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(b)
gives
(c)
gives
gives
Reflect:
The SRBs have greater speed when they return to the ground than they had when released. After release
they continue to travel upward. When they return to an altitude of 45 km on their way back down their speed is
but they gain additional speed as they continue to fall to earth.
2.78. Set Up:
Take
to be the direction the car moves when speeding up. Use the acceleration and stopping data
to find
a
in each case.
Design the onramp for the less powerful car and the offramp for the
car with bald tires.
Solve:
onramp
(speeding up):
and
gives
Then
and
in
gives
This is the required length of the onramp.
offramp
(slowing down):
and
gives
Then
and
in
gives
This is the required length of the offramp.
2.79. Set Up:
The time interval of 35 years is
Solve:
The minus sign means that
is directed opposite to
the speed of growth is decreasing in time.
2.80. Set Up:
Let
be to the right.
(a)
is constant so
is constant and positive.
(b)
increases so
is
positive and increasing.
(c)
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This note was uploaded on 03/06/2009 for the course PHYS 114 taught by Professor Shoberg during the Spring '07 term at Pittsburg State Uiversity.
 Spring '07
 Shoberg

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