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homework 06 – FONTENOT, BRIAN – Due: Feb 25 2008, 4:00 am
1
Question 1, chap 7, sect 1.
part 1 of 3
10 points
Assume you are on a planet similar to
Earth where the acceleration of gravity
g
≈
10 m
/
s
2
.
A plane 50 m in length is inclined at an
angle of 16
.
3
◦
as shown. A block of weight
500 N is placed at the top of the plane and
allowed to slide down.
500 N
μ
= 0
.
5
v
50 m
16
.
3
◦
48 m
14 m
The mass of the block is most nearly
1.
m
≈
25 kg
2.
m
≈
26 kg
3.
m
≈
39 kg
4.
m
≈
10 kg
5.
m
≈
52 kg
6.
m
≈
15 kg
7.
m
≈
20 kg
8.
m
≈
13 kg
9.
m
≈
50 kg
Question 2, chap 7, sect 1.
part 2 of 3
10 points
Calculate the magnitude of the normal
force exerted on the block by the plane.
1.
b
V
N
b ≈
240 N
2.
b
V
N
b ≈
160 N
3.
b
V
N
b ≈
360 N
4.
b
V
N
b ≈
480 N
5.
b
V
N
b ≈
200 N
6.
b
V
N
b ≈
400 N
7.
b
V
N
b ≈
120 N
8.
b
V
N
b ≈
80 N
Question 3, chap 7, sect 1.
part 3 of 3
10 points
Calculate the work done on the block by
the gravitational force during the 50 m slide
down the plane in J.
1.
W
≈
1750 J
2.
W
≈
3690 J
3.
W
≈
7000 J
4.
W
≈
10400 J
5.
W
≈
1350 J
6.
W
≈
650 J
7.
W
≈
3750 J
8.
W
≈
5850 J
9.
W
≈
2400 J
Question 4, chap 7, sect 1.
part 1 of 3
10 points
Sally applies a horizontal force of 706 N
with a rope to drag a wooden crate across a
±oor with a constant speed. The rope tied to
the crate is pulled at an angle of 42
◦
relative
to the ±oor.
The acceleration of gravity is 9
.
8 m
/
s
2
.
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View Full Documenthomework 06 – FONTENOT, BRIAN – Due: Feb 25 2008, 4:00 am
2
m
F
706 N
42
◦
How much force is exerted by the rope on
the crate?
Answer in units of N.
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 Spring '08
 Turner
 Physics, Acceleration, Gravity, Work

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