Answer: It takes 12 N of force to pull the wagon.
Explanation:
Answer:
Option A
Explanation:
In this experiment, when balloon is rubbed on the chair electrons are transferred from the hair to the surface of the balloon thereby making balloon negatively charged and hair positively charged. When two negatively charged balloon are brought close to each other, they repel while when balloon is brought closer to the hair, they attract each other
Hence, option A is correct
Answer:
A digital signal picks up noise, but is still reliable.
Explanation:
c: a combination of longitudinal and transverse
Explanation:
Surface waves are a combination of longitudinal and transverse waves. These waves causes destruction after an earthquake on the ground surface.
- The surface waves are both rayleigh and love waves.
- Rayleigh waves and love waves are responsible for the destruction caused by an earthquake.
- They both have a unique characteristic of being propagated longitudinally and transversely away from their source.
- The spread compressional disturbance and undulating ones at the same time on the earth surface.
- These waves are seismic waves.
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Answer: the reaction force is large.
Explanation:
From Newton's third law, we know that for every action, there is equal and opposite reaction.
Since, a large amount of high speed of water is ejecting out from hose. The high momentum due to large speed in short duration of time would cause water to eject out with great force. The reaction force would act on the firefighter holding the hose. An equal amount of large force would act on him. Thus, it is difficult for a firefighter to hold a hose that ejects large amounts of high speed water.