# Phy 101 2nd Assignment Solution Fall 2012

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Assignment No.2                            Total Marks: 20
Semester: FALL 2012                          Due Date: 3, 5
2012
BC100401133
Physics 101

Question # 1
What is the value of arc length in the shown figure below?

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Solution:
Institute
Formula:
And
60
S=r∅                  r= 0.35m and ∅= 60 =       1.04 radian
57.3                                                 Management
Put all value
Studies
S = (0.35) (1.04)
PSDR02
S =0.36 m

Question # 2
In the fig shown below, at 12:10, the initial angular position of the minute hand is 60˚.

After 15 minutes have passed, what is the minute hand’s angular displacement?

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Institute
Solution:
And

Management
Circle = 360

In above figure 12:10 min has 60
Studies

We know that 60 minutes = 360o                   For urgent help call

For 10 min = 60                                      0331-4177396

For 5 min = 30

Similarly for 15 min = 90

Question # 3
Give your opinion on the following statement,                                                   Shine

“Wave speed in a string is a function of frequency, so if anyone increases the wave             Institute
Frequency, the wave speed will increase, too.” If yes give an example, if no explain it.
And
Solution:
Management
Yes!
Studies
Frequency (f) is directly proportional to the speed (v) at constant ⋋.

Example:                                                                                        PSDR02
If ⋋=3m

f=2s-1

v=f.⋋     , v=2×3

v=6 m/s

And f=3s-1

v=3×3

v=9 m/s            For urgent help call

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Question # 4                                                               Institute

Suppose that a rocket provides 58 Nm of torque for 3.0 s.                  And
What is the amount of change in the Satellite’s angular momentum?
Management
Solution:
Studies
We have
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Torque    58Nm
Time = t  3s                                  0331-4177396
Formula :
dt    dt
putting values
dt  58  3
dt  174 kgm 2 / s

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