1.2. SI units
A subsection of Physics, 9702, through 1. Physical quantities and units
Listing 10 of 82 questions
State two SI base units other than the kilogram, metre and second. 1. 2. A metal wire has original length l0. It is then suspended and hangs vertically as shown in . wire The weight of the wire causes it to stretch. The elastic potential energy stored in the wire is E. Show that the SI base units of E are kg m2 s–2. The elastic potential energy E is given by E = Cρ 2g 2Al0 where ρ is the density of the metal, g is the acceleration of free fall, A is the cross-sectional area of the wire and C is a constant. Determine the SI base units of C. SI base units of C
9702_w13_qp_21
THEORY
2013
Paper 2, Variant 1
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State two SI base units other than the kilogram, metre and second. 1. 2. A metal wire has original length l0. It is then suspended and hangs vertically as shown in . wire The weight of the wire causes it to stretch. The elastic potential energy stored in the wire is E. Show that the SI base units of E are kg m2 s–2. The elastic potential energy E is given by E = Cρ 2g 2Al0 where ρ is the density of the metal, g is the acceleration of free fall, A is the cross-sectional area of the wire and C is a constant. Determine the SI base units of C. SI base units of C
9702_w13_qp_22
THEORY
2013
Paper 2, Variant 2
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The time T for a satellite to orbit the Earth is given by T M KR3 = c m where R is the distance of the satellite from the centre of the Earth, M is the mass of the Earth, and K is a constant. Determine the SI base units of K. SI base units of K Data for a particular satellite are given in . quantity measurement uncertainty T 8.64 × 104 s ± 0.5% R 4.23 × 107 m ± 1% M 6.0 × 1024 kg ± 2% Calculate K and its actual uncertainty in SI units. K = ± SI units
9702_w13_qp_23
THEORY
2013
Paper 2, Variant 3
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Questions Discovered
82