harvey (jnh849) – HW 5 – riley – (999942)
1
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18
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001
10.0 points
A car is going up a hill when the driver hits
the brakes.
car
v
As the car slows to a stop, which vector di
agram below shows the the correct directions
of all of the forces acting on the car?
1.
2.
3.
4.
5.
None of these graphs are correct.
6.
7.
002
(part 1 of 2) 10.0 points
A light, inextensible cord passes over a light,
frictionless pulley with a radius of 12 cm. It
has a(n) 13 kg mass on the left and a(n)
2
.
3 kg mass on the right, both hanging freely.
Initially their center of masses are a vertical
distance 3
.
1 m apart.
The acceleration of gravity is 9
.
8 m
/
s
2
.
3
.
1 m
12 cm
ω
13 kg
2
.
3 kg
At what rate are the two masses accelerat
ing when they pass each other?
Answer in units of m
/
s
2
.
003
(part 2 of 2) 10.0 points
What is the tension in the cord when they
pass each other?
Answer in units of N.
004
(part 1 of 2) 10.0 points
A 30900 kg sailboat experiences an eastward
force 25700 N due to the tide pushing its hull
while the wind pushes the sails with a force of
74200 N directed toward the northwest (45
◦
westward of North or 45
◦
northward of West).
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 Winter '08
 CARROLL
 Physics, Force, Friction, Mass, kg, Harvey

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