Exam Review
A 16 N force is applied to an object and 96 J of work is done. How far was the object moved?
6 meters
The light bulb in the image is a 100-Watt bulb that draws 2 Amps of current in a standard 120-Volt household circuit. Determine the resistance of the light bulb.
60 ohms
Calculate the power provided by a 240 volt, 30 ampere common household dryer.
7200 W
A 62 kg box is lifted 12 meters off the ground. How much work was done?
7291.2 j
Derek reads at rate of 25 words per min. How long would it take him to read a 225 word article if he read at a constant rate without stopping?
9 minutes
A 24-V battery is powering a light bulb with a resistance of 2.5 ohms. What is the current flowing through the bulb?
9.6 A
When Jamie removes a woolen cap, his hair develops an excess of static charge Which of these BEST explains this phenomenon?
Electrons are transferred from Jamie's hair to the woolen cap.
Because of friction
all of an objects kinetic energy turns into potential energy
Three light bulbs are connected to a battery in a series circuit. How will the bulbs behave if the circuit is closed?
all three bulbs will glow
An advantage of parallel circuits is that they
allow current to flow even if some paths are cut.
One disadvantage of this type of circuit is that
as more lights are added to the circuit, the voltage to each decreases.
A box slides from the top of a ramp to the bottom, its maximum potential energy is located
at the top.
in this circuit what part would be the energy source
battery
A book falls from a desk. Which graph BEST represents the book's change in potential energy?
c
When a balloon is rubbed with human hair, the balloon acquires an excess static charge. This implies that some materials
can give up electrons more readily than others.
On Halloween, you take a glow stick, crack the capsule inside and shake it until it glows. This is an example of light energy being created from ___________________ energy.
chemical
What is the energy transformation taking place, from the batteries to the flashlight when it is on?
chemical to electrical to light
Direct current, DC, flows in a _________ direction while alternating current, AC, the direction of flow ___________.
constant , periodically reverse
Which part of a circuit would represent a device that can easily turn the circuit on or off?
d
What is the current through the resistors in the circuit?
0.5 AMPS
How many batteries are found in this circuit diagram?
1
A resistance is added in parallel to a 470 Ω resistance to give an effective resistance of 330 Ω. What is the approximate value of the added resistance?
1.1 k
What is the velocity in meters per second of a runner who runs exactly 110 m toward the beach in 72 seconds.
1.5 m/s toward the beach
Calculate the power provided by a 120 volt microwave given it has a current of 8.6 amperes and a resistance of 14 ohms. (rounded to the nearest tens place)
1040 W
What is the voltage in a circuit if the current is 6.2 A and the resistance is 18 ohms?
111.6 v
If the battery on this circuit is a 12-volt battery, each light on this circuit gets
12 volts
How many switches are found in this circuit diagram?
2
shannon drove her car 140 miles east at a rate of 70 miles per hour. How long did she travel?
2 hours
A car travels 10 miles East in 30 minutes. What is its velocity in miles per hour?
20 miles per hour east
Marcus drove his Honda Prelude for 4 hours at a rate of 55 miles per hour. How far did he travel?
220 miles
The graph shows the acceleration of a racehorse taking off from a starting gate. By how much did the horse's speed increase between 4 seconds and 6 seconds?
27 m/s
How many resistors are found in this circuit?
3
A battery-operated DVD player uses 12 DC volts from AA batteries and draws a current of 3 A. Calculate the resistance.
4 ohms
Four balls are dropped from a platform, 20 meters high. Which ball will experience the GREATEST change in kinetic energy, from platform to ground?
40 kg
Calculate the amount of work done if you use a 100N force to push a 50kg box 5m across the kitchen floor.
500 j
Find the current passing through a circuit consisting of a battery and one resistor. The resistor has a resistance of 2 ohms and the battery has a voltage of 12 volts.
6 amps
Which is an example of electrical energy being converted into light energy?
A light bulb
Which ball travel at the fastest speed ? Ball Distance Traveled by Ball (cm) Time Taken (seconds) Ball 1 30 2.4 Ball 2 30 2.0 Ball 3 30 3.6 Ball 4 30 3.2
Ball 2
Which of these features are NOT seen in the circuit shown here?
