects blue light while absorbing other colors. So, the correct answer is C. It absorbs all colors except blue.
Based on the given information, the correct answers are A, D, and C for questions 1, 2, and 10, respectively.