The flow rate Q through a tube length L and radius r whose ends are kept at a pressure difference ∆ P is given by Q = c r 4 ∆ P L , where c is constant. The percentage uncertainty of which quantity has the largest effect on the percentage uncertainty in Q ?

r , L and ∆ P each give the same contribution

E M B I B E

Physics for the IB Diploma 6th Edition>Chapter 1 - Measurement and Uncertainties>Exam-style questions>Q 3

EASY

Diploma

IMPORTANT

Earn 100

The speed of sound is approximately $330 m s^{- 1}$ . A storm is $3 km$ away. Approximately how much later after seeing lightning will thunder be heard?

75% studentsanswered this correctly

Important Questions on Measurement and Uncertainties

EASY

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 1 - Measurement and Uncertainties>Exam-style questions>Q 4

In which of the following diagrams do the three forces add up to zero?

EASY

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 1 - Measurement and Uncertainties>Exam-style questions>Q 5

Three forces act on a body as shown.

Question Image

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Diploma

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Physics for the IB Diploma 6th Edition>Chapter 1 - Measurement and Uncertainties>Exam-style questions>Q 6

A force of

25 N

acts normally on a surface of area

5.0 {cm}^{2}

. What is the pressure on the surface in

N m^{- 2}

.

EASY

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 1 - Measurement and Uncertainties>Exam-style questions>Q 7

The side of a cube is measured with an uncertainty of

2 %

. What is the uncertainty in the volume of the cube?

EASY

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 1 - Measurement and Uncertainties>Exam-style questions>Q 8

The flow rate

Q

through a tube length

L

and radius

r

whose ends are kept at a pressure difference

∆ P

is given by

Q = \frac{c r^{4} ∆ P}{L}

, where

c

is constant. The percentage uncertainty of which quantity has the largest effect on the percentage uncertainty in

Q

?

EASY

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 1 - Measurement and Uncertainties>Exam-style questions>Q 9

The force of air resistance

F

on a car depends on speed

v

through the formula

F = a v^{2} + b v

, where

a

and

b

are constants. Which of the following graphs will result in a straight-line graph?

EASY

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 1 - Measurement and Uncertainties>Exam-style questions>Q 10

The diagram shows the temperature of a liquid before and after heating.

Question Image

Which is the best estimate for the temperature increase of the liquid?

EASY

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 1 - Measurement and Uncertainties>Exam-style questions>Q 11

A student wishes to measure the acceleration of free fall by letting a ping pong ball drop from one fixed height from the floor. He measures the height. Using a stopwatch, he measures the time for the ball to drop to the floor. He then uses the equation $h = \frac{1}{2} g t^{2}$ to calculate $g$ .

State and discuss three improvements to the student's lab experiment.