The flaw on 1. knowledge
The " flaw " that some choices inscribe goes out to go up in ABC, main body is used to ABC misapplication or fault now, theorematic to the rule understanding does not reach the designated position, not clear to component character wait for a respect.
Show lever to be in horizontal towards the left, perpendicular stop at the Cong Jing below the action of Heng Li F of lever when beginning to be apart from L along slideway motion, speed is achieved fitly the biggest (the lever in athletic process keeps perpendicular with slideway from beginning to end) . The resistor that sets lever to receive circuit is R, slideway resistor not plan, gravitational acceleration size is G. Criterion this process ()
A. The speed maximum of lever is
B. The n that has shed resistor R is
C. The result the sum that the work that Heng Li F does and attrition force do is equal to the change of lever kinetic energy to measure
D. The work that Heng Li F does and the change that bring the result the sum that times force does to be more than lever kinetic energy are measured
Flaw: The total resistor in return circuit using when the electric current in calculating return; The metabolic amount that combines the result of outside force to be equal to kinetic energy is in principle of energy.
Teach: This problem is a computation originally kind choose a topic, however because of capturing the flaw on knowledge need not calculate reach quickly right answer. Compared with the basis the problem sets the oldest rate of lever of conditional plan cipher out, n that has shed resistor R, redo gives judgement to want a lot of faster.
A. When switch park 1, 2 when, the L1 after stability, L2 two bulb all shine and brightness is identical
B. When switch park 1, 2 when, the L1 after stability, L2 two bulb all shine, and L1 is brighter than L2
C. When switch park 3, 4 when, after stability, if increase only,hand in change voltaic frequency, criterion L1 pales, l2 brighten
D. In switch park 3, the instant of 4, l2 gives off light instantly, and L1 brightness increases slowly
Flaw: Inductance connects dc block to communicate, capacitance lies between dc block to communicate.
Teach: Should inscribe main check inductance and capacitance to be opposite the character of dc and communication, groovy practice is park of switch of analysis of one by one 1, 2 and park 3, after the instant of 4 and stability, bulb shines, the metabolic circumstance of bulb brightness. Should cost apparently many.
2. problem does medium flaw
The " flaw " that some choices inscribe appears in thematic itself, the requirement that often sets in order to inscribe appears, if can be captured, can break through examination questions quickly, gain a mark.
A. The slippery acceleration on the car is more than gliding acceleration
B. The car carries the quality of carry cargo content must be affirmatory every time
C. The result that attrition obstruction overcomes to do in Cheng of the glide on the car is less than the result that attrition obstruction overcomes to do in Cheng of the glide below the car
D. Car and goods slip from top in the process of the nadir, reductive gravity potential energy is total the stretch potential energy of translate into bedspring
Flaw: The orbit with the not smooth " in the title "
Defeat analyse: Since orbit is not smooth, car and goods slip from top in the process of the nadir, have attrition power business surely, aux will be able to measures translate into internal energy. Reason option D is wrong certainly.
Teach: With respect to this problem character, if can capture the orbit " with the not smooth " in problem doing this one flaw, d of fast eduction option, won't err should be inscribed, not better than is chosen not complete, and unapt choose a fault and must not divide. For this poorer to the foundation student, it is a technical ability that enhances a mark effectively.
isosceles triangle cant is fixed go up in horizontal, one enough the two side that long small qualitative silken band has crossed the topmost shop of oblique plane to be put in oblique plane, attrition is not had between silken belt and cant. It is quality M, M(respectively now
) Xiao at the same time put down gently is in content piece oblique plane on the silken belt of two side. Two content piece as equal as the kinetic friction factor between silken belt, and the biggest static friction force and volume of sliding friction power are equal. In
Horn takes the case of different value, following statement has correctly ()
A. Two content piece the bulk that gets attrition power always is equal
B. Two content piece impossible relatively silken belt is dormant at the same time
C. M happens impossibly relative to silken belt slip
D. M is impossible that opposite cant slides up
Flaw: The " in the title pledges gently silken belt "
Defeat analyse: The meaning of the meaning of small qualitative silken band and light rope, small staff is same, it is the quality that takes no account of oneself, can think
, no matter move,take,
, reason silken tape gets resultant force for 0, attrition " is not had between " silken belt and cant again, the attrition power between reason M, M and silken belt is certain size is equal, option A is correct. Teach: This problem is in in those days notch in the university entrance exam very low, notch on average be not worth 1 minute, it is a very difficult choice problem really, can single out right answer to not allow really easy, beautiful very much time will analyse this problem to also do not answer to be able to reach surely right answer. But if be good at capturing the flaw in the title, unapt notch so low, also won't spend too much time, most at least can get 2 minutes.
The flaw on 3. logic
The " flaw " that some choices inscribe appears on the logistic relation of option, if can be captured, can save time already, still can raise the possibility that becomes pair of examination questions.
, the orbit of homocentric round metal that the centre of a circle is with O in A, C and magnetic field is contacted from beginning to end good. The capacitor for C receives one capacitance to go up in orbit, if plan institute is shown, the axis is with O inside as perpendicular as magnetic field plane when metallic lever, with angular velocity
Divide evenly of suitable hour hand when fast roll ()
A.
B.
C. Capacitor takes n
D. If join between EO an ideal volmeter, criterion voltage states number is 0
Flaw: Of 4 option state on occurrence flaw
Defeat analyse: Analyse 4 option discovery, option A and option B or are wrong, or has one correct, option D is wrong for certain, because of metallic lever rotational cut magnetism feels line, be equivalent to power source, join between EO an ideal volmeter, volmeter has certainly show number. Come so, c of OK and certain options is correct certainly.
Teach: Should inscribe problem of check roll cut, it is more difficult one is nodded, need knows to turn cut produces the principle of electromotive force and verdict, have consideration, make judgement next. If can capture the logical flaw between thematic option, can single out an answer quickly, if take,hold forbid option A and option B, can not make judgement, pick a key only, and get 2 minutes.
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