Questions and answers by

the real BARNY THE DINO :)

Questions (172)

Gardeners would need to use 960 Newtons of force to lift a potted tree 45 centimeters onto a deck. Instead, they set up a lever.
1. 1 answer
2. 258 views
What is the advantage of class 3 lever?(1 point)Responses It increases the mechanical advantage compared with other levers. It
1. 5 answers
2. 414 views
What is the advantage of class 3 lever?(1 point)Responses It increases the mechanical advantage compared with other levers. It
1. 1 answer
2. 240 views
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
1. 1 answer
2. 879 views
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
1. 1 answer
2. 452 views
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
1. 2 answers
2. 447 views
There are pros and cons to both e readers and paper books do you think the pros outweigh the cons more for modern electronic
1. 1 answer
2. 210 views
A surfer talks about riding a 20-foot wave. Which measurement of waves is the surfer describing?(1 point)Responses amplitude
1. 1 answer
2. 209 views
Which wave measure is changing by the greatest amount in the image?(1 point) Responses amplitude amplitude speed speed frequency
1. 1 answer
2. 256 views
Which term describes the distance from the crest of a wave to the next crest?(1 point)Responses speed speed amplitude amplitude
1. 1 answer
2. 282 views
Which characteristic is defined as the distance traveled by a wave crest in a given time?(1 point)Responses frequency frequency
1. 1 answer
2. 246 views
The wires in a piano vibrate, but fractions of the wire also vibrate at different frequencies than the whole wire. What is the
1. 1 answer
2. 174 views
What term is used to describe the combination of two traveling waves in the same material, which can be constructive or
1. 1 answer
2. 189 views
How can a person sing into a piano and cause a piano wire to vibrate?(1 point)Responses The person sings at the same frequency
1. 1 answer
2. 170 views
How can a person sing into a piano and cause a piano wire to vibrate?(1 point)Responses The person sings at the same frequency
1. 0 answers
2. 154 views
n which case will a beat frequency most likely occur?(1 point)Responses two of the same instrument playing notes at the same
1. 1 answer
2. 159 views
A piano tuner hears a beat frequency when using a tuning fork to tune a piano wire. The piano tuner should adjust the tension in
1. 1 answer
2. 198 views
A person is singing in the shower. They notice that as certain notes become very loud, the shower walls vibrate. Which statement
1. 2 answers
2. 219 views
When a guitar string is plucked, what part of the standing wave is found at the fixed ends of the string?(1 point)Responses the
1. 1 answer
2. 176 views
Sound Wave Phenomena Quick Check3 of 53 of 5 Items Question A stationary source produces a sound wave at a frequency of 100 Hz.
1. 1 answer
2. 503 views
Which image corresponds to what moment in time?(1 point) Responses The low-pitched sound corresponds to the sound source moving
1. 1 answer
2. 252 views
A person moves away from a stationary sound source. Which phrase describes the sound perceived by the person?(1 point)Responses
1. 1 answer
2. 336 views
A person moves away from a stationary sound source. Which phrase describes the sound perceived by the person?(1 point)Responses
1. 0 answers
2. 337 views
Wave Characteristics Quick Check5 of 55 of 5 Items Question Which of the following is true about sound waves? (1 point)
1. 3 answers
2. 423 views
What happens to the wavelength when the frequency increases?(1 point)Responses The wavelength decreases. The wavelength
1. 8 answers
2. 196 views
How does an increase in amplitude affect sound and light waves?(1 point)Responses louder sound and longer wavelengths for light
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2. 173 views
How does an increase in amplitude affect sound and light waves?(1 point)Responses louder sound and longer wavelengths for light
1. 0 answers
2. 259 views
What do both sound and light waves transfer?(1 point)Responses energy energy electricity electricity air air matter PLzzz give
1. 1 answer
2. 152 views
What do both sound and light waves transfer?(1 point)Responses energy energy electricity electricity air air matter
1. 1 answer
2. 135 views
Which type of wave needs a medium to travel?(1 point)Responses sound waves, because they travel by oscillating molecules sound
1. 1 answer
2. 247 views
Which statement correctly describes the refraction of light?(1 point)Responses As light waves enter a different medium, they
1. 1 answer
2. 218 views
Which statement correctly describes the refraction of light?(1 point)Responses As light waves enter a different medium, they
1. 0 answers
2. 197 views
Which statement explains why white objects appear white and black objects appear black?(1 point)Responses White objects absorb
1. 1 answer
2. 321 views
Parallel light waves bounce off a smooth surface. Which behavior of light does this describe?(1 point)Responses superposition
1. 1 answer
2. 223 views
Parallel light waves bounce off a smooth surface. Which behavior of light does this describe?(1 point)Responses superposition
1. 0 answers
2. 188 views
Which defines a concave mirror?(1 point)Responses A concave mirror curves inward with the edges of the mirror pointing away from
1. 1 answer
2. 175 views
