2.An imaginary closed surface S of radius R is centered on the origin. A positive charge is originally at the origin, and the flux through hte surface is . The positive charge is slowly moved from the origin to a point R/2 away from the origin. Now the flux is .
(A)
(B)
(C)
(D)
(E)

5.A clear sheet of polaroid is placed on top of a simmilar sheets so that their polarizing axes make an angle of 30° with each other. The ratio of the intensity of emerging light to incident unpolarized light its . (  cos30^o ,sin30^o     )
(A)1/4
(B)1/3
(C)1/2
(D)3/4
(E)3/8

6.What is the intensity ratio of sound for the heavy truck at 1.5m(90dB) to normal conversation at 1m(60dB)?
(A)1.5
(B)10³
(C)0.67
(D)10³⁰
(E)

11.An ideal monatomic gas undergoes a quasistatic expansion to one-third of its initial pressure. Find the ratio of the final volume to the initial volume if the process is adiabatic. (⁰ = Cp / Cv 5/3 for ideal monatomic gas, log3 0.5)
(A)
(B)10^0.3
(C)10^0.5
(D)10^0.6
(E)10^0.7

12.A block with mass m 250g is fastened to a spring with spring constant k 85N/m. The system is excited to oscillate. Assume that there is a velocity-dependent damping force F_d -bv in the system with b 70g/s. How long does it take for the amplitude of the damped oscillation to drop to half its initial value? (ln2 0.693)
(A)3s
(B)4s
(C)5s
(D)6s
(E)7s

13.A thin rod whose length L is 10cm and whose mass m is 100g, suspended at its midpoint from a long wire. Its period T_a of angular SHM (Simple Harmonic Motion) is measured to be 2.50 s. An irregularly shaped object is then hung from the same wire and its period T_b is found to be 5.0s. What is the rotational inertia of the irregular object about its suspension axis? (The rotational inertia for a rod is   mL²  )
(A)
(B)
(C)
(D)
(E)

14.In high-speed motion through air, the resisting force is approximately  F = cv² . For a human body falling through air in a spread-eagle position, c is about 0.25kg/m. An 80kg sky diver jumps out of an airplane and reaches terminal speed before opening the parachute. What is the terminal speed?
(A)49m/s
(B)56m/s
(C)72m/s
(D)84m/s
(E)98m/s

21.A dipole for which p m is in a uniform field E 7 10⁴ N /C  . What is the external work needed to rotate the dipole from alignment with the field to angle 60° to the field? ( cos60 ^o 0.5;sin 60^o 0.9   )
(A)
(B)  
(C)  
(D)
(E)

22.A 5A current flows in a circular loop of radius 2cm. The axis of the loop is at 30° to a uniform field 0.06T. What is the magnitude of the torque on the loop?
(A)
(B)
(C)
(D)
(E)

24.What minimum frequency of light is needed to eject electrons from a metal whose work function is 4.3 )
(A)  
(B)
(C)
(D)  
(E)

25.Through how many volts of potential difference must an electron be accelerated to achieve a wavelength of 0.28nm? ( ́ )
(A)12V
(B)16V
(C)19V
(D)31V
(E)34V

2. What is this body’s moment of inertia I about axis through disk A?
(A) 1.8 kg · m
(B) 1.8 kg · m²
(C) 4.0 kg · m
(D) 4.0 kg · m²
(E) 5.0 kg ·m²

3. The figure shows a plot of the time-dependent force acting on a particle in motion along the x-axis. What is the total impulse delivered to the particle?
(A) 0 kg · m/s
(B) 1 kg · m/s
(C) 2 kg · m/s
(D) 3 kg · m/s
(E) 4 kg · m/s

34. Two blocks are in contact on a frictionless table. A horizontal force is applied to the larger block. F = 100 N, m₁ /m₂ = 2. The force acting on the small block from the larger one is,
(A) 100/2 N
(B) 100/3 N
(C) 100/4 N
(D) 100/6 N
(E) 100/8 N

45. There are two parallel-plate capacitors with same plate area A. As the figure illustrated, C₁ is filled with two materials of dielectric constants κ and 2κ, while C₂ is filled with only one material. The capacitance ratio C₁ / C₂ is___________ .
(A) 0.5
(B) 1.0
(C) 1.5
(D) 2.0
(E) 2.5

46. What is the equivalent resistance of the circuit in the figure?
(A) 8.6 Ω
(B) 13.8 Ω
(C) 3.6 Ω
(D) 42.4 Ω
(E) 19.6 Ω

50. The sliding bar has a length of 1.0 m, and moves at 3.0 m/s in a magnetic field of magnitude 0.5 T. This could induced motional emf. If the resistance in the circuit is 1.0 Ω, what is the power delivered to the resistor if the current goes counterclockwise around the loop?
(A) 0.85 W
(B) 1.35 W
(C) 1.80 W
(D) 2.25 W
(E) 2.55 W

52. The figure shows the energy levels for an electron in a finite potential energy well. If the electron makes a transition from the n = 3 state to the ground state, what is the wavelength of the emitted photon?
(A) 2.3 nm
(B) 3.0 nm
(C) 5.3 nm
(D) 5.7 nm
(E) 6.0 nm

60. A standing sound wave pattern on a long string is described by y (all in SI unit). The distance between two nodes is ____________.
(A) 0.1 m
(B) 0.2 m
(C) 0.3 m
(D) 0.4 m
(E) 0.5 m