C) 9.6 m/s F) 7.4 m/s 4) A car goes around a flat curve of radius 50 m at a spee

Question

C) 9.6 m/s F) 7.4 m/s 4) A car goes around a flat curve of radius 50 m at a speed of 14 m/s. What must be the minimum coefficient of friction between the tires and the road for the car to make the turn? A) 0.20 B) 0.40 C) 0.60 D) 0.80 E) 0.70 F) None of these 5) A mass of 50 kg is suspended from a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? The Modulus of Elasticity for steel is 20 x 10 N/m A) 1.5 cmm B) 2.5 cm C) 3.5 cm D) 4.5 cm E) 2.9 cm F) 3.9 cm G) None of These 6) A barometer is to be made using some alcohol p 850 kg/m3. How high will the column of alcohol be at atmospheric pressure? (Patm 1 .013 x 105 Pa) A) 12.2 m B) 3.13 m C) 13.1 m D) 10.3 m E) 31.3 m F) None of these 7) A carnival Rotor-ride has radius R - 5.0 m and a frequency of rotation f 0.50 rev/s. What is the minimum coefficient of static friction us, that will keep a person of mass m from sliding down when the bottom falls out? Let Ffr Force of friction

Explanation / Answer

4).

As we know

V^2= urg

14*14= 50*9.8 *u

u= 0.4

Option (b ) is correct.

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5).stretched length= (mg) L/(area* E)

Stretched length= (50*9.8)*11.2/(3.14/4* (10^-3)^2* 20*10^10)

= 3.5 cm

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Comment in case any doubt.. good luck

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