CROSS
RIVER UNIVERSITY OF TECHNOLOGY
DEPARTMENT OF
PHYSICS
FIRST SEMESTER
EXAMINATION 2015/2016
PHY1104: Laboratory
Physics I Time 212 Hours
Attempt
all questions in section A and B
Section A
1. The
equation of a straight line is given by
P = ax + k. what do a and k represent
2. Draw
a graph of the equation in question 1. In which k = 0
3. In
the equation governing the motion of a simple pendulum T = 2π
transform the equation making g the subject of
the equation.
transform the equation making g the subject of
the equation.
4. In
question 3 if you were to plot a graph of T2 against I. write down the part of the
transform equation that represents the slope.
5. What
do you understand by standard error for value.
6. Suppose
T1 = 94.0 ± 0.5; T2 = 85.5 ± 0.50C and T = T1
- T2
If the errors quoted are standard
errors. Write down the value of T and the standard error.
7. If
V = πd2 ¼ where I = 89 +
0.1cm (limit m.e.) and D = 2.1 + 0.1cm (limit m.e)
Obtain the maximum error in V.
Section
B
In an experiment to
determine the radius of gyration of a bar pendulum an the acceleration due to
gravity, a student displaced the bar slightly to note the time for 10
oscillations. The bar was suspended from the 5cm mark Sp. The entire experiment
was then repeated for equal interval of 5cm and the following observation was
made. The bar or meter rule was balanced at Sg = 50.2
Sp
|
5,
|
10,
|
15,
|
20,
|
25,
|
30,
|
35,
|
40
|
T1
|
32.2
|
31.8
|
31.0
|
30.6
|
30.8
|
31.8
|
34.0
|
38.2
|
T2
|
32.2
|
31.8
|
31.0
|
30.7
|
30.8
|
31.8
|
34.0
|
38.4
|
Questions
1. Construct
a composite table for the results
2. Determine
h = Sg – Sp (cm)
3. Determine
the period for each position
4. Plot
a graph of hT2 against h2
5. Determine
the slope of your graph
6. Read
out the intercept on the h2 axis
7. From
the equation T = 2π
{( h2 + k2)/gh}
{( h2 + k2)/gh}
8. Deduce
the values of g, and k from your graph.
9. What
does k represent?
10.
Plot another graph of T against h using
a suitable scale and a different graph page. Is your graph a straight line or a
curve?
11.
If it is a straight line what does the
shape represent and if it is a curve what does the minimum point represent.
12.
State two sources of error in this
experiment.
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