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1. Which of the following is a correct unit for Newton's gravitational constant?
(A)
(B)
(C)
(D)

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2.Which physical quantity in a system is conserved if the only force exerted on the system is aconserved force?(A) momentum (B) angular momentum (C) mechanical energy (D) energy potential

3. If a free electron with charge -e and mass m moving at speed v enters a region with a magnetic field and makes a circular motion of radius r, what is the magnitude of the magnetic field? (A) (B) (C) (D)

4. It is known that water is considered incompressible. However, the water stream from the faucet is usually narrower at the bottom than at the top. Which of the following mechanisms best explains this phenomenon? (A) electric force (B) magnetic force (C) mass conservation (D) momentum conservation

5. An ant of mass m rests on a stationary wheel of radius r with inertia I = cr2 before moving counterclockwise with speed v. If the rotational friction of the wheel is negligible, how much angle does the wheel turn when the ant passes its original spot on the wheel for the first time? (A) (B) (C) (D)

6. Assuming the exit speed of cannonballs is always the same when fired from the cannon. If the angle of the cannon is φ when aiming at a target 800 m away, what is the condition on angleθ when aiming at 300 m away?(A) sin(2θ) =sin(2φ) (B) cos(θ) =cos(φ) (C) tan(θ) =tan(φ) (D) tan(θ) =tan(φ)

7. The heat capacity of object A is three times that of object B, and the initial temperatures of object A and object B are 300 K and 600 K, respectively. What is the final temperature of both objects if they are in thermal contact and isolated from the environment? (A) 430 K (B) 525 K (C) 400 K (D) 375 K

8. Which of the following descriptions about an inelastic collision is true?(A) momentum is not conserved, but kinetic energy is conserved.(B) total mass is not conserved, but momentum is conserved.(C) neither kinetic energy nor momentum is conserved.(D) momentum is conserved, but kinetic energy is not conserved.

9. A stationary source of sound emits a sound wave of frequency f. If a flight flies toward the source at the speed of sound, what frequency does the flight observe? (A)f/2 (B)f (C) 2f (D) cannot hear the sound

10. An 40-N uniform plank leans against a frictionless wall (as shown in Fig. 1). What is the torque (about point P) applied to the plank by the wall?(A) 60 m.N (B) 30 m N (C) 120 m N (D) 80 m N

11. A wooden ball floats in a fluid of density 13.5 g/mL with 20% of its volume under the fluid. What is the density of the wood? (A) 5.0 g/ml (B) 2.7 g/mL (C) 10.8 g/mL (D) 3.4 g/mL

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