p01_013

Prévia do material em texto

13. None of the clocks advance by exactly 24 h in a 24-h period but this is not the most important criterion
for judging their quality for measuring time intervals. What is important is that the clock advance by
the same amount in each 24-h period. The clock reading can then easily be adjusted to give the correct
interval. If the clock reading jumps around from one 24-h period to another, it cannot be corrected since
it would impossible to tell what the correction should be. The following gives the corrections (in seconds)
that must be applied to the reading on each clock for each 24-h period. The entries were determined by
subtracting the clock reading at the end of the interval from the clock reading at the beginning.
CLOCK Sun. Mon. Tues. Wed. Thurs. Fri.
-Mon. -Tues. -Wed. -Thurs. -Fri. -Sat
A −16 −16 −15 −17 −15 −15
B −3 +5 −10 +5 +6 −7
C −58 −58 −58 −58 −58 −58
D +67 +67 +67 +67 +67 +67
E +70 +55 +2 +20 +10 +10
Clocks C and D are both good timekeepers in the sense that each is consistent in its daily drift (relative
to WWF time); thus, C and D are easily made “perfect” with simple and predictable corrections. The
correction for clock C is less than the correction for clock D, so we judge clock C to be the best and
clock D to be the next best. The correction that must be applied to clock A is in the range from 15 s
to 17s. For clock B it is the range from −5 s to +10 s, for clock E it is in the range from −70 s to −2 s.
After C and D, A has the smallest range of correction, B has the next smallest range, and E has the
greatest range. From best the worst, the ranking of the clocks is C, D, A, B, E.
	Main Menu
	Chapter 1 Measurement
	1.1 - 1.10
	1.1
	1.2
	1.3
	1.4
	1.5
	1.6
	1.7
	1.8
	1.9
	1.10
	1.11 - 1.20
	1.11
	1.12
	1.13
	1.14
	1.15
	1.16
	1.17
	1.18
	1.19
	1.20
	1.21 - 1.30
	1.21
	1.22
	1.23
	1.24
	1.25
	1.26
	1.27
	1.28
	1.29
	1.30
	1.31 - 1.40
	1.31
	1.32
	1.33
	1.34
	1.35
	1.36
	1.37
	1.38
	1.39
	1.40
	1.41 - 1.44
	1.41
	1.42
	1.43
	1.44
	Chapter 2 Motion Along a Straight Line
	Chapter 3 Vectors
	Chapter 4 Motion in Two and Three Dimensions
	Chapter 5 Force and Motion I
	Chapter 6 Force and Motion II
	Chapter 7 Kinetic Energy and Work
	Chapter 8 Potential Energy and Conservation of Energy
	Chapter 9 Systems of Particles
	Chapter 10 Collisions
	Chapter 11 Rotation
	Chapter 12 Rolling, Torque, and Angular Momentum
	Chapter 13 Equilibrium and Elasticity
	Chapter 14 Gravitation
	Chapter 15 Fluids
	Chapter 16 Oscillations
	Chapter 17 Waves—I
	Chapter 18 Waves—II
	Chapter 19 Temperature, Heat, and the First Law of Thermodynamics
	Chapter 20 The Kinetic Theory of Gases
	Chapter 21 Entropy and the Second Law of Thermodynamics
	Chapter 22 Electric Charge
	Chapter 23 Electric Fields
	Chapter 24 Gauss’ Law
	Chapter 25 Electric Potential
	Chapter 26 Capacitance
	Chapter 27 Current and Resistance
	Chapter 28 Circuits
	Chapter 29 Magnetic Fields
	Chapter 30 Magnetic Fields Due to Currents
	Chapter 31 Induction and Inductance
	Chapter 32 Magnetism of Matter: Maxwell’s Equation
	Chapter 33 Electromagnetic Oscillations and Alternating Current
	Chapter 34 Electromagnetic Waves
	Chapter 35 Images
	Chapter 36 Interference
	Chapter 37 Diffraction
	Chapter 38 Special Theory of Relativity
	Chapter 39 Photons and Matter Waves
	Chapter 40 More About Matter Waves
	Chapter 41 All About Atoms
	Chapter 42 Conduction of Electricity in Solids
	Chapter 43 Nuclear Physics
	Chapter 44 Energy from the Nucleus
	Chapter 45 Quarks, Leptons, and the Big Bang