- Q4 A block whose mass m is 680 g is fastened to a spring whose spring constant k is 65N/m The block is pulled a distance x(=11cm) from its equilibrium position and released from rest. (a) What force does the spring exert on the block just before it is released? (3 marks) (b)What are the angular frequency , the frequency, and the period of oscillation? (6 Marks) (c) What is the amplitude of the oscillation? (2 Marks) (d) What is the maximum speed of the oscillating block?(3 marks) (e) What is the magnitude of the maximum acceleration of the block? (3 marks) (3 marks) (f) What is the phase constant of the motion?
- (g) (i) Define work done by a constant force. (1 mark) (ii) Find the work done on a particle that undergoes a displacement given by Delta overrightarrow (r)=2hat (i)+3hat (j) m due to a constant force overrightarrow (F)=5hat (i)+2hat (j)N (3 marks)
- (f) (i) What is meant by Stokes law? (1 mark) (ii) An iron sphere of radius 0.3 cm drops in oil at 0.5cm/s . If the densities of oil and iron are 0.94g/cm^3 and 7.8g/cm^3 respectively , find the viscosity of the oil. (3 marks)
- (4) Read the sentence pairs . Choose which word best fits each blank. 1 mega/giga A A prefix that increases a unit by 1 ,000,000 is called __ B A prefix that increases a unit by 1 ,000,000,000 is called __ 2 nano/pico A A prefix that decreases a unit by 1,000,000,000,000 is called __ B A prefix that decreases a unit by 1,000,000,000 is called __ kilo / milli A A prefix that decreases a unit by 1 ,000 is called __ B A prefix that increases a unit by 1 ,000 is called __
- 3. Paccuurarb HOrpelllHOCTb l_(mp) no coopMyJIe (Delta _(mp))/(l_(mp))=2(Delta T)/(T)+(Delta g)/(g)+tgalpha cdot Delta alpha +2(Delta pi )/(pi )
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