Physics Laboratory Experiments
8th Edition
ISBN: 9781285738567
Author: Jerry D. Wilson, Cecilia A. Hernández-Hall
Publisher: Cengage Learning
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Chapter 3, Problem 8ASA
To determine
The method by which the volume of a heavy irregular shaped object can be determined.
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Although aluminum foil is very thin, it does have some thickness. We cannot typically “measure” the thickness ofsuch a thin object directly, but the thickness can be determined “indirectly”. Assume that the density of aluminum is2.70 g/cm3 and that the shape of the square aluminum foil is a rectangular cuboid. Then by using the experimental data of the length of the aluminum square 5.10cm, Width is 5.00cm and the mass of aluminum is 0.11g. Determine the thickness of aluminum foil in micrometers. Show your work.
The volume of liquid flowing per second is called the volume
flow rate Q and has the dimensions of [L][T]. The flow rate of a
liquid through a hypodermic needle during an injection can be estimated
60.
with the following equation:
TR"(P2 – P,)
8nL
The length and radius of the needle are L and R, respectively, both of
which have the dimension [L]. The pressures at opposite ends of the nee-
dle are P, and P,, both of which have the dimensions of [M]/{[L][T]*}.
The symbol 7 represents the viscosity of the liquid and has the dimen-
sions of [M]/{[L][T]}. The symbol 7 stands for pi and, like the number 8
and the exponent n, has no dimensions. Using dimensional analysis, de-
lermine the value of n in the expression for Q.
Objectives:
1. Analyze sets of data and decide whether the measurements are precise
and/or accurate.
2. Calculate percent error.
The following sets of measurement for the density of a small cylinder of
aluminum were given. The "accepted' density of aluminium is 2.702 g/cm3.
SET A
SET B
2. 240 g/cm
2.700 g/cm3
2.690 g/cm3
2.705 g/cm3
2.450 g/cm3
2.703 g/cm³
2. 150 g/cm
2.701 g/cm³
1. Calculate the average value for each set of density.
2. Calculate the % error for each set of values.
3. Compare the average value for each set with the accepted value:
Which student's data is more accurate?
Which student's data is more precise?
4. Compare the percentage error for each set:
Which student's data is more accurate?
Which student's data is more precise?
Chapter 3 Solutions
Physics Laboratory Experiments
Ch. 3 - Prob. 1ASACh. 3 - Does a laboratory balance measure weight or mass?...Ch. 3 - What is the function of the vernier scale on the...Ch. 3 - Distinguish between positive and negative zero...Ch. 3 - What is the purpose of the ratchet mechanism on a...Ch. 3 - Explain how readings from 0.00 through 1.00 mm are...Ch. 3 - Prob. 7ASACh. 3 - Prob. 8ASACh. 3 - Explain the probable source of error(s) in the...Ch. 3 - Prob. 2Q
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