CLOSED SWITCHES
Which electrical circuit is designed to produce light?
a flashlight
Which statement best summarizes the law of conservation of energy?
If energy disappears in one form, it must reappear in another.
Which statement is true?
In the US, the supply of AC mainly relies upon our natural resources.
Which is a source of AC current?
a generator
41) A series circuit contains four light bulbs. The switch is opened and one of the bulbs is removed, but not replaced. Then the switch is closed again. What would you expect to see?
None of the remaining light bulbs will be on.
Predict which item has the GREATEST DECREASE in kinetic energy. Assume both planes reach identical velocity.
Passenger airplane lands at an airport
When a student combed his dry hair for a long time, his hair began to stand up. Which of these has MOST LIKELY happened?
The comb and hair have become charged with opposite charges.
James and Juan were at the highest point in the football stadium, dropping water balloons on people below. Many of the balloons did not break, so the boys added more water to the balloons. What impact did adding water have on the balloons' potential energy?
The gravitational potential energy increased because the mass increased.
The above picture illustrates molecules in motion inside a closed cylinder. Which statement BEST describes what would happen if you were to increase the temperature inside the container.
The kinetic energy would increase.
A rock is pushed out of a six-story window that is 60 feet above the ground. What energy changes occur as the rock falls to the ground?
The potential energy of the rock is transformed into kinetic energy.
Which is an example of gaining a static charge by conduction?
Touching your car on a cold day and getting a shock.
which car is acceleration
a car that rounds a curve at a constant speed
Which object has the MOST kinetic energy?
a car traveling 25 km/h
Within the alarm clock seen here, energy is transformed. It is time to get up! The alarm clock goes off. What are the energy transformations taking place in your alarm clock?
electrical to mechanical to sound
When an object gains or loses electrons, it becomes
electricity charged
The electrical conductivity of a substance depends on the ability of the ____ in it to move.
electrons
The law of conservation of energy states that
energy may neither be created nor destroyed; it may only be transformed.
Maria's father started a fire in the fireplace. He crumpled some paper, lit a match, and soon the logs in the fireplace were burning. In this case, the stored chemical energy in the logs was changed into
heat and light energy
When gasoline is burned in a car engine, ________ energy is converted into _________ energy.
heat, chemical
An object that has kinetic energy must be
in motion
this can best be explained
inertia
A circuit contains three light bulbs in parallel. After observation, a fourth light bulb is added, also in parallel. How does the intensity of the four light bulb circuit compare with the intensity of the three light bulb circuit?
it has the same intensity
A softball is hit high into the air. As it rises, the softball
loses kinetic energy and gains potential energy.
A solar powered car converts _______________ energy into _________________ energy.
mechanical , light
The prefix kilo- means
one thousand
Consider the circuit if switches are added at points A, B, C, and D. All the switches are closed EXCEPT the switch at position D, which is left open. What is the result of this?
only light 4 will go
The multiple paths in this circuit suggest that it is MOST LIKELY a
parellel circuit
As a roller coaster goes downhill
potential energy is converted into kinetic energy.
The primary reason a light bulb emits light is due to
resistance
If Shane and Susan both push on a box with a force of 25N, but in opposite directions, what will happen to the box?
the box will not move
A major difference between AC and DC electricity is that
the current in AC electricity varies in magnitude and direction.
A series circuit includes a battery and a tiny fan. How will the circuit behave if closed?
the fan will blow
According to Newton's Third Law, what is the equal and opposite force to the downward force of gravity pulling on a man standing on the beach?
the man pulling upward on the earth
During physical science class, Ben and Jerry connected three identical light bulbs in parallel to a battery. What happens when Ben removes one of the light bulbs from its socket?
the other light bulbs remain on and will be equally bright
You are holding a full bowl of hot soup while standing in the kitchen. As you begin moving, some of the soup spills out of the bowl onto the floor. Upon reflection, you realize that
the soup wanted to stay where it was but you moved the bowl
According to the law of conservation of energy,
the total amount of energy for a system stays the same.
A strand of 10 lights is plugged into an outlet. How can you determine if the lights are connected in series or parallel?
unscrew one light. if the other lights turn off , its a series circuit
what part of a circuit conducts electricity
wire
