In 1834, Johann Scheibler (1777–1837) invented a musical instrument made of 54 tuning forks that vibrated between 220 cycles per second and 440 cycles per second. He made it

so that successive tuning forks had equal increases in cycles per second.

a What was the size of the increase between two successive tuning forks?

b Write down the cycles per second of the fi rst four notes of Scheibler’s instrument.

c What is the difference between Scheibler’s scale and a modern one?

be subject to a force andchange its motion

see earlier

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)