Thes are all correct :<span>2.Scientists observe natural events occurring around them. They question these observations and investigate them.
3.All scientists follow one scientific method of investigation
4.If a hypothesis is not verified by the results from the scientific method, scientists may either redo the process or create a new hypothesis.</span>
Answer: 7.5 rev/s
Explanation:
We are given the angular velocity
a helicopter's main rotor blades:
![\omega=450 rpm=450 \frac{rev}{min}](https://tex.z-dn.net/?f=%5Comega%3D450%20rpm%3D450%20%5Cfrac%7Brev%7D%7Bmin%7D)
However, we are asked to express this
in the International Systrm (SI) units. In this sense, the SI unit for time is second (
):
![\omega=450 \frac{rev}{min} \frac{1 min}{60 s}](https://tex.z-dn.net/?f=%5Comega%3D450%20%5Cfrac%7Brev%7D%7Bmin%7D%20%5Cfrac%7B1%20min%7D%7B60%20s%7D)
![\omega=7.5 \frac{rev}{s}](https://tex.z-dn.net/?f=%5Comega%3D7.5%20%5Cfrac%7Brev%7D%7Bs%7D)
Answer:
juz taking points nvm no sry for u cos u too wasted point
Answer:
65
Explanation:
The resonant frequencies for a fixed string is given by the formula nv/(2L).
Where n is the multiple
.
v is speed in m/s
.
The difference between any two resonant frequencies is given by v/(2L)= fn+1 – fn
fundamental frequency means n=1
i.e fn+1 – fn = 390 -325
= 65