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1.2. SI units
A subsection of Physics, 9702, through 1. Physical quantities and units
Listing 10 of 82 questions
State two SΙ base quantities other than mass, length and time. 1. 2. A beam is clamped at one end and an object X is attached to the other end of the beam, as shown in . l clamp beam object X oscillation of X The object X is made to oscillate vertically. The time period T of the oscillations is given by T = K Ml 3 E where M is the mass of X, l is the length between the clamp and X, E is the Young modulus of the material of the beam and K is a constant. 1. Show that the SΙ base units of the Young modulus are kg m–1 s–2. 2. Determine the SΙ base units of K. SΙ base units of K Data in SΙ units for the oscillations of X are shown in . quantity value uncertainty T 0.45 ± 2.0% l 0.892 ± 0.2% M 0.2068 ± 0.1% K 1.48 × 105 ± 1.5% Calculate E and its actual uncertainty. E = ± kg m–1 s–2
9702_w15_qp_21
THEORY
2015
Paper 2, Variant 1
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The kilogram, metre and second are all SI base units. State two other SI base units. 1. 2. A uniform beam AB of length 6.0 m is placed on a horizontal surface and then tilted at an angle of 31° to the horizontal, as shown in . A B 31° 6.0 m 90 N W X Y (not to scale) The beam is held in equilibrium by four forces that all act in the same plane. A force of 90 N acts perpendicular to the beam at end A. The weight W of the beam acts at its centre of gravity. A vertical force Y and a horizontal force X both act at end B of the beam. State the name of force X. By taking moments about end B, calculate the weight W of the beam. W = N Determine the magnitude of force X. magnitude of force X = N
9702_w18_qp_22
THEORY
2018
Paper 2, Variant 2
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Questions Discovered
82