At what point does the object have the most potential energy?
1 point
1
Question 2
2.
As Bob jumps off the couch, his potential energy equals 50 J. What is his kinetic energy if his total mechanical energy is still 150 J?
1 point
1
Question 3
3.
If the power rating of a incandescent light bulb is 60 Watts, then how much time does it take the light bulb to run to acheive 120 J of work?
2 points
2
Question 4
4.
Someone wearing skates on a horizontal surface is pushed by a friend with a force of 65 N. How far must the student be pushed in 30 seconds, so that her power is 352 W?
1 point
1
Question 5
5.
If it took the quarterback in the last problem 0.2 [s] to throw the football, what is the quarterback's power rating?
1 point
1
Question 6
6.
In which of the following is potential energy being transformed into kinetic energy?
1 point
1
Question 7
7.
Consider an object falling from a height of 300 m. If we ignore air resistance, its total mechanical energy:
Section 2 - Electricity and Circuits
1 point
1
Question 8
8.
Which of the following is a subatomic particle with a negative charge which is found on the outside of an atom?
1 point
1
Question 9
9.
Unlike charges will repel one another.
1 point
1
Question 10
10.
Which of the following options is the best conductor of an electrical current?
6 points
6
Question 11
11.
Match the circuit diagram to the element it represents
Draggable item
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Corresponding Item
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Battery
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Light Bulb
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Switch
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Resistor
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Voltmeter
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Ammeter
1 point
1
Question 12
12.
Which of the following descriptions best describes the circuit in the picture?
1 point
1
Question 13
13.
Which of the following descriptions best describes the circuit in the picture?
3 points
3
Question 14
14.
Match the unit of measurement to the quantity it measures.
Draggable item
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Corresponding Item
Amperes, [A]
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Resistance to charge flow.
Volts, [V]
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Electrical current
Ohm, [Ω]
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Voltage
1 point
1
Question 15
15.
Study the circuit above and answer the following question.
If an ammeter were placed in the same branch of the circuit as the bulb labelled #3, what current would it read?
1 point
1
Question 16
16.
Study the circuit above and answer the following question.
If an ammeter were placed after the junction after the bulb labelled #2, what current would it read?
1 point
1
Question 17
17.
What is the voltage across an electrical load which has a resistance of 39 Ohms and which has a current of 3 Amperes flowing through it?
1 point
1
Question 18
18.
A smartphone is connected to an external 24 Volt power supply. Calculate the current that the phone draws if it has a resistance of 8 Ohms.
1 point
1
Question 19
19.
A blender is connected to a 120 Volt power supply, and draws a current of 11.5 Amperes. What is the blender's resistance?
Section 3 - Magnets and Electromagnetism
Required
1 point
1
Question 20
20.
If a magnet with two poles is cut in half, it will have only one pole
Required
1 point
1
Question 21
21.
All metals are magnetic.
Required
1 point
1
Question 22
22.
Similar poles of a magnet repel each other.
Required
1 point
1
Question 23
23.
A magnetic force cannot act on an electron when it moves...
Required
1 point
1
Question 24
24.
The north-seeking arrow of a compass points to the magnetic north pole.
Section 4 - Waves
1 point
1
Question 25
25.
What is the lowest point of a wave called?
1 point
1
Question 26
26.
The regions of a wave where the particles are the CLOSEST together in a longitudinal wave are called
1 point
1
Question 27
27.
The measurement from crest to crest or from trough to trough is called what?
1 point
1
Question 28
28.
What is the unit for frequency?
Use the diagram of a wave below to answer questions 29-30. Assume each box is equal to 1 meter.
1 point
1
Question 29
29.
What is the wavelength (in m) of the wave above if each box is 1 meter long?
1 point
1
Question 30
30.
What is the amplitude (in m) of the wave above?
1 point
1
Question 31
31.
What is the frequency for a wave that has a velocity of 20 m/s and a wavelngth of 4 m?
1 point
1
Question 32
32.
Longitudinal waves ...
1 point
1
Question 33
33.
Refraction is . . .
1 point
1
Question 34
34.
The law of reflection states that . . .
Section 5: Space
Required
2 points
2
Question 35
35.
Order these astronomy vocabulary from the largest object to the smallest:
universe
solar system
planet
galaxy
Required
1 point
1
Question 36
36.
As far as we know, there is only one of these. We've only been able to observe approximately 4% of its entire volume.
1 point
1
Question 37
37.
A light year is the distance that light can travel in a year.
Required
1 point
1
Question 38
38.
Which galaxy do we live in?
Required
1 point
1
Question 39
39.
Compared to the earth's solar system, the universe is:
Required
2 points
2
Question 40
40.
As the star approaches the observer, the star appears __________. This phenomenon is called a __________ star.