Physics (AS & A Level) · May / June 2020 · Paper 52 · Question 2
9702
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The question as text
A student investigates how the viscous force in a liquid varies with temperature. The student releases a ball from the surface of the liquid in a container. The ball falls as shown in Fig. 2.1. ball container liquid P Q Fig. 2.1 The student determines the speed of the ball between P and Q and measures the thermodynamic temperature T of the liquid. Viscosity is a term used to describe the viscous forces acting in a liquid. Viscosity has the unit pascal second (Pa s). The viscosity η of the liquid is calculated from the speed of the ball. The experiment is repeated for the same liquid at different temperatures. It is suggested that η and T are related by the equation η kT E He = c m where E and H are constants and k is the Boltzmann constant. 1
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2(a)[1]
2(b)[2]
2(c)(i)[2]
2(c)(ii)[2]
2(c)(iii)[2]
2(c)(iv)[1]
2(d)(i)[3]
2(d)(ii)[1]
2(e)[1]
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