PHYS 261 Cumulative Lab exam
questions with correct answers
$A$5 means? - CORRECT ANSWER-✔✔✅Fixed cell
How to plot cartesian coordinates - CORRECT ANSWER-✔✔✅Scatter chart
Solver - CORRECT ANSWER-✔✔✅Minimizes or maximizes a cell by varying other cells
To use a macro, you may have to first: - CORRECT ANSWER-✔✔✅Go to view tab and click on the macro
button
To exit a lab template: - CORRECT ANSWER-✔✔✅Enter name and section number and save file using
macro
You measure the length of the same side of a block five times and find: b=11.0, 11.1, 11.2, 11.2, and 11.3
mm. What is the best estimate for b? - CORRECT ANSWER-✔✔✅11.16 mm
Take the average
You measure the length of the same side of a block five times and each measurement has an uncertainty
of 0.10 mm. What is the uncertainty in the best estimate for b? - CORRECT ANSWER-✔✔✅0.0447
=0.10/sqrt(5)
Yoy measure the lengths of three sides of a block and find a=12.23 mm, b=14.51 mm, c=7.45 mm with
an error of +-0.030 mm in each measurement. What is the uncertainty in the volume of the block? -
CORRECT ANSWER-✔✔✅6.8 mm^3
(DeltaV/V)^2=(deltaa/a)^2+(deltab/b)^2+(deltac/c)^2
A block is measured to have mass M=25.3 g and volume V=9.16 cm3 with an uncertainty of
deltaM=0.050 g in the mass and deltaV=0.050 cm3 in the volume. What is the uncertainty in the
density? - CORRECT ANSWER-✔✔✅0.016 g/cm3
, (Deltap/p)^2=(deltaM/M)^2+(deltaV/V)^2
A block is measured to have a density p=2.76 g/cm3 with an uncertainty of deltap=0.030 g/cm3. Find
chi-squared when the measured density is compared to the accepted density p=2.70 g/cm3. - CORRECT
ANSWER-✔✔✅Chi-squared=4
Chi-squared=sum((xi-xtheory)/deltaxi)^2
In this lab, the position of a cart will be measured using a sonic ranger. This measures the position by: -
CORRECT ANSWER-✔✔✅Emitting an ultrasonic pulse
A cart of mass m=0.20 kg rides on an air track that is tilted at an angle 2 degrees from the horizontal.
What is the magnitude of the total force on the cart? - CORRECT ANSWER-✔✔✅0.068 N
Mass*9.8*sin(theta)
A cart of mass m=0.25 kg rides on an air track that is tilted 3 degrees from the horizontal. What is the
magnitude of the cart's acceleration? - CORRECT ANSWER-✔✔✅0.51 m/s^2
9.8*sin(theta)
A sonic ranger measures positions X=0.10 m, 0.15 m, 0.22 m, 0.28 m at times t=0 s, 0.10 s, 0.20 s, and
0.30 s. Find the magnitude of the average velocity between t=0.10 s and 0.20 s. - CORRECT ANSWER-
✔✔✅0.7 m/s
Deltax/deltat
Suppose you measure g=9.7 m/s^2 with an uncertainty of deltag=0.060 m/s^2. Is this consistent with
the accepted value g=9.801 m/s^2? - CORRECT ANSWER-✔✔✅Yes
Chi-squared=sum((xi-xtheory)/deltax)^2
Chidist(2.83,1)=0.09
USE EXCEL FOR CHIDIST
Two carts approach each other, collide, and stick together after the collision. This is an example of what
type of collision: - CORRECT ANSWER-✔✔✅Perfectly inelastic collision
questions with correct answers
$A$5 means? - CORRECT ANSWER-✔✔✅Fixed cell
How to plot cartesian coordinates - CORRECT ANSWER-✔✔✅Scatter chart
Solver - CORRECT ANSWER-✔✔✅Minimizes or maximizes a cell by varying other cells
To use a macro, you may have to first: - CORRECT ANSWER-✔✔✅Go to view tab and click on the macro
button
To exit a lab template: - CORRECT ANSWER-✔✔✅Enter name and section number and save file using
macro
You measure the length of the same side of a block five times and find: b=11.0, 11.1, 11.2, 11.2, and 11.3
mm. What is the best estimate for b? - CORRECT ANSWER-✔✔✅11.16 mm
Take the average
You measure the length of the same side of a block five times and each measurement has an uncertainty
of 0.10 mm. What is the uncertainty in the best estimate for b? - CORRECT ANSWER-✔✔✅0.0447
=0.10/sqrt(5)
Yoy measure the lengths of three sides of a block and find a=12.23 mm, b=14.51 mm, c=7.45 mm with
an error of +-0.030 mm in each measurement. What is the uncertainty in the volume of the block? -
CORRECT ANSWER-✔✔✅6.8 mm^3
(DeltaV/V)^2=(deltaa/a)^2+(deltab/b)^2+(deltac/c)^2
A block is measured to have mass M=25.3 g and volume V=9.16 cm3 with an uncertainty of
deltaM=0.050 g in the mass and deltaV=0.050 cm3 in the volume. What is the uncertainty in the
density? - CORRECT ANSWER-✔✔✅0.016 g/cm3
, (Deltap/p)^2=(deltaM/M)^2+(deltaV/V)^2
A block is measured to have a density p=2.76 g/cm3 with an uncertainty of deltap=0.030 g/cm3. Find
chi-squared when the measured density is compared to the accepted density p=2.70 g/cm3. - CORRECT
ANSWER-✔✔✅Chi-squared=4
Chi-squared=sum((xi-xtheory)/deltaxi)^2
In this lab, the position of a cart will be measured using a sonic ranger. This measures the position by: -
CORRECT ANSWER-✔✔✅Emitting an ultrasonic pulse
A cart of mass m=0.20 kg rides on an air track that is tilted at an angle 2 degrees from the horizontal.
What is the magnitude of the total force on the cart? - CORRECT ANSWER-✔✔✅0.068 N
Mass*9.8*sin(theta)
A cart of mass m=0.25 kg rides on an air track that is tilted 3 degrees from the horizontal. What is the
magnitude of the cart's acceleration? - CORRECT ANSWER-✔✔✅0.51 m/s^2
9.8*sin(theta)
A sonic ranger measures positions X=0.10 m, 0.15 m, 0.22 m, 0.28 m at times t=0 s, 0.10 s, 0.20 s, and
0.30 s. Find the magnitude of the average velocity between t=0.10 s and 0.20 s. - CORRECT ANSWER-
✔✔✅0.7 m/s
Deltax/deltat
Suppose you measure g=9.7 m/s^2 with an uncertainty of deltag=0.060 m/s^2. Is this consistent with
the accepted value g=9.801 m/s^2? - CORRECT ANSWER-✔✔✅Yes
Chi-squared=sum((xi-xtheory)/deltax)^2
Chidist(2.83,1)=0.09
USE EXCEL FOR CHIDIST
Two carts approach each other, collide, and stick together after the collision. This is an example of what
type of collision: - CORRECT ANSWER-✔✔✅Perfectly inelastic collision
