【全部】 - 學士後西醫物理及化學2024~2020難度:(71~80)-阿摩線上測驗

阿摩：辛苦一陣子，享受一輩子

10分

(8 秒)

模式:循序漸進模式
【全部】 - 學士後西醫物理及化學2024~2020難度:(71~80)

繼續測驗

再次測驗下載

下載收錄

1(A).

4. A block of mass m sliding down an incline at constant speed is initially at a height h above the ground, as shown in the figure. The coefficient of kinetic friction between the mass and the incline is μ.If the mass continues to slide down the incline at a constant speed, how much energy is dissipated by friction by the time the mass reaches the bottom of the incline?
(A) mgh/µ
(B) mgh
(C) µmgh/ sin θ
(D) mgh sin θ
(E) 0

2(A).

5. A baseball is thrown vertically upward and feels no air resistance. As it is rising
(A) both its momentum and its mechanical energy are conserved.
(B) both its momentum and its kinetic energy are conserved.
(C) its kinetic energy is conserved, but its momentum is not conserved.
(D) its momentum is not conserved, but its mechanical energy is conserved.
(E) its gravitational potential energy is not conserved, buts its momentum is conserved.

3(A).

11. Soap bubble is colorful. What is the phenomenon of the colorful reflection appeared in the thin films?
(A) Diffraction
(B) Dispersion
(C) Interference
(D) Refraction
(E) Total refraction

4(A).

13. Which of the following is correct for visible light through a prism?

(A) a and d
(B) c and b
(C) c and d
(D) a and b
(E) None of these

5(A).

38. A 2-kg block slides down a frictionless incline from point A to point B. A force (magnitude P = 3 N) acts on the block between A and B, as shown in the figure Points A and B are 2 m apart. If the kinetic energy of the block at A is 10 J, what is the kinetic energy of the block at B? (Gravitational acceleration g = 10 m/s² )

(A) 17 J
(B) 20 J
(C) 24 J
(D) 27 J
(E) 37 J

6(A).

43. A solid melt at 100°C by absorbing 2450 kJ heat. How much is the entropy change in this melting process?
(A) 8.23 kJ/K
(B) 4.32 kJ/K
(C) 7.43 kJ/K
(D) 6.57 kJ/K
(E) 5.69 kJ/K

7(A).

44. What is the efficiency if a Carnot engine transfers 9.5×10³ J of energy from a hot reservoir during a cycle and dumps 2×10³ J heat to a cold reservoir?
(A) 0.69
(B) 0.84
(C) 0.79
(D) 0.65
(E) 0.72

8(A).

45. Water pressurized to 3.5 × 10⁵ Pa is flowing at 5.0 m/s in a horizontal pipe which contracts to 1/3 its former area. What are the pressure and flow speed of the water after the contraction?
(A) 2.5 × 10⁵ Pa, 15 m/s
(B) 3.0 × 10⁵ Pa, 10 m/s
(C) 3.0 × 10⁵Pa, 15 m/s
(D) 4.5 × 10⁵ Pa, 1.5 m/s
(E) 5.5 × 10⁵ Pa, 1.5 m/s