PHY-1321-Final-Exam-2015.pdf - Andrzej Czajkowski...

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Andrzej Czajkowski Czajkowski PHY1321/1331 exam Page 2 out of 10 1 Two friends pull on the rope from opposite sides. If they are not moving with respect to each other, and one of them pulls with the force of 400N, the tension in the rope is___ a) 400N b) 200N c)100N d) it is impossible to answer without extra information e) none of the above 2 2kg mass hangs an the string. String makes angle π /4 with the ceiling. The tension in the string is: A 3N B 14.5N C 29.4N D 19.6N E none of the above 3 The position of a particle of mass 2kg is given by r = 3 ti t 2 j + 2 k (t is in seconds and r in meters). The magnitude of the instantaneous velocity at t = 2s is: A 8m/s B 5m/s C 3 i 4 j D -8 m/s E none of the above 4 A particle of mass M, is at the origin while the particle of the mass 4M is at x=1m. The centre of mass of this system is at: A x=0.1m B x=0.2m C x=0.4 m Dx= 0.8 m E none of the above. 5. The 6 kg grenade explodes inside the horizontal narrow pipe. After the explosion the 2 kg piece is observed to leave from the left side of the pipe with the speed of 50m/s. The second (3kg) piece leaves from the right side of the pipe with speed of 20m/s. What is the speed of the third (last) piece of the grenade, and from which side of the pipe will it emerge? a) 20m/s, right b) 20m/s, right c) 40m/s, left d) 40m/s , right e) none of the above 6. The molar specific heat at constant pressure Cp at -200°C of an ideal diatomic gas is a. R 2 1 . b. R . c. R 2 3 . d.2 R . e. R 2 5 . 7. A constant force of 12 N in the positive x direction acts on a 4.0-kg object as it moves from the origin to the point (3 i – 4 j ) m. How much work is done by the given force during this displacement? A) +60 J B) +84 J C) -48 J D) +36 J E) +none of the above 8. The only force acting on a 2.0 kg object moving along the x axis is shown. If the velocity v x is 2 0 . m s at t = 0 , what is the velocity in m/s at t=3.0s? a. –2.0 b. –4.0 c. –3.0 d. +1.0 e. –5.0 2kg π /4 t (s) 4 8 1 2 3 4 F (N) 0 –4 –8 x
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Andrzej Czajkowski Czajkowski PHY1321/1331 exam Page 3 out of 10 9. The total work done by the gas in one cycle of the thermal engine A. is always 0. B. is independent of the path. C. is equal to the change of internal energy of the gas. D. is equal to the amount of heat transferred to the gas from the hot reservoir. E. is equal to the area enclosed by the loop on a PV diagram.
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