AP PHYSICS: Rotational Kinematics

Q: A 25.0 kg grindstone disc with a 0.250 m radius ( r ) rotates with an angular speed ( ω ) of 30.0 rad/s. When power to the disc is shut off, it decelerates and comes to rest over the course of 20.0 s. When the grindstone is shut off, a speck of dust

AP PHYSICS: Final Speed of a Block / Incline System

Q1 : A mass ( m1 ) of 1.20 kg is situated at the bottom of an incline that is 30o to the horizontal. At the top of the incline, there’s a 0.500 kg disk that is kept fixed by a frictionless axle. A cord is placed over the disk and used to lift a

AP PHYSICS: Pulleys, Torque, Tension, and the Moment of Inertia

Two spherical bearings of mass ( m1 ) and ( m2 ) are attached by belt to a pulley that is situated between them. An electric motor is also attached to the pulley, and it is positioned between these masses. When the motor is turned on, the pulley provides 15.0 N of tension on the

AP PHYSICS: Heat Transfer in a Calorimeter

Q: A kilogram ( kg ) of water with a temperature of 20o C is poured into a calorimeter. Subsequently, an unknown mass of stainless steel with a temperature of 80o C is placed in the water. What must the mass of the steel be in order for the temperature of the water to rise

AP PHYSICS: Force and Deceleration

Q: A vehicle weighing ( Fw ) 17.08 kN moves at a constant velocity ( v ) of 35.8 m/s. At some point, the driver decides to let the vehicle coast in neutral, during which air drag causes it to decelerate to 22.4 m/s in 24 s. ( a ) What is the magnitude of

STATIC EQUILIBRIUM: Concurrent Force Systems

Q1: A 200 N force ( F ) is used to stabilize a system of pulleys within an industry’s weighing station. The system’s weighing receptacle is filled with a quantity of liquid that results in 150 N of force exerted in the vertical direction. If the pulley to the right is at a 20o angle

INTRODUCTION TO ELECTRONICS: Electron Volts vs. Kilowatt Hours ( Part 1 )

Although related, voltage ( V ) and power ( P ) are fundamentally different entities. The voltage within an electrical system is a measure of how many joules ( J ) of energy each coulomb ( C ) of charge ( q ) carries with it. Power is a measure of the rate at which

INTRODUCTION TO ELECTRONICS: Metric Prefix Conversions ( Part 2 )

The number 1 can be formed via the establishment of a ratio of logically related quantities: A = A ( A / A ) = 1 A = B ( A / B ) = 1 And, ( B / A ) = 1 Furthermore, the product of any number multiplied by 1 is the

INTRODUCTION TO ELECTRONICS: Metric Prefix Conversions ( Part 1 )

The process by which metric prefixes are converted from one value to another is based upon the following premise: 1 x 1 = 1 This premise can be easily applied to statements of truth that involve variables: a = a ( a / a ) = 1 b = b ( b / b )

INTRODUCTION TO ELECTRONICS: Electrical Quantities and their Corresponding SI Units

The International System ( SI ) has established internationally accepted values for physical quantities. These agreed-upon values constitute the building blocks of many scientific fields of study, including electronics. Each quantity in question is accompanied by a symbol, and each symbol can be substituted with an SI unit that gives it meaning. Consider the following