Download e-book for kindle: CliffsAP Physics B & C by James R. Centorino

By James R. Centorino

The complete advisor to the next rating at the Physics B & C AP® checks
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About the contents:
Part I: creation to the AP Physics B & C tests <UL> * basic description of the tests
* layout and scoring information
* commonly asked questions
Part II: research of examination parts: a number of selection and unfastened reaction Sections <UL> * complete research of every query sort for B and C exams
* profitable options for every try out area
* In-depth reports of vectors, forces, movement, thermodynamics, and waves
* assurance of geometric optics, fluid mechanics, atomic and nuclear physics, and electrical and magnetic fields and forces
* pattern questions with answers/explanations
Part III: four Full-length perform checks with solutions and motives (2 for every attempt)
AP attempt Prep necessities from the specialists at CliffsNotes

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Example text

5°. 3. (a) This is actually a torque problem, in which the force times the distance from the pivot on the left must equal the force times the distance from the pivot on the right. Since the force is the weight, mg, the g will cancel, and it is only necessary to multiply the mass times the distance on each side and set them equal: (25kg)(50cm) = (40kg)(X). 3 cm to the right of the pivot. 2 cm from the right end (c) i. (25kg)(40cm) = (40kg)(X). X = 25 cm right of the pivot ii. (35kg)(40cm) = (40kg)(X).

Describe the resultant situation. Solution Now there is a net force of 10 N in the counterclockwise direction, which causes a resultant counterclockwise torque. The wheel accelerates in the counterclockwise direction. Its angular acceleration α would be found by knowing the mass and radius of the wheel, using the relationship τ = Iα = Fr. It is important to note that an object can be in one type of equilibrium but not the other. A car, for example, may be accelerating in a linear direction but not spinning.

5 m and mass of 10 kg sustains forces of 5 N (perpendicular to the radius in a counterclockwise direction) and 10 N (perpendicular to the radius in a clockwise direction). Describe the resulting motion of the wheel about its axle. 5 m Axle 5N Solution Two opposing torques are acting on the wheel, one being stronger than the other; therefore, a net torque is acting on the wheel, causing it to accelerate in a rotational fashion. There is a net force of 5 N clockwise, which will cause the wheel to rotationally accelerate in the clockwise direction.

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CliffsAP Physics B & C by James R. Centorino

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