Déjà Vu At 8:00 a.m. on Saturday, a nun begins running up the side of a mountain to his weekend campsite (see figure). On Sunday morning at 8:00 a.m., he runs back down the mountain. It takes him 20 minutes to run up but only10 minutes to run down. At some point on the way down, he realizes that he passed the same place at exactly the same time on Saturday. Prove that he is correct. [ Hint : Let s ( t ) and r ( t ) be the position functions for the runs up and down, and apply the Intermediate Value Theorem to the function f ( t ) = s ( t ) − r ( t ) .]
Déjà Vu At 8:00 a.m. on Saturday, a nun begins running up the side of a mountain to his weekend campsite (see figure). On Sunday morning at 8:00 a.m., he runs back down the mountain. It takes him 20 minutes to run up but only10 minutes to run down. At some point on the way down, he realizes that he passed the same place at exactly the same time on Saturday. Prove that he is correct. [ Hint : Let s ( t ) and r ( t ) be the position functions for the runs up and down, and apply the Intermediate Value Theorem to the function f ( t ) = s ( t ) − r ( t ) .]
Déjà Vu At 8:00
a.m.
on Saturday, a nun begins running up the side of a mountain to his weekend campsite (see figure). On Sunday morning at 8:00
a.m.,
he runs back down the mountain. It takes him 20 minutes to run up but only10 minutes to run down. At some point on the way down, he realizes that he passed the same place at exactly the same time on Saturday. Prove that he is correct. [Hint: Let s(t) and r(t) be the position functions for the runs up and down, and apply the Intermediate Value Theorem to the function
f
(
t
)
=
s
(
t
)
−
r
(
t
)
.]
Example 5: Two highway patrol cars are stationed 7 miles apart along a straight highway where
the speed limit is 65 mph. The first patrol car clocks a white Ram 1500 at 64 mph, and five
minute later, the second police car clocks it at 61.5 mph. Explain why the driver is pulled over
and issued a ticket.
You drive 6.0 km at 50 km/h and then another 6.0 km at 90 km/h. Your [Q2D]
:average speed over the 12 km drive will be
less than 70 km/h.
equal to 70 km/h.
greater than 70 km/h.
exactly 38 km/h.
It cannot be determined from the information given because we must also know
directions traveled.
The police discover a murder victim at 6:00a.m. The body temperature of the victim is measured then and found to be 25°C. A doctor arrives on the scene of the crime 40 minutes later and measures the body temperature again. It is found to be 22°C. The temperature of the room remains constant at 15°C. The doctor, knowing that normal body temperature is 37°C, estimate the time of death of the victim.
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