到底在幹嘛😵‍💫

A better resolution for the two headlights of a car in a picture can be achieved by reducing (A) the separation of the headlights; (B) the wavelength of light; (C) the aperture diameter of the camera lens; (D) All; (E) None.

救我感恩您

Which is not an appropriate pair of analogy between mechanical and electrical quantities of the oscillating systems? (A) x➜ Q; (B) v ←➜1; (C) m← C; (D) F→ V; (E) None.

😀

(B) the current; (C) the sign and concentration of charge carriers; (D) All; (E) None. A particle of mass m and charge q is in a circular orbit (of radius R) normal to an external field B. What is proportional to the magnetic field created at the center of its orbit by the charge? (A) m; (B) q; (C) R; (D) B; (E) None.

救命啊

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 Q/ & o? (A) 0; (B) 1/8; (C) 3/4; (D) 5/6; (E) None. Which is not correct for the dielectric constant (x) of a substance? (A) It is a measure

哈囉，拜託誰能救一下

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. 3Po Por 4 a Q4 d Vo est C Q2 2%

要死了🥲

Which statement is not correct for the "shear modulus"? (A) It has the same dimension as the "pressure"; (Bt involves the application of two parallel forces of opposite directions along the same line; (C) It can not be defined for an ideal fluid; (D) All; (E) None.

在講什麼😀

A rope of mass M and length L hangs vertically. What is the time I needed for a pulse to travel from the bottom end to the support? (A) 0.5 (L/g)0.5; (B) (L/g) 0.5; (C) 2 (L/g) 0.5; (D) 2 (L/g); (E) None. Which statement in want for the 66t 220

啥🥲

What is the moment of inertia I for a uniform ring of radius R and mass M about an axis (perpendicular to the plane of ring) at its rim? (A) 0.5 MR2; (B) MR²; (C) 1.5 MR²; (D) 2 MR²; (E) None.

這題為何是B

Which pair of vectors is not always in parallel? (A) Velocity & linear momentum; (B) Angular velocity & angular momentum; (C) Net force & acceleration; (D) All; (E) None.

怎麼寫

If the energy needed to send an object (initially at rest on the earth's surface) to a maximum height H is a half of that for sending it into an orbit at the same height, what would be the value of H in terms of RE (the radius of the earth)? Ignore the earth's rotation. (A) 1/4; (B) 1/3; (C) 1/2; (D) 2/3; (E) None.