QUESTION 1

1. Levers have only one class.
   

   		True
   		False

2 points

QUESTION 2

1. A lever is a bar that can pivot on a fixed point.
   

   		True
   		False

2 points

QUESTION 3

1. A see-saw is an example of a first class lever.
   

   		True
   		False

2 points

QUESTION 4

1. If the resistance force is 40 Newtons and the effort force is 20 Newtons, what is the mechanical advantage?
   

   		1
   		2
   		3
   		4

3 points

QUESTION 5

1. What do you need to calculate the mechanical advantage of a block and tackle?
   

   		resistance force
   		effort force
   		number of rope segments that support the resistance weight
   		number of pulleys in the block and tackle system

3 points

QUESTION 6

1. A playground slide is an example of which simple machine?
   

   		screw
   		inclined plane
   		pulley
   		wheel and axle

3 points

QUESTION 7

1. Which of the following is an example of a wheel and axle?
   

   		pencil sharpener
   		block and tackle system
   		knife
   		lid on a jar

3 points

QUESTION 8

1. The lid on a jar is an example of which simple machine?
   

   		screw
   		lever
   		pulley
   		wheel and axle

3 points

QUESTION 9

1. When movers use ramps to move heavy objects, which of the following are they doing in order to make work easier?
   

   		They are increasing the force needed.
   		They are increasing the amount of work done.
   		They are decreasing the amount of work done.
   		They are increasing the distance.

3 points

QUESTION 10

1. When you decrease the length of the effort arm on a lever which of the following happens to effort force?
   

   		Force will decrease
   		Force will increase
   		Force will vary
   		Force will remain the same.

3 points

Click Save and Submit to save and submit. Click Save All Answers to save all answers.

QUESTION 1

1. Which subatomic particle has a positive charge?
   

   		all of them
   		neutron
   		electron
   		proton

3 points

QUESTION 2

1. If an atom has 3 protons, 3 neutrons, and 2 electrons, what is the electrical charge of the atom?
   

   		positive
   		negative
   		neutral
   		varies

3 points

QUESTION 3

1. What happens when you shuffle across a carpeted floor?
   

   		You transfer electrons from your body to the floor and become positively charged.
   		You transfer electrons from you body to the floor and become negatively charged.
   		You pick up electrons from the floor and become positively charged.
   		The floor creates electrons from the movement and you become positively charged.

3 points

QUESTION 4

1. Which of the following describes the charge of an atom before any electrons are transferred?
   

   		positive charge
   		negative charge
   		it depends on the number of protons and neutrons
   		neutral charge

3 points

QUESTION 5

1. Which law has a mathematical relationship that is dependent upon the charges of the particles involved and the distance between those charges?
   

   		Faraday’s Law
   		Ohm’s Law
   		Interaction Law
   		Coulomb’s Law

3 points

QUESTION 6

1. Which of the following is a material that does not allow electrons to move easily through it?
   

   		electrical charge
   		static electricity
   		conductor
   		insulator

3 points

QUESTION 7

1. Which of the following is a good insulator?
   

   		wire
   		doorknob
   		plastic
   		nickel

3 points

QUESTION 8

1. Lightning rods are used on houses because they allow the lightening to go to the ground instead of into the house. This means that lightning rods are ________________.
   

   		poor conductors
   		good insulators
   		good conductors
   		neither insulators or conductors

3 points

QUESTION 9

1. Which of the following is the way that static electricity is transferred?
   

   		radiation
   		current
   		releasing charge
   		by contact

3 points

QUESTION 10

1. Wire is used to attach a battery to a penny and is then used to light a small light bulb. The light bulb is lit due to which of the following?
   

   		static electricity
   		electric current
   		electron overflow
   		moving protons

3 points

Click Save and Submit to save and submit. Click Save All Answers to save all answers.

QUESTION 1

1. Use the diagram to answer the following question.To determine the frequency of the wave, take _______________ and determine how many times it repeats over a certain amount of time.
   
