13. It is better to send V
(A) t
(B) t
(C) t
(D) t
(E) t

1. A boy wants to row across a river in the shortest possible time. He can row at 2 m/s in still water and the river is flowing at 1 m/s. At what angle θ should he point the bow (front) of his boat? (A) 30° (B) 45° (C) 60° (D) 53° (E) 90°.

2. The diagram below represents a uniform ladder leaning safely against a real wall. Which of the following diagrams most correctly represents all the forces acting on the ladder? (A)(B) (C)(D)(E)

3. At time t = 0 a particle starts moving along the x axis. If its kinetic energy increases uniformly with t, the net force acting on it must be: (A) constant (B) proportional to (C) proportional to 1/ (D) proportional to t (E) proportional to 1/t.

4. A 0.20-kg particle moves along the x axis under the influence of a conservative force field. The potential energy is given byU(x) = (8.0J/m²)x² + (2.0J/m²)x⁴, where x is in coordinate of the particle. If the particle has a speed of 5.0 m/s when it is at the origin, what is its speed when it is at x =1.0 m? (A) 0 (B) 2.5 m/s (C) 7.9 m/s (D) 11 m/s (E) The particle can't reach the position x = 1.0 m.

5. A 3.0-kg and a 2.0-kg cart approach each other on a horizontal air track. They collide and stick together. After the collision, their total kinetic energy is 40 J. The speed of their center of mass is: (A) 2.8 m/s(B) 4.0 m/s(C) 5.2 m/s(D) 6.3 m/s(E) 0 m/s.

6. A 16 kg block is attached to a cord that is wrapped around the rim of a flywheel of diameter 0.40 m and hangs vertically. The rotational inertia of the flywheel I is 0.50 kg.m². When the block is released and the cord unwinds, the acceleration of the block is:(A) 0.15g (B) 0.56g (C) 0.84g (D) g (E) 1.3g.

7. A rigid and uniform rod of length L and mass M is free to rotate about the axis through its center and perpendicular to the rod (rotational inertia I=(1/12)ML²). A small particle also of mass M is moving perpendicular to the rod at a speed v, and it strikes the rod a distance (1/4)L from the center. If the particle sticks firmly to the rod, find the angular velocity (ω) of the system about the fixed axis after the collision. (A) 1.71 v/L (B) 2.16 v/L (C) 4.00 v/L (D) 4.22 v/L (E) 4.60 v/L.

8. The displacement of an object oscillating on a spring is given by x(t) = xmcos(wt +Φ). If the object is initially displaced in the negative x direction and given a negative initial velocity, then the phase constant Φ is between: (A) 3π/2 and 2π radians (B) π and 3π/2 radians (C) π/2 and π radians (D) 0 and π/2 radians (E) none of the above (Φ= π).

9. The pressure of an ideal gas is doubled in an isothermal process. The root-mean-square speed of the molecules: (A) does not change (B) change (increase) by a factor of (C) change (decrease) by a factor of 1/ (D) change by a factor of 2 (E) change by a factor of 1/2.

10. An heat engine operates between 200 K and 100 K. In each cycle, it takes 100 J from the hot reservoir, loses 25 J to the cold reservoir and does 75 J of work. This heat engine violates: (A) both the first and the second law of the thermodynamics； (B) neither the first nor the second law of the thermodynamics (C) the first law but not the second law of the thermodynamics (D) the second law but not the first law of the thermodynamics (E) can't not answer without knowing more information.

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