katlyn10289
21.09.2019 •
Physics
It has been said that in his youth george washington threw a silver dollar across a river. assuming that the wide, (a) what minimum initial speed river was 75 m was necessary to get the coin across the river and b) how long was the coin in flight?
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Ответ:
minimum initial speed was 27.11 m/s
coin in flight was 3.91 seconds
Explanation:
wide = 75 m
to find out
what was minimum initial speed and timer for coin in flight
solution
we know that speed will be minimum when angle is 45 degree so
we will use here equation of parabolic that is
so
distance = ...............1
here distance is 75 m and a is angle i.e 45 and g is 9.8 m/s² and v is speed
75 =
v = 27.11
minimum initial speed is 27.11 m/s
and
we know time for coin in flight formula is
time = ...............2
here v is speed and g is acceleration 9.8 and a is angle 45 degree
so
time =
time = 3.91
so coin in flight was 3.91 seconds
Ответ:
C
Explanation: