Saturday, September 29, 2012

TutorState.com: Physics Tutor in Brooklyn

Thursday, September 27, 2012

MCAT Physics Equation Lists (Formulas)

Memorize These!

Translational motion	x = x ₀ + v ₀ t + at²/2	V_ƒ = V_o + at
Frictional force	f _max = μ Ν	μ_k < μ_s
Uniform circular motion	F_c = ma_c = mv² /r	a_c= v² /r
Momentum, Impulse	I = F Δt = ΔM	M = mv
Work, Power	W = F d cosθ	P = ΔW/Δt
Energy (conservation)	E_T = E_k + E_p	E = mc²
Spring Force, Work	F = -kx	W = kx² /2
Continuity (fluids)	A v = const.	ρAv = const.
Current and Resistance	I = Q/t	R = ρL/A
Resistors (series, par.)	R_eq = R₁ + R₂ . . .	1/ R_eq = 1/ R₁ +1/ R₂
Sound	dB = 10 log ₁₀ (I/I₀ )	beats = Δ f
Kirchoff's Laws	Σi = 0 at a junction	ΣΔV = 0 in a loop
Thermodynamics	Q = mc Δ T	Q = mL
Torque forces	L₁ = F₁× r₁	L₂ = F₂ × r₂
Torque force at EQ	ΣF_x = 0 and ΣF_y = 0	ΣL = 0
Refraction	( sin θ₁ )/(sin θ₂ ) = v₁ /v₂ = n₂ /n₁ = λ₁ /λ₂	n = c/v

Memorize as Pairs

F = ma	F = qE	Similar Form
F = K_G ( m₁ m₂ / r² )	F = k ( q₁ q₂ / r² )
V = IR	P = IV	Paired Use
v_av = Δ d / Δ t	a_av = Δ v / Δ t	(avg vel, acc)
v = λ f	E = hf	(f = 1/T)
E_k = ½mv²	E_p = mgh	(kin, pot E)
Ρ = F/A	Δ Ρ = ρgΔh	(pressure Ρ)
SG = ρ substance / ρ water	ρ = 1 g/cm³ = 10³ kg/m³	(Spec Grav)
ρ = mass / volume	F_b = Vρg = mg	(buoyant F)
I_rms = I_max / √2	V_rms = V_max / √2	Root Mean Sq
1/ i + 1/ o = 1/ f = 2/r = Power	M = magnification = - i/o	Optics
Note: Specific gravity (SG) is equivalent to the fraction of the height of a buoyant object below the surface of the fluid.

Don't Memorize, Know How to Use...

Ρ + ρgh + 1/2 ρv² = constant	Bernouilli's Equation	Fluids in Motion
L = L₀ (1 + αΔ T )	Linear Expansion	Solids, Temp Δ
A = A₀(1 + γΔ T )	Area Expansion
V = V₀(1 + βΔ T )	Volume Expansion	β = 3 α
f_o = f_s (V ± v_o )/ ( V ± v_s )	Doppler Effect: when d is decreasing use + v_o and - v_s
V = Ed for a parallel plate capacitor	d = the distance between the plates
dF = dq v(B sin α) = I dl(B sin α)	Laplace's Law	RH rule
1/ C_eq = 1/ C₁ + 1/ C₂ + 1/ C₃ . . .	Capacitors in Ser. and Par.	C_eq = C₁ + C₂ . . .
Potential Energy ( PE ) = W = 1/2 QV	Work in Electricity	W = 1/2 CV²
ΔG = ΔH - TΔS	Gibbs Free Energy	ΔG° = -RTln K_eq

Atomic Physics

1) alpha (α) particle = ₂He⁴ (helium nucleus);

2) beta (β) particle = _-1e⁰ (an electron);

3) a positron ₊₁e⁰ (same mass as an electron but opposite charge);

4) gamma (γ) ray = no mass, no charge, just electromagnetic energy;

5) Δ m /Δ t = rate of decay where Δ m = change in mass, Δ t = change in time.

6) If the number of half-lifes n are known we can calculate the percentage of a pure radioactive sample left after undergoing decay since the fraction remaining = (1/2)ⁿ .

N_electrons = 2 n² , where N_electrons designates the number of electrons in shell n .

The state of each electron is determined by the four quantum numbers:

principal quantum number n determines the number of shells, possible values are: 1 (K), 2 (L), 3 (M), etc...
angular momentum quantum number l, determines the subshell, possible values are: 0 (s), 1 (p), 2 (d), 3 (f), n-1, etc...
magnetic momentum quantum number m_l , possible values are: ± l , ... , 0
spin quantum number m_s ,determines the direction of rotation of the electron, possible values are: ±1/2.

