3. A force varies as = xy²î. What is the work done by the force along the paths OB? 

1. A physical equation A =5-sin(BC), where A has the dimensions L/M, and C has the dimensions L/T. So B has the dimensions ______

2. A 18-N horizontal force is applied to a 40-N block initially at rest on a rough horizontal surface. If the coefficients of friction are = 0.5 (static) and = 0.4 (kinetic), the magnitude of the frictional force on the block is ______

4. Same conditions as the above question, does the force = xy²î satisfy the criterion for being conservative (yes or no)? ______

5. A particle of mass m travels in a horizontal circle on a frictionless table. The centripetal force is provided by a string, attached to two bodies of equal mass M, which passes through a hole in the table. The radius of the circle is r. If one of the hanging masses is removed, the new radius will be ______

6. Water fills a length L of a U tube. The water is slightly displaced and then allowed to move freely. The liquid will then execute a simple harmonic motion. What is the angular frequency (ω) of the oscillation? 

7. One mole of an ideal monatomic gas is taken around the reversible cycle as shown in the figure. The isothermals are at 500 K and 300 K. Find the efficiency of the engine.

8. Same conditions as the above question, find the total entropy change of the heat engine from b to a through the process of b→ c → d → a.

9. The figure shows three identical conducting spheres with these initial charges: A, -12Q, B, +8Q, C, 0. Here is the procedure for connecting and then disconnecting spheres with wire: Step 1: connect A and C and then disconnect； Step 2: connect B and C and then disconnect, moving C far away； Step 3: connect A and B and then disconnect. A and B have a center-to-center separation r. What is the magnitude of the final force between those two spheres? Answer by writing what goes in the blank in this equation: F = _kQ² / r².

10. The figure shows three situations in which the same charged particle is surrounded by a concentric Gaussian sphere. (1) sphere has radius R (2) sphere has radius 2R  (3) sphere has radius 2R and also surrounds a neutral metal spherical shell Rank the three situations according to the magnitude of the electric flux through the surface of the Gaussian sphere, greatest first. NOTE:請依序排列,並加註大於、小於、或等於符號(＞, ＜, or =)。

11. In the following figure, we have V = 9.0 V, C2 = 3.0 µF, and C4 = 4.0 µF, and all the capacitors are initially uncharged. When switch S is closed, a total charge of 20 µC passes through point a and a total charge of 8.0 µC passes through point b. What is capacitance C3 (uF)? 

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