Physics

Question 1

x = 1/2 (vi + vf )t

Answer 1

Δx - displacement
t - time
vi - initial velocity
vf - final velocity

Question 2

vf = vi + at

Answer 2

a - acceleration
t - time
vi - initial velocity
vf - final velocity

Question 3

Δx = vi t + 1/2 at^2

Answer 3

a - acceleration
Δx - displacement
t - time
vi - initial velocity

Question 4

v final ^2 = v initial^2 + 2aΔx

Answer 4

a - acceleration
Δx - displacement
vi - initial velocity
vf - final velocity

Question 5

Newton’s 1st law

Answer 5

interia

objects at motion stay at motions unless acted on

Question 6

Newtons 2nd Law

Answer 6

F = ma

Question 7

Newtons 3rd Law

Answer 7

Equal and opposite reactions

FAB = - FBA

Question 8

Static Friction

Answer 8

Fmax = μs x N

Fmax - maximum static friction force
N - normal force
ųs - coefficient of static friction

Question 9

Kinetic Friction

Answer 9

Fkinetic = ųk x N

Fkinetic - kinetic friction force
N - normal force
ųk - coefficient of kinetic friction

Question 10

Gravitational formula

Answer 10

Fgrav = G m1m2/ r^2

F grav - gravitational force
G - universal gravitational constant
m - mass of first and second objects

Question 11

Centripetal acceleration

Answer 11

a = v^2/r

a - centripetal acceleration
v - velocity
r - distance of an object from the center of orbit

Question 12

Centripetal force

Answer 12

Fc = mv^2/r

Fc - centripetal force
m - mass of an object
v - velocity
r - distance of an object from the center of orbit

Question 13

Hookes Law

Answer 13

Fspring = -kx

Question 14

Troque

Answer 14

τ = F · d · sin(θ)

τ - torque
F - applied force
d - lever arm (distance from fulcrum)
θ - angle between applied force and lever arm

Question 15

Work

Answer 15

W = | F | · d · cos(θ)

W - work
F - applied force
d - displacement over which the force is applied
θ - angle between applied force and displacement

Question 16

Power

Answer 16

P = W/Δt

P - power
W - work or change in energy
Δt - time

Question 17

Kinetic Energy

Answer 17

1/2mv^2

Question 18

Potential Energy

Answer 18

mgh

Question 19

Elastic potential energy (spring)

Answer 19

1/2kx^2

Question 20

Conversation of energy

Answer 20

KE intial + PE intital = KE final + PE final

Question 21

Work-Energy theorem

Answer 21

W = ΔKE = KEfinal - KEinitial

Question 22

Work (Pressure-Volume curve)

Answer 22

W = PΔV

Question 23

First Law of Thermodynamics

Answer 23

Conservation of energy

ΔU = Q - W

ΔU - change in internal energy of the system
Q - heat entering the system
W - work done by the system

Question 24

Ideal Gas Law

Answer 24

PV = nRT

Question 25

Density

Answer 25

ρ = m/V ρ - density m - mass V - volume

Question 26

Specific gravity

Answer 26

ρ/ρwater

Question 27

Pressure

Answer 27

P = force/area

Question 28

Hydrostatic pressure

Answer 28

Psub = ρgh Sub = gauge pressure

Question 29

Absolute pressure

Answer 29

Pabs = Patm + ρgh

Question 30

Part of object submerged

Answer 30

ρobject/ ρliquid · 100

Question 31

Buoyant Force

Answer 31

Fbuoy = ρVg

Question 32

Pascals Law - pressure

Answer 32

P= F1/A1= F2/A2 F=force A=area

Question 33

Pascals Law = work

Answer 33

W = F1d1= F2d2 W - work F - Force d - displacement

Question 34

Coulombs Law

Answer 34

F = kq1q2/r^2 F - electrostatic force k - Coulomb’s constant q - charge of a particle r - distance between charges

Question 35

Ohms Law

Answer 35

V = IR V - voltage I - current R - resistance

Question 36

Current in series

Answer 36

Itotal = I1 = I2 = ... = In

Question 37

Voltage in series

Answer 37

Vsource = V1 + V2 + ... + Vn

Question 38

Resistance in series

Answer 38

Rtotal = R1 + R2 + ... + Rn

Question 39

Current in parallel

Answer 39

Itotal = I1 + I2 + ... + In

Question 40

Voltage in parallel

Answer 40

Vtotal = V1 = V2 = ... = Vn

Question 41

Resistance in parallel

Answer 41

1/Rtotal = 1/R1+ 1/R2 + ... + 1/Rn

Question 42

Capacitance

Answer 42

C = Q/V C - capacitance Q - charge stored in capacitor V - voltage across capacitor

Question 43

Velocity of a wave

Answer 43

v = wavelength x frequency

Question 44

Doppler effect

Answer 44

f΄= f0(vsound+ vobserver /(vsound + vsource)

Question 45

Standing wave for a string or pipe open at both ends

Answer 45

wavelength = 2L/n

Question 46

Standing wave for a pipe closed at one end

Answer 46

wavelength = 4L/n(odd)

Question 47

Rydberg Equation

Answer 47

1/λ = R ( 1/n1^2 - 1/n2^2) R - the Rydberg constant n - orbital levels λ - wavelength of photon

Question 48

Half life

Answer 48

t1/2 = 0.693/decay constant