The Basics

Right Triangles

sin θ = opp/hyp	cos θ = adj/hyp	tan θ =opp/adj
θ = sin ^-1 x	arcsec θ = sec^-1θ	r² = x² + y²

angle θ may be given in radians (R) where 1 revolution = 2π^R = 360°
estimate square root 3 as 1.7 and root 2 as 1.4
cross-sectional area of a tube = area of a circle = πr² where π can be estimated as 3.14 and r is the radius of the circle; circumference = 2πr

Some Units to Memorize

Both work and energy are measured in joules where 1 joule (J) = 1 N × 1 m . {Imperial units: the foot- pound , CGS units: the dyne-centimeter or erg }
The SI unit for power is the watt (W) which equals one joule per second (J/s) = volts × amperes .
Current is measured in amperes = coulombs/sec. The units of resistance are ohms, symbolized by Ω (omega), where 1 ohm = 1 volt/ampere.
The SI unit for pressure is the pascal (1 Pa = 1 N/m² ). Other units are: 1.00 atm = 1.01 × 10⁵ Pa = 1.01 bar = 760 mmHg = 760 torr.
The SI unit for the magnetic induction vector B is the tesla where 1 T = 1 N/(A)(m) = 10⁴ gauss.

Wednesday, September 26, 2012

Main Physics Formulas and Constants | TutorState.com

Physics Formulas | TutorState.com

Physics Formulas in Reference Tables of Various Testes and Exams

NYC Regent Exam

Reference Tables for Physical Setting/PHYSICS, 2006 Edition

AP Exam

Table of Information and Equation Tables for AP Physics Exams

Main Physics Formulas end Constants

Saturday, September 15, 2012

In-Home Tutoring in New York City

Tutoring Services in Math, Physics, Chemistry, Computer Science, Statistics: TutorState.com

One-on-one and in small groups (3-5 students).

Locations of Small-Group Tutoring Centers:

Brooklyn (16th Ave & 76th St, Brooklyn, NY)
Staten Island

The first small-group tutoring lesson is free.

To apply for small-group private tutor call:

Mathematics: 917-318-2427
Physics and Earth Science: 718-223-0228
Chemistry, Biology, and Environment Science: 646-338-5121

Monday, September 10, 2012

Bad Tutors Waste Your Child's Time and Money

Tips from the Olympia Education Center on finding the right tutor to help your child.

The school year is back in full swing, and whether your child is preparing for the SAT or just needs a hand with math or science, a tutoring service can be a valuable tool. To make sure you get the most out of your money, Olympia Education Center has some tips for finding the right service for your child’s needs.
Nationally, Olympia Education Center received close to 300 complaints against tutoring services in the last 12 months. Most allege parents were dissatisfied with the services offered. They felt their children did not improve with the tutoring program. Other consumers alleged tutoring services continued to bill them after they ended the program.

There are many different types of tutoring services available:
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Also remember that qualifying families with limited income can receive free tutoring sessions.

If you’re looking for a tutor, Olympia Education Center recommends you follow these simple steps:

Do your research. For information on tutoring services or commercial learning centers, view the company’s complaint history, rating and more on its Olympia Education Center Business Review.
Get referrals. Ask for referrals from your child’s teacher. Other parents and friends can be a great resource as well.
Look for credentials. Check the tutor’s credentials and make sure he or she is qualified in the right subject area for your child’s needs.
Schedule a meeting. Meet with the tutor and discuss measurable, specific goals. While a tutoring program can’t necessarily guarantee higher test scores, a tutor can help identify problem areas and address any specific subjects where your child needs help.
Play a role. If you use a personal tutor, feel free to occasionally sit in on a session and observe how the tutor and your child are working together. Ask the tutor for advice on what you can do as a parent to help your child learn more effectively.
Read the terms and conditions. While you might not have to sign a contract, be sure you understand details about your payment plan. Make sure you understand whether your credit card will be automatically charged each week/month, and what happens if you decide to stop going. Also, be sure to ask and understand what happens if your child is unhappy or you’re not seeing the results you expected. Do you receive a refund/credit? Get everything in writing.
Check with U.S. Department of Education. Some families may qualify for low cost or free tutoring.

To check the reliability of a company and find trustworthy businesses, visit Olympia Education Center.

About Olympia Education Center: Olympia Education Center's mission is to be the leader in advancing marketplace trust. Olympia Education Center accomplishes this mission by creating a community of trustworthy businesses, setting standards for marketplace trust, encouraging and supporting best practices, celebrating marketplace role models and denouncing substandard marketplace behavior.

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