所屬科目:轉學考-物理
2. Which is not correct to apply Newton's law?(A) All measurements should be made in an inertial reference frame; (B) The interacting particles can not be accelerating; (C) No virtual force (e.g., the Coriolis force) is involved; (D) All; (E) None.
7. A rope of mass M and length L hangs vertically.What is the time T needed for a pulse to travel from the bottom end to the support? (A) (B) (C) (D) 2 (Lig); (E) None.
10. One mole of an ideal monatomic gas is taken around the reversible cycle shown in Figure.1 (on the right). What is the efficiency of this "heat engine"? (A) 4/21; (B) 5/14; (C) 6/11; (D) 7/34; (E) None.
11. A point charge Q is placed at one corner of a Gaussian surface in the form of a cube of side L. What is the total "electric flux"- through this Gaussian surface in terms of Qlε o? (A) 0; (B) 1/8; (C) 3/4; (D) 5/6; (E) None.
13. A conductor has a surface charge density σ C/m2. The force per unit area on the surface is (A)0;(B) σ2/2εo N/m2;(C) σ2/εo N/m2;(D)2σ2/εo N/m2;(E) None.
17. Which is not an appropriate pair of analogy between mechanical and electrical quantities of the oscillating systems?(A).xQ;(B)vI;(C)mC;(D)FV; (E) None.
20. A laser beam of intensity S and cross-sectional area A is completely absorbed by a particle of mass m for a period△t . What is the change in speed of the particle? (A)SA△t/ m c ; (B) SA△t /m ; (C) SA /mc ; (D) SA△t/ c ; (E) None.