Answer:
C. Adding some of the unknown liquid to red litmus paper.
Explanation:
Since the student doesn't know what the liquid is, it is not safe to experiment with it by boiling, cooling, or adding water to it. The safest option would be to add a small bit of the liquid to the litmus paper, which will identify the liquid as neutral, basic, or acidic.
Unit for x - the change in the spring length:
x = [ m ]
PE s = 1/2 k x²
[ kg m² / s² ] = 1/2 k * [ m² ] /: m²
k = [ kg / s² ]
Answer: The unit for spring constant k is kg/ s²
Answer:
Gate control theory of pain
Explanation:
The gate control theory of pain sates that non-painful input closes the nerve gates to painful input, which prevents pain sensation from traveling to the central nervous system (brain).
Therefore, the idea that large fibers in the sensory nerves can prevent impulses from reaching the brain and thus prevent the sensation of pain is part of the gate control theory of pain.
Answer:
1. A
2. C
3. A
4. B
Explanation:
A conductor allows electric current to pass through it. Hence, when conductors are connected in a closed circuit, current flows.
All the resistors in Q2 are connected in series. In a series connection, the current across all the resistors is the same.
In a battery, chemical energy is converted to electrical energy by chemical reactions.
When a new resistor is connected in parallel to a circuit the current increases accordingly.
Answer:
He could have many different hypothesis, but here is one.
Explanation:
If rubber bands are wider, then the rubber bands will stretch further, because the wider a rubber band is the stronger it is.
