Answer:
If the speed of the merry-go-round doubles, the force you will need to exert to hang on is 400 N.
Explanation:
Given;
initial force exerted to hang on, F₁ = 100 N
The force exerted on the merry-go-round in order to hang on must be an inward force known as centripetal force.
Centripetal force is given by;
Therefore, If the speed of the merry-go-round doubles, the force you will need to exert to hang on is 400 N.
Answer: Not 100% sure but I believe the answer is B.
Hope this helps! ^^
Why space time curves in the presence of mass or energy?
Answer: A massive body such as the Earth causes gravity because matter is concentrated energy, hence E=mc². But note that a no mass photon also causes gravity, as done any kind of energy, not just mass-energy. Moreover the energy doesn't actually bend the surrounding space.
Hope this helped you!
V=f*wavelength
30m/s=f*(0.35m)
f=85.7 Hz