Answer:
i hope the answear is D becuase went over this long time ago when i was like you
Explanation:
To solve this problem it is necessary to apply the related concepts to string vibration. This concept shows the fundamental frequency of a string due to speed and length, that is,

Where
v = Velocity
L = Length
Directly if the speed is maintained the frequency is inversely proportional to the Length:

Therefore the relationship between two frequencies can be described as


Our values are given as,

Therefore the second frequency is

The frequency allocation of 329Hz is note E.
I think it is B the rise of the land
We have that the block is moving horizontally. Hence, its potential energy due to gravity stays the same. The only change in its mechanical energy is the one due to the change of speed. This reduction of its kinetic energy, due to the conservation of energy, is equal to the work that friction does. We have that at A the kinetic energy is : K=1/2*m*u^2=10*10*10/2=500J. At B, we have that K=1/2*10*16=80J. Sine we have that the initial value is 500, the work from the friction force (opposite to the movement of the object) is 80-500=420J.
Answer:
a magnifying glass cause a Virtual image
Explanation:
:)