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PS113 Exam 2 Flashcards | StudBud
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PS113 Exam 2
PS113 Exam 2
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1
What is the power developed by the 40 N force at the end of the trip? m=20kg, v
f
=3.2 m/s
64 W
Power resides where people believes it resides. It is a trick, a shadow...
96 W
128 W
2
How much work is done on the block by the person? m=20kg, force is 40 N, d=5.0 m, μ
k
is 0.102._{ }
100 J
200 J
0 J
-200 J
3
What is the acceleration of the system below? (This problem takes place on Earth.)
5.2 m/s2
15 m/s2
10.4 m/s2
30 m/s2
4
What's the acceleration of this system?
(350sin35-250*9.8)/250 = 9 m/s2
(350cos35 - 125)/250 = 0.647 m/s2
(350sin35 - 250*9.8 - 125)/250 = 9.5 m/s2
350/250= 1.4 m/s2
5
g
venus
is 8.8 m/s
2
. An object with a mass of 53 kg on Earth has what mass on Venus?
53 kg
59 kg
can't say because the laws of physics are different on different planets
47.6 kg
6
g
venus
is 8.8 m/s
2
. An object with a weight of 200 N on Earth has what weight on Venus?
220 N
180 N
200 N
72 kg
7
For the mass system below: what is the force of tension on the rope between the two 5 kg masses?
200 N
300 N
75 N
225 N
8
What's the coefficient of kinetic friction?
125/250 = 0.5
125/(350cos35) = 0.44
125/(250*9.8-350sin35) = 0.056
125/(250*9.8) = 0.051
9
How much work is done on the block by gravity? m=20 kg force is 40 N. d=5.0 m. μ
k
is 0.102.
-200 J
-100 J
200 J
0 J
10
How much work is done on the block by friction? m=20 kg, d=5.0 m, μ
k
is 0.102._{ }
0 J
-100 J
-200 J
200 J
11
What is the final speed of the block assuming it starts from rest? m=20kg, W
p
= 200 J, W
f
= -100 J, W
g
= 0 J.
1.8 m/s
3.2 m/s
10 m/s
11.6 m/s
