Answer:
Explanation:
speed of longitudinal wave in a rod =
Where Y is young's modulus of elasticity and D is density .
Putting given data
5068 =
D = 199 x 10⁹ / .2568 x 10⁸
= 7749 kg / m³
b )
Rod's ends are not to vibrate as they are clamped . So node is produced there .
c )
Frequency = 440 Hz
Note = fundamental
l = λ / 2 , l is length of rod and λ is wavelength
wavelength of 440 Hz note
= velocity of sound / frequency
= 5068 / 440
= 11.518 m
l = 11.518 / 2
= 5.76 m .
Length of rod = 5.76 m
d )
l = .095 m
velocity = 5149 m /s
wavelength = 2l
= 2 x .095 m
= .19 m
frequency = velocity / wavelength
= 5149 / .19
= 27100 Hz .
Contact- Frictional force (Needs to be rubbing against the toy for it to happen)
Non Contact- Probably…? Gravitational force (Doesn’t need to be touching for it to happen)
Answer:
I'm over halfway through it so don't have a complete answer but i think you just need to keep ontop of everything and write down all the key equations on flashcards or something and aim to learn them at the beginning of each topic. i found the longer questions hard so recommend practising those
Explanation:
I’m pretty sure b isn’t right because it’s counting towards multiple strands of DNA.