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Which of the following sets of two charges is experiencing the strongest attraction? Charges of +2 C and -2 C, separated by 1 m. Charges of +1 C and -3 C, separated by 1 m. Charges of +2 C and +2 C, separated by 1 m. Charges of +1 C and +3 C, separated by
A sound has a higher pitch than a bell. Which quantity must also be higher in this sound than in the bell?(1 point) Responses speed speed wavelength wavelength frequency frequency amplitude
Where do the forces that make atoms interact come from?(1 point) Responses from the electric fields of neutral molecules from the electric fields of neutral subatomic particles from the electric fields of charged subatomic particles from the electric
Where do the forces that make atoms interact come from?(1 point) Responses from the electric fields of neutral molecules from the electric fields of neutral molecules from the electric fields of neutral subatomic particles from the electric fields of
Which sentence best describes a self-directed learner?(1 point) Responses She always gets good grades. She always gets good grades. She rushes through a project very quickly. She rushes through a project very quickly. She makes sure to complete all class
Which sentence best describes how a self-directed learner might investigate gravity?(1 point) Responses She would only follow her teacher’s instructions for testing the effects of gravity. She would only follow her teacher’s instructions for testing
A mechanic wants to use a compound pulley to lift a go-kart from the ground to work table, a distance of 1.2 meters. Without the pulley, 1,620 Newtons of force would be needed to lift the go-kart. If the pulley has a mechanical advantage of 4, how much
A gardener uses a wheelbarrow to move 20 kilograms of soil from a compost pile to a flower bed, a distance of 53 meters. The wheelbarrow has a mass of 17 kilograms. He expends 94.5 Newtons of force. How much work does the gardener do?(1 point) Responses
A graphic designer has the choice to download design software on her computer and then design a logo or to use an online version of the software to design the logo. Identify one advantage and one disadvantage of using the online software to design the logo
Sound travels through a guitar string at 600 m/s, making a sound wave in the air with a speed of 333 m/s. In 1–2 sentences, explain how the wavelength and frequency of the wave in the string compare to the wavelength and frequency of the wave in the
In one to two sentences, describe the relationship between harmonics and resonance frequency in a piano.(2 points)
In one or two sentences, make and justify a claim about two aspects of the picture that illustrate behaviors of light.
Which phrase correctly defines the amplitude of a wave?(1 point) Responses the vertical distance from the trough of a wave to the crest the vertical distance from the trough of a wave to the crest the horizontal distance from the trough of one wave to the
A stationary source produces a sound wave at a frequency of 100 Hz. The wave travels at 1125 feet per second. A car is moving toward the sound source at a speed of 200 feet per second. What is the wavelength of the stationary sound source and the
How do the frequencies and the speeds of yellow light and blue light compare?(1 point) Responses The frequency of blue light is greater than that of yellow light, while the speed of yellow light is faster than that of blue light. The frequency of blue
What is one way that light waves differ from sound waves?(1 point) Responses Light waves do not require a medium to propagate. Light waves do not require a medium to propagate. Light waves travel by oscillation. Light waves travel by oscillation. Light
Which statement best describes the refraction of light as it moves from air to glass?(1 point) Responses Light bends due to the difference in the speed of light in air and glass. Light bends due to the difference in the speed of light in air and glass.
Sally puts on wool socks and rubs her feet on a nylon carpet. How does static electricity build up in Sally? Responses Electrons from the wool socks move into the carpet, giving Sally and her socks a positive charge. Electrons from the wool socks move into
A group of students sets up an electric circuit with wires, a battery, and a light bulb. Why is their circuit called a direct circuit? Responses The circuit is complete, so electrons can flow freely. The circuit is complete, so electrons can flow freely.
In 1–2 sentences, explain how electromagnets move a maglev train.
In 1–2 sentences, explain how to make an electromagnet.
A team of students builds an electrical circuit with a battery and a fan. In 1–2 sentences, describe how energy is changed from one form to another in their electric circuit.
In 1–2 sentences, describe the factors that affect the current (amperage) in an electric circuit.
In 1–2 sentences, describe a setup of pith balls that have negative charges and are hanging from the same point.(2 points)
What is the function of the core of an electromagnet?(1 point) Responses The core provides the magnet with electric energy. The core provides the magnet with electric energy. The core provides the conductor through which electric current flows. The core
Hal makes an electromagnet with a 9-volt battery, wire, and a steel rod. What is the function of electric current in his electromagnet? (1 point) Responses Electric current determines the strength of the magnet. Electric current determines the strength of
Which of the following best describes an electric circuit that powers a load?(1 point) Responses Electric current flows from an energy source through a conductor and back to the energy source. Electric current flows from an energy source through a
Which is an example of a load in an electric circuit?(1 point) Responses 9-volt battery 9-volt battery on-off lever on-off lever speaker speaker wiring
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