2015 VCAA Physics Exam Solutions.pdf

speed of block B after collision is 5.0 ms-1.
Q1b: kinetic energy is not conserved, collision is inelastic.
Q1c: impulse on block A is 40 Ns to the left.
Q2a: acceleration of two masses together is 0.2 ms-2.
Q2b: tension in string is 0.8 N.
Q3b: force on object is 38 N.
Q4b: angle of bank of track is approximately 17°.
Q5a: height of projectile is 20 m.
Q5b: distance traveled is 8.24 m.
Q6a: decrease in potential energy is 16 J.
Q6b: spring potential energy is 16 J.
Q6c: speed at midpoint is 0.2 ms-1.
Q6d: graph C represents the motion.
Q7a: period is 36900 s.
Q7b: radius of orbit is approximately 8.1 x 10^9 m.
Q7c: astronaut feels weightless.
Q8b: voltage drop is not given.
Q9a: LED changes electrical signal to light signal.
Q9b: photodiode changes light signal to electrical signal.
Q10a: voltage is 15 kV.
Q10b: resistance is 75 kΩ.
Q11a: voltage gain is 50.
Q11b: amplifier has an output range of ±0.8 V.
Q12a: force on wire is 0.2 N.
Q12b: voltage is not given.
Q12c: average induced emf is 26.0 mV.
Q12d: replace split-ring commutator with slip-rings.
Q13a: magnetic flux is not given.
Q13b: emf is not given.
Q13c: induced current flows anticlockwise.
Q14a: frequency is 25 Hz.
Q14b: input RMS voltage is approximately 5.9 x 10^2 V.
Q16a: power is 0.2 W.
Q16b: voltage output is 10.8 V.
Q16c: power loss is 0.16 W.
Q16d: current in transmission lines is 20.0 A.
Q16e: power loss is 16.0 W.
Q16f: transmission of electric power uses step-up and step-down transformers.
Q17a: point is a bright band.
Q17b: answer is C.
Q18a: frequency is 5 x 10^14 Hz.
Q18b: Planck's constant is approximately 6.63 x 10^-34 Js.
Q18c: not given.
Q18d: not given.
Q19a: energy levels are approximately 9.91 eV and 109 eV.
Q19b: photon energy is approximately 0.30 eV.
Q20a: photoelectric effect explains dependence on frequency and type of metal.
Q20b: experiment by Davisson and Germer demonstrated electron diffraction.