2. The figure shows a horizontal force of magnitude F = 54 N applied to one of three blocks with these masses: = 2.0 kg, = 5.0 kg, and = 2.0 kg. The blocks move rightward across a frictionless floor. What is the magnitude (N) of the force on block B due to block A?_____

1. A particle goes through uniform circular motion. At one instant, it is at the xy coordinates (-2.0 m, 3.0 m), has velocity v = -4.0 j m/s, and has acceleration a = +2.0 i m/s². What is the x coordinate (m) of the center of the circle?_____

3. The figure shows block 1 (with velocity 10 m/s) sliding into a stationary block 2 (mass m2 = 6.0 kg), which ends up with a velocity of = 5.0 m/s. The collision is elastic. What is the mass (kg) of block 1?_____

4. The figure is an overhead view of a 4.0 kg meter stick that can rotate around a pivot located at the mark of "20 cm". Four horizontal forces act on the stick (the forces maintain their orientations relative to the stick as the stick rotates). The stick starts from rest at time t = 0 s. What is its angular speed (rad/s) at time t = 6.0 s? Don't round-off early. For a uniform stick rotating around its center of mass, the rotational inertial is given by ML2/12, where M is the mass and L is the length._____

5. As shown in the figure, a block of mass M = 5.40 kg, at rest on a horizontal frictionless table, is attached to a rigid wall by a spring with spring constant k = 6000 N/m. A bullet of mass m = 9.50 × kg and speed v strikes and is embedded in the block. After the bullet is embedded, the block and bullet undergo SHM with amplitude 1.50 × m. What was the bullet speed v (m/s)?_____

6. The figure shows a cylinder that has an initial speed of 8.00 m/s at an initial height of h = 9.00 m. What is the normal force (N) acting on the cylinder when it reaches mid-height (level with the center) of the circular loop, which has a radius of 5.00 m? It rolls smoothly along the track. The cylinder's mass is 6.00 kg._____

7. Here are three pairs of waves that we can send along a string. Rank the pairs according to the amplitude of the resultant wave that would result on the string, greatest first._____ [Note:請依序排列,並加註大於、小於、或等於符號(＞, ＜, or =)]    Pair 1:    y1 = (4.0 mm) sin (6πx – 12πt + 0.7π)y2 = (4.0 mm) sin (6πx – 12πt + 0.7π)    Pair 2:    y1 = (4.0 mm) sin (3πx – 5πt + 0.2π)y2 = (4.0 mm) sin (3πx – 5πt + 1.2π)    Pair 3:    y1 = (4.0 mm) sin (2πx – 4πt)y2 = (4.0 mm) sin (2πx – 4πt + 0.5π)

8. The figure shows the cross section of a two-layer wall. The temperatures for the left face, interface, and right face are T₁ = 30 °C, T2 = 20 °C, and T3 = -10 °C. Layer 1 has thickness 0.20 m; layer 2 has thickness 0.60 m. What is the thermal conductivity k of layer 2 in terms of that of layer 1? That is, what goes in the blank here: k2 =_____ k₁?

9. A Carnot engine with a high-temperature reservoir is at 380 K operates at an efficiency of 25.0%. By how much (K) should the temperature of the low-temperature reservoir be changed to increase the efficiency to 35.0%?_____

10. Two identical point charges are placed symmetrically at the same distance d from the origin, as shown in the figure. Four labelled points (1, 2, 3, 4) are indicated on the diagram. At which of these labelled points does the net electric field point in the + y-direction?_____

11. The figure shows three arrangements of charged arcs forming a circle or part of a circle. The radii are identical. Rank the arrangements according to the net electric potential at the center of curvature, most positive first, most negative last. _____[Note:請依序排列,並加註大於、小於、或等於符號(＞, ＜, or =)]

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