Explore BrainMass

Applied Physics

Applied physics, also known as engineering physics, is the connecting study between physics as a pure science, mathematics and engineering. Fundamental physics is combined with problem solving and engineering skills to brooded applications. This interdisciplinary knowledge is designed for continuous innovations occurring with technology.

The term “applied” is distinguished from “pure” by the motivation and nature of the research. Applied physicists conduct research to develop new technologies or solve engineering problems by the application of basic scientific principles; whereas physicists conduct research to prove new theories and discover new abstract concepts. For example, Einstein’s special theory of relativity was discovered by pure physicists. The design of fiber optic technology is an applied physics discovery.

The field of applied physics has a wide variety of research areas. Astronomy, Astrophysics and Relativity and Condensed Matter Physics and Optics are just a few examples of the vast range of research areas. These research areas are concerned with the potential for new technology or practical applications.



Title Image Source: Wikimedia Commons

Categories within Applied Physics

Medical Physics

Postings: 5

The application of physics concepts and methods in medicine.

Computational Physics

Postings: 18

The study of numerical algorithms to solve quantitative theory which already exists.

Cellular Phone vs. Microwave Oven

The average output power of a GSM cellular phone is 1.0W when it is "ON". The phone can be treated as a point source of E-M waves emitting spherical waves. (a) Calculate the intensity and peak electric field E(max) of the phone's E-M waves in your brain, which is about 5.0cm away from the phone when it is applied directly ag

Parameters of a Transformer

An ideal step-down transformer is used to convert the AC voltage from the power line at 120V to 5.0V in an adapter for your laptop computer. (a) The primary coil has 2000-turns, how many turns are in a secondary coil? (b) If the average power consumption of your laptop is 80W, what is the average current in the primary coil

Inductive Circuit Analysis

A 400-turn solenoid is 25-cm long and 3.0-cm in diameter. (a) What is the inductance of the solenoid? (b) The solenoid is then connected a circuit as shown in the figure, where e0=24.0V, R1=6.0ohm, R2=4.0ohm, R3=8.0ohm. Find current I1, I2 and I3 immediately after the switch is first closed. (c) Find I1, I2 and I3 after

Ohm's Law Problems

Table 1. Resistor values for stated value and measured value for R1 and R2 in Ohms. R1 (Ω) R2 (Ω) Stated Value 360 180 Measured Value 362 184 Table 2. Measured Currents and Voltages for series and parallel configuration with calculated resistances. Configuration I (mA) I1 (mA) I2 (mA) V (V) V1 (V) V2 (V) R (

Comparisons of Resistance

The instructions for an electric hedge clipper suggest that a 20-gauge cord with a cross-sectional area of 5.2 x 10-7m2 extension cord can be used for distances up to 35m, but a thicker 16-gauge with a cross-sectional area of 13 x 10-7m2 cord should be used for longer distances, to keep the resistance of the wire as small as pos

Significant Figures and Boat Travel Distance

See the attachment. 1. 0.00325 x 10-8 cm equals A. 3.25 x 10-12 mm B. 3.25 x 10-11 mm C. 3.25 x 10-10 mm D. 3.25 x 10-9 mm 2. You measure the length and width of a rectangle to be 1.125 m and 0.606 m, respectively. You calculate the rectangle's perimeter by adding these and multiplying by two. Your calculator's dis

dynamics and inertia

The vehicle s used to transport supplies to and from the bottom of the 25-present grade. Each par of wheels one at A and the other at B has a mass of 140 kg with a radius of gyration of 100 mm. The total mass of the vehicle s 520 g. The vehicle is released from rest with a restraining force T of 500 N n the control cable which p

Pressures problems are featured.

1.) The water in the tank is at a guage pressure of 216,302 Pa If the bottom of the tank has an area of 0.6m^2 what is the force on the bottom of the tank. 2.) A Viewing window in an aquarium is 62 inches wide and 56 inches high. If the average pressure inside the water tank is 16psi. What is the outward force on the wind

Differential Equation of Mass

The figure below shows a spring/dashpot/mass system, with an extra applied force, F. In terms of K, B, m, and F, what is the differential equation describing the deflection of the mass? What is the Laplace transfer function between input F and output x? See attached file for full problem description.