   

   		Point B
   		Point C
   		Point D
   		Point E

3 points

QUESTION 2

1. Use the diagram to answer the following question.How can you calculate the amplitude of the wave in the diagram?
   
   

   		take ½ the difference between Points A and B
   		take ½ the difference between Points B and C
   		take 2 times the difference between Points B and C
   		take ½ the distance represented by Point E

3 points

QUESTION 3

1. The distance between crests on a wave is the
   

   		wavelength
   		amplitude
   		frequency
   		period

3 points

QUESTION 4

1. The energy of a wave is calculated by squaring the frequency of the wave.
   

   		True
   		False

2 points

QUESTION 5

1. To calculate the wave speed of a wave, square the amplitude of the wave.
   

   		True
   		False

2 points

QUESTION 6

1. What is the period of vibration for a wave with a frequency of 50 hertz?
   

   		50 seconds
   		500 seconds
   		2 seconds
   		0.02 seconds

3 points

QUESTION 7

1. If a wave has amplitude of 2 meters, a wavelength of 2 meters, and a frequency of 10 Hz, and a period of 1 second, then at what speed is the wave moving?
   

   		40 m/s
   		20 m/s
   		10 m/s
   		5 m/s

3 points

QUESTION 8

1. _______________ waves move perpendicular to their energy transport, while ____________ waves move parallel to their energy transport.
   

   		Longitudinal, transverse
   		Transverse, longitudina
   		Electromagnetic, longitudinal
   		Transverse, mechanical

3 points

QUESTION 9

1. In which type of wave does the medium move parallel to the direction of the energy transport?
   

   		secondary wave
   		longitudinal wave
   		surface wave
   		transverse wave

3 points

QUESTION 10

1. A sound wave is an example of an electromagnetic wave in nature.
   

   		True
   		False

2 points

Click Save and Submit to save and submit. Click Save All Answers to save all answers.

QUESTION 1

1. Which of the following is an example of a physical change to matter?
   

   		rusting
   		digestion
   		freezing

3 points

QUESTION 2

1. In which of the following does a chemical change take place?
   

   		mixing flour, salt, and sugar
   		baking a cake
   		adding ice to water

3 points

QUESTION 3

1. When a physical change occurs, one or more substances (reactants) break down or combine to form new substances (products).
   

   		True
   		False

2 points

QUESTION 4

1. Photosynthesis is a chemical reaction that involves the production of glucose (sugar) from carbon dioxide and water in the presence of sunlight. Photosynthesis is what kind of reaction?
   

   		exothermic
   		endothermic
   		decomposition

3 points

QUESTION 5

1. When you add calcium chloride to water in a Ziploc baggie, the baggie gets hot and explodes; this means that the reaction is exothermic.
   

   		True
   		False

2 points

QUESTION 6

1. The equation NaCl →Na +Cl is a ______ reaction.
   

   		decomposition
   		single displacement
   		synthesis

3 points

QUESTION 7

1. In a ________ reaction, a single uncombined element replaces another element in a compound.
   

   		synthesis
   		double displacement
   		single displacement

3 points

QUESTION 8

1. Barium replaces calcium in the following reaction: Ba + CaCO₃ → BaCO₃ +Ca. What type of reaction does this represent?
   

   		synthesis
   		single displacement
   		double displacement
   		decomposition

3 points

QUESTION 9

1. The following reaction is a single displacement reaction: CuO + H₂ → Cu + H₂O.
   

   		True
   		False

2 points

QUESTION 10

1. The following reaction is a single displacement reaction: Fe + O₂ → FeO₂.
   

   		True
   		False

2 points

Click Save and Submit to save and submit. Click Save All Answers to save all answers.

QUESTION 1

1. Newton’s work on gravity supported the heliocentric view of the universe.
   

   		True
   		False

2 points

QUESTION 2

1. It wasn’t until the 16th century that people believed that the planets revolved around the sun in a solar system.
   

   		True
   		False

2 points

QUESTION 3

1. How do we know that dark matter exists?
   

   		Dark matter exerts a gravitational force on light and bends it.
   		We can see dark matter, because it emits and absorbs light.
   		Dark matter is made of baryonic material, like atoms.

3 points

QUESTION 4

1. How much of the universe is believed to consist of ordinary atoms that can be detected?
   

   		75%
   		20%
   		3%

3 points

QUESTION 5

1. According to the Big Bang Theory, we believe that the universe is _______.
   

   		no longer expanding
   		still expanding
   		expanding in one direction but contracting in other directions

3 points

QUESTION 6

1. The Big Bang Theory is supported by evidence that space is expanding between galaxies and by radiation that is coming from all directions.
   

   		True
   		False

2 points

QUESTION 7

1.  

   Do you need a similar assignment done for you from scratch? We have qualified writers to help you. We assure you an A+ quality paper that is free from plagiarism. Order now for an Amazing Discount!
   Use Discount Code "Newclient" for a 15% Discount!
   
   NB: We do not resell papers. Upon ordering, we do an original paper exclusively for you.