PHYSICS LAB (FINALS) Reviewer

1

Egr

EXPERIMENT 5: Resonance & Speed of Sound Sound - wave created by vibrating object travelling through a medium (mechanical wave) from one location to another (longitudinal wave).

sinusoidal wave

Open Tube Closed Tube L

L

Speed of Sound

; *frequency (f) =

therefore: Speed (experimental closed tube) = Speed (standard) at 0

0C, speed of sound is 331 m/s

For every increase by 10C, speed increases by 0.6

m/s example: speed at 25.3

0C

331 + 25.3(0.6) = 346.2 m/s *hz = vib/sec *frequency and are inversely proportional. ( as frequency increases

EXPERIMENT 6: Resistors in Series and Parallel Resistor- an electrical component that limits or regulates the flow of electrical current in an electrical current - measured in ohms (Ω) Examples:

1. R1: Y - V - R- S Color code value: 47 x 102 10 % Tolerance: 4230 - 5170 Ω

2. R2: Grey - O - Green - Gold Color code value: 83 x 105 5% Tolerance: 7 885 000 - 8 715 000 Ω

3. Grey - W- S - None Color code value: 59 x 10-2 Tolerance: 0.472 - 0.708 Ω

4. R4: W-Black - Black - R Color code value: 90 x 100 2%

Tolerance: 88.2 - 91.8 Ω R1 = 4700 ; R2= 8 300 000; R3 = 0.59

Series: R1 R2 R3

Rtotal = ; Rtotal > largest amount

Rtotal = R1 + R2 + R3 = 8 304 700.59 Ω

Parallel

=

; Rtotal < Smallest amount

EXPERIMENT 7: Specific Heat of Metals Heat - flow of energy from hot to cold substance amount of heat (Q) conducted from B to A is dependent on the temperature change of the substances

where: (change in temp)

unit for

Heat Capacity Specific Heat Capacity

A

B *hot to cold

PHYSICS LAB (FINALS) Reviewer

2

Egr

Specific Heat Capacity -amount of heat needed to raise the temperature of a unit mass of substance by one Celsius degree Standard Specific Heat of some substances CH20 = 1 cal/gC0 Ccopper= 0.093 cal/gC0 Csteel = 0.11 cal/g C0

Caluminum= 0.215 cal/gC0

Thermal Equilibrium -objects in contact will transder heat until their temp are the same Conservation of Heat and Energy Heat Absorbed + Heat Released = 0 -in an isolated system, the amount of heat absorbed is equal to the amount of heat released. EXPERIMENT 8: Latent Heat of Fusion Latent Heat - change phase w/o changing temp Conservation of Heat: Isolation of system Qwater + Qcalorimeter + Qice = 0

Lf =

Effects of Heat Transfer -sensible effect, latent effect, expansion latent effect -latent heat is the amt of heat needed to change phase without a change in temp. it only happens at critical temperatures (boiling & melting point) Latent Heat of Fusion (Lf) -amount of heat needed to change from solid to liquid (melting point) Latent Heat of Vaporization (Lv) -amount of heat needed to change the phase of a substance from liquid to gas (boiling pt)

Standard Latent Heat of water Lf = 80 cal/g Lv= 540 cal/g