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24.1
The Electromagnetic Spectrum
Radio waves, microwaves, visible light, and xrays are familiar kinds of electromagnetic waves. All of these
waves have characteristic wavelengths and frequencies. Wavelength is measured in meter
. . Attics
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Refractlon 23.2
@ 31.! id. This bending is called refraction. Refraction is 3
Speed OP lialn'l cfw_n wa+&r :_ 3Xl0 5 nera lenses to binoculars depend on refraction.
lo33
27 memos"9
_g,_._1, the sh appears
Ohms Law Calculations
V=IR
R=
V
I
I=
V
R
1. A hair dryer uses a wire that is hot because of the current in it to warm the air that blows through the
dryer. The resistance of this wire is 7.7 . If the current through the wire equals 15.6 A, what is the
vol
Temperature Conversions
TK=TC+273 TC=TK273 Tp= 1.8TC+32 TC:
1 The highest surface temperature on any of the solar systems planets is found on Venus. Partly because
of its nearness to the sun and partly because of the extreme pressure of its atmosphere, th
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Refraction 232
When light rays cross from one material to another they bend. This bending is called refraction. Refraction is a
useful phenomenon. All kinds of optics, from glasses to camera lenses to binoculars depend on r
H=mcT
Specific Heat Worksheet
H
m=
=
cT
=
1. If 200 grams of water is to be heated from 24.0C to 100.0C to make a cup of tea, how much heat must
be added? The specific heat of water is 4.18 J/gC.
2. 100.0 g of 4.0C water is heated until its temperature i
=
1
=
1
WAVE CALCULATIONS
=
=
=
Solve the following problems.
shown?
?
2. A wave has a period of 2 seconds. What is its frequency?
3. A tuning fork has a frequency of 280 hertz, and the wavelength of the sound produced is 1.5 m.
Calculate the velocity o
Lens Equation Worksheet
object height
di image distance
image height
Object distance
do
f is the focal length of the lens
=
+
=
=
Magnification=
di
do
also
M= hhoi
1. An object is placed 32 cm from a converging (convex) lens that has a focal length o
Potential and Kinetic Energy Calculations J
E E 1 ZEk 25K
= m h = _p h = _;p E = 2 =  = 
E", g m gh mg K 2 mm v m m 1:2
Potential Energy Problems
1. What is the potential energy of a 2 kg potted plant that is on a 1 m high plant stand?
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E? : remain
1) Amy uses 20N of force to push a lawn mower 10 meters. How much work does she do?
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Work Calculations
2) How much work does an elephant do while moving a circus wagon 20 meters with a pulling
force of 200M?
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6.
P:W
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Power Calculations
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90$,
. A motor does 5000 Joules of work in 20 seconds. What is the power of the motor?
A machine does 1500 J of work in 30 seconds. What is the power of this machine?
P:
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303
\il, boos : 50 Want);
A ha
=
Power Calculations
=
=
=
1. A motor does 5000 Joules of work in 20 seconds. What is the power of the motor?
2. A machine does 1500 J of work in 30 seconds. What is the power of this machine?
3. A hair dryer uses 72,000 J of work in 60 seconds .What is
Net Force and Freebody Diagrams
1. Bob pushes on a crate with a force of 450 N. If the force of friction on the crate is 150 N, what
is the net force on the crate?
2. You and your brother are pushing a car with a dead battery with forces of 20 N and 25 N
Falling Objects
= +
1
= 2
2
=
2
Distance Fallen
1. A small firstaid kit is dropped by a rock climber. After 2.5s how far has the firstaid kit fallen?
2. A fish is dropped by a pelican. After 2.8s how far has the fish fallen?
3. A small pebble falls o
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Useful conversion factors and equations
1 mile = 5280 ft
1.609 km = 1mile
2.54 cm = 1 inch
Density =
m
1 quart = 946.4 mL
V
1) How many mL are in 0.50 quarts?
2) How many mL are in 0.258 L?
3) How many kL are in 8383 L?
4) How many cm are in 0.783
Name _
Acceleration Calculations
=
=
+
1. Calculate the acceleration of a car (in km/hr/s) that can go from rest to 100 km/hr in 10s.
2. A sprinter starting from rest on a straight, level track is able to achieve a speed of 12 m/s in
6.0s. What is th
=
Momentum Calculations
=
=
1. A tractortrailer truck is traveling down the freeway at 35 m/s. If the mass of the truck is 2000
kg, what is its momentum?
2. If a sports car with a mass of 1000 kg is also traveling down the freeway at 35 m/s, what is it
d
v=
t
Speed Calculations
d=tv
t=
d
v
1. An Olympic athlete runs 200.0 m in 21.34 s. What is her average speed?
2. A cheetah runs 274 m in 8.65 s. What is its average speed?
3. If a swimmer is able to swim 50.0 m in 55.2 s, what is his average speed?
4. W
Newtons Second Law
=
=
=
=
1. How much force is needed to accelerate a truck with a mass of 2000 kg at a rate of 3 m/s 2?
= = ( ) (
) =
2
2. How much force is needed to accelerate a 68 kg skier at a rate of 1.2 m/s ?
= = ( ) (.
) = .
3. What is t
Activity 02:
Table 1: Spring 1
Mass (g)
50g
100g
250g

Change the length (cm)
15 cm
23 cm
43 cm

Spring constant (N/m)
3.062
4.260
5.70
4.341
Table 2: Spring 3
Mass (g)
50g
100g
250g

Change the length (cm)
20 cm
33 cm
77 cm

Spring constant (N/m)
2
3
Activity 02
Voltage of battery
(V)
10
20
30
40
50
60
70
6
5
4
3
2
1
0
Voltage across the
resistor (V)
7.692
15.383
23.075
30.767
38.458
46.15
53.842
Current in the
resistor (Amp)
0.77
1.54
2.31
3.08
3.85
4.61
5.38
Power consumed by
the resistor(W)
5.92
23
Objectives:
Understanding the properties of the projectile motion
Calculating the acceleration due gravity by measuring the range of the projectile
Activity 02:
Angle
Range
(m)
Times
(s)
Maximum
Height
15
Launc
h
25
speed
(m/s)
35
24.2
1.3
1.3
Maximu
y c