Hello!
Work is equal to negative change in PE and PE=mgh and Power is change in work/change in time
So we have
56.1kg * 9.80m/s^2 * 16m = 8796.5 J of PE at top of run and -8796.5J of work done also
if it takes him 12s then we need to find the time gravity alone would bring him to the bottom. we get
16m=1/2at^2 and solving for t we get
t=sqrt(32/9.80m/s^2)=1.81s
so the difference in time is 12-1.8=11.2s
now we can find avg power=work/time = 8796.5J/11.2s = 785W or 785J/s
Hope this helps! Any questions please ask! Thank you!
The positively charged atmosphere attracts negatively charged spider silk, might electrostatic force play in spider dispersal, according to a recent study.
Answer: Option C
<u>Explanation:</u>
The positive charge present in upper of the atmosphere and the negative charge on planet’s surface. During cloudless skies days, the air possesses a voltage of nearly around 100 volts for each and every meter from above the ground.
Ballooning spiders process within this planetary electric field. When their silk relieve their bodies then it picks up a negative charge. This oppose the similar negative charges on the surfaces on which the spiders settles and create sufficient force to lift them into the air. And spiders can hike those forces by climbing onto blades of grass,twigs, or leaves.
Answer:
utrasonic
Explanation:
these are sounds beyond our hearing capacity range of 20-20kHz
Answer:
They are conductors/conductive. Materials that can transfer thermal energy well are conductive.
Explanation:
