45. A particle moves along the x-axis under the influence of a potential energy function U(x) = x4 - 8x2. Which of the following values of x correspond to positions of stable equilibrium?(A) x = 0(B) x = +2(C) x = -2(D) x = +2 and x = -2(E) x = 0, x = +2, and x = -2

45. A particle moves along the x-axis under the influence of a potential energy function U(x) = x⁴ - 8x². Which of the following values of x correspond to positions of stable equilibrium?

(A) x = 0

(B) x = +2

(C) x = -2

(D) x = +2 and x = -2

(E) x = 0, x = +2, and x = -2

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統計： A(0), B(0), C(1), D(0), E(2) #3847821

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2026/07/07

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48. A bullet of mass m moving horizontally with initial speed vo strikes a stationary block of mass M that is suspended from the ceiling by a light string, forming a pendulum. The bullet becomes embedded in the block immediately upon impact, and the combined object swings upward to a maximum vertical rise of h as shown on the right. Air resistance is negligible. Which of the following statements is correct? (A) The collision between the bullet and the block is elastic. ///// Vo h m M (B) The mechanical energy of the entire process is conserved. (C) The linear momentum of the block is conserved during the entire process. (D) The maximum height is (E) The mechanical energy lost during the collision is

45. A particle moves along the x-axis under the influence of a potential energy function U(x) = x⁴ - 8x². Which of the following values of x correspond to positions of stable equilibrium?

(A) x = 0

(B) x = +2

(C) x = -2

(D) x = +2 and x = -2

(E) x = 0, x = +2, and x = -2

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