The variable you can change in an experiment is ( B ) A dependent variable
True because a nuclear power produces tons of high level radioactive waste that has to be disposed of carefully
Answer:
a)
, b)
, c)
,
, d) 
Explanation:
a) The gravitational force exerted by the Earth on the satellite is:



b) The centripetal acceleration of the satellite is:


c) The speed of the satellite is:



Likewise, the angular speed is:


d) The period of the satellite's rotation around the Earth is:


Answer:
198.2m/s
Explanation:
Speed of a wave(v) is the product of the frequency of the wave (f) and its wavelength(¶).
Mathematically, v = f/¶
Given frequency of the middle C = 261.63Hz
Wavelength = 131.87cm
Converting this to meters we have;
131.87/100 = 1.32m
Speed of the sound = 261.63/1.32
Speed of the sound = 198.20m/s
Therefore the speed of sound for middle C is 198.2m/s