Applied vector and pulley problems

(See attached file for full problem description) 11. Consider two objects whose position vectors are given by r1 and r2 and whose momenta are given by p1 = m1v1 and p2 = m2v2 respectively. Show that in the special case that the center of mass of the two bodies is at rest at the origin (that is P = p1 + p2 = 0, and the positi

Physics help

(See attached file for full problem description) 1. A constant-volume gas thermometer is calibrated in dry ice (-80.0°C ) and in boiling ethyl alcohol (78.0°C ). The respective pressures are 0.900 atm and 1.635 atm. (Note that we have the linear relationship P = A + BT, where A and B are constants.) (a) What value of ab

Physics problem: work done

A gardener pushes a box of tools across a driveway by applying a 32.5 Newton force that pushes downward at an angle of 22.4 degrees with respect to the horizontal. How much work is done if the box moves 2.25 meters in the horizontal direction? I need to see each step and formula to solve this question.

Fourier series frequency response of a receptor to stretching

Stretch receptors in lungs are modeled as second-order systems whose input is the applied stretch, x(t), and output is the instantaneous firing frequency of the receptor, y(t). Assume that one such receptor can be described by the differential equation: d^2y/dt^2 + 2*d/dt + 4y(t) = 10x(t) +dx/dt Determine the frequency r

Water wave/Deep water waves

A water wave is called a deep-water wave if the water's depth is more than 1/4 of the wavelength. The speed of a deep water wave depends on its wavelength: v = sqrt((g.lambda)/2pi). Longer wavelengths travel faster. Let's apply to this to a standing wave. Consider a diving pool that is 5.0 m deep and 10.0 m wide. Standing w

Force and Angle

18. the leg and cast in picture (attached) weigh 220N (w1) Determine the weight w2 and the angle needed so that no force is exerted on the hip joint by the leg plus the cast. 41. The coefficient of static friction between a 3.00 kg crate and the 35.0 degree incline it sits on is 0.300. What minimum force (F) must be appl

Atwood Machine

Find the equation of motion for the Atwood machine depicted in the diagram.

What is the hydraulic force needed to lift a car?

What force must be applied to a small cylinder piston with a diameter of 0.32 m to lift a car weighing 12,000N that is supported by the piston in a large cylinder that has a diameter of 1.4m? Assume that there is a closed chamber in the common between the two pistons and that the chamber is filled with hydraulic oil.

Rotational kinetic

A horizontal 808 N merry-go-round is a solid disk of radius 1.56 m, started from rest by a constant horizontal force of 50.5 N applied tangentially to the edge of the disk. Find the kinetic energy of the disk after 2.96 s.

What is the tension in the rope?

The blue box in the figure has a mass of 38 kg. To the nearest newton, what is the tension in the rope? If the spring has a spring constant of 515 N/m, to the nearest tenth of a cm how far is it stretched?

Physics of a Baseball

An object in motion stays in motion until it comes into contact with a opposite greater or equal force.

Elongation of the rod

A force of 1.0 * 10^3 N is applied to a steel rod of length 1 m and a circular cross-section of area 10 cm^2. Find the elongation of the rod. Young's modulus for steel is 2.0 * 10^11 Pa.

Pascal's Principle: Hydraulic Dentist's Chair

Imagine a hydraulically operated dentist's chair having a mass of 200.0 kg, and in it is sitting a 54.8-kg patient. The large piston beneath the chair has a diameter of 5.00 cm, whereas the small piston, moved by a pedal on which the dentist steps, has a diameter of 1.00 cm. What is the pressure in the interconnecting fluid wh

Force of friction and pulling apart two books.

Two identical books each with k pages are placed on the table in a way that the each page of book A is between the pages of book b. The high half of book B is on top of book A. Given that 1) the coefficient of static friction on the surface of card A is mu; 2) Each page of the book has a mass of m; 3) Book A does not move f

Force and Center of Mass

A person holds a bowling ball in his hand with his forearm horizontal. The bowling ball has a mass of 5.10 kg and the mass of the forearm is 1.50 kg. The bicep muscle is attached to the bone of the forearm at a point d=3.00 cm from the elbow joint and the bowling ball is L=35.0 cm from the joint. Model the center of mass of the

Archimedes' Principle on a Body in Water

Hi. Can someone please walk me through how to do the following problem? A person with a mass of 81 kg and a volume of 0.089 m^3 floats quietly in water. (a) What is the volume of the person that is above water? (b) If an upward force F is applied to the person, the volume above water increases by 0.0018 m^3. Find the fo