Which of these best describes the relationship between the incident ray, the reflected ray, and the normal for a curved
1. 1 answer
2. 278 views
In 1–2 sentences, explain how electromagnets move a maglev train.
1. 3 answers
2. 612 views
In 1–2 sentences, explain how to make an electromagnet.
1. 1 answer
2. 477 views
A team of students builds an electrical circuit with a battery and a fan. In 1–2 sentences, describe how energy is changed
1. 3 answers
2. 694 views
In 1–2 sentences, describe the factors that affect the current (amperage) in an electric circuit.
1. 3 answers
2. 770 views
In 1 to 2 sentences describe a setup of pith balls that have negative charges and are hanging from the same point
1. 3 answers
2. 831 views
What is the function of the core of an electromagnet?(1 point)Responses The core provides the conductor through which electric
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2. 457 views
What is the function of the core of an electromagnet?(1 point)Responses The core provides the conductor through which electric
1. 1 answer
2. 262 views
What is the function of the core of an electromagnet?(1 point)Responses The core provides the conductor through which electric
1. 0 answers
2. 341 views
Hal makes an electromagnet with a 9-volt battery, wire, and a steel rod. What is the function of electric current in his
1. 1 answer
2. 285 views
Hal makes an electromagnet with a 9-volt battery, wire, and a steel rod. What is the function of electric current in his
1. 1 answer
2. 808 views
Which of the following best describes an electric circuit that powers a load?(1 point)Responses Electric current flows from an
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2. 732 views
Which of the following best describes an electric circuit that powers a load?(1 point)Responses Electric current flows from an
1. 0 answers
2. 310 views
Which is an example of a load in an electric circuit?(1 point)Responses wiring wiring on-off lever on-off lever 9-volt battery
1. 1 answer
2. 535 views
Which is an example of a load in an electric circuit?(1 point)Responses wiring wiring on-off lever on-off lever 9-volt battery
1. 0 answers
2. 349 views
How does a flashlight illustrate the Law of Conservation of Energy? (1 point)Responses Potential energy in the battery will be
1. 1 answer
2. 622 views
The resistance in a circuit is halved. What happens to the voltage?V=IR (1 point) Responses The voltage remains the same. The
1. 2 answers
2. 500 views
The resistance in a circuit is halved. What happens to the voltage?V=IR (1 point) Responses The voltage remains the same. The
1. 1 answer
2. 279 views
The resistance in a circuit is halved. What happens to the voltage?V=IR (1 point) Responses The voltage remains the same. The
1. 0 answers
2. 478 views
Sally puts on wool socks and rubs her feet on a nylon carpet. How does static electricity build up in Sally?(1 point)Responses
1. 1 answer
2. 1,325 views
A group of students sets up an electric circuit with wires, a battery, and a light bulb. Why is their circuit called a direct
1. 9 answers
2. 1,314 views
Which statement about electric charges is correct?(1 point)Responses Two objects with negative charges will attract each other.
1. 2 answers
2. 689 views
How does a maglev train move forward?(1 point)Responses Magnets in the sides of the tracks constantly repel and attract magnets
1. 4 answers
2. 462 views
How does a maglev train move forward?(1 point)Responses Magnets in the sides of the tracks constantly repel and attract magnets
1. 0 answers
2. 248 views
How does a maglev train move forward?(1 point)Responses Magnets in the sides of the tracks constantly repel and attract magnets
1. 0 answers
2. 197 views
What causes a maglev train to hover above the track?(1 point)Responses massive batteries massive batteries attractive magnetic
1. 1 answer
2. 212 views
Which is the best description of how to build an electromagnet?(1 point)Responses Wrap a wire around an iron or steel core at
1. 3 answers
2. 469 views
Which statement about electromagnetic is correcttwo north poles attract each other a north pole and south pole repel each other
1. 3 answers
2. 205 views
What creates the magnetic force in an electromagnetelectric current battery coiled wire iron or steel core I think it is
1. 1 answer
2. 219 views
What creates the magnetic force in an electromagnetelectric current battery coiled wire iron or steel core
1. 1 answer
2. 341 views
You are working with a team to improve an electromagnet. Which is an effective way to communicate your ideas?(1 point)Responses
1. 1 answer
2. 324 views
Which scenario describes how students can work together creatively to explore electromagnets?(1 point)Responses Three students
1. 1 answer
2. 461 views
Which scenario describes how students can work together creatively to explore electromagnets?(1 point)Responses Three students
1. 0 answers
2. 277 views
Samuel builds four electromagnets and tests them by picking up paperclips. Here are his partial results.Coils Paperclips 8 2 16
1. 1 answer
2. 387 views
Students built two electromagnets. The electromagnets are the same except that one has 20 wire coils around its core, and the
1. 1 answer
2. 414 views
what provides an electric current in an electromagnetbattery iron or steel core papaer clips wire Plzz I need this fast
1. 1 answer
2. 139 views