The cannon on a battleship can fire a shell a maximum distance of 38.0 km.
(a) Calculate the initial velocity of the shell.
? m/s
(b) What maximum height does it reach? (At its highest, the shell
is above a substantial part of the atmosphere--but air resistance
is not really negligible as assumed to make this problem
easier.)
? m
(c) The ocean is not flat, since the earth is curved. How many
meters lower will its surface be 38.0 km from the ship along a
horizontal line parallel to the surface at the ship?
? m
Does your answer imply that error introduced by the assumption of a flat earth in projectile motion is significant here? (Select all that apply.)
a. The error could be significant compared to the size of a target.
b. The error is insignificant compared to the distance of travel.
c. The error is insignificant compared to the size of a target.
d. The error is significant compared to the distance of travel.
(a) for maximum range , = 45
so
v2 = g * R
v = sqrt (gR)
v = sqrt (9.8 * 38000)
v = 610.24 m/s
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(b) Using kinematics in y-direction
at maximum height, velocity is zero
so,
h = v2 / 2g
h = (610.24 * sin 45)2 / 2 * 9.8
h = 9500 m
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(c) The radius of the earth is 6371 km
applying pythagoras, we have
h = sqrt ((d2 + r2 ) - r)
h = 6371.113 - 6371
h = 0.113325 Km
so,
h = 111.33 m
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