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Questions in physics

[Jawaban] How does the electric force between two charged particles change if the distance between them is reduced by a factor of 2? A. It is reduced by a factor of 4. B. It is increased by a factor of 2. C. It is reduced by a factor of 2. D. It is increased by a factor of 4.

[Jawaban] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Jawaban] What is the only force that can act on an object in free fall? A. gravity B. friction C. air resistance D. speed

[Jawaban] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Jawaban] What materials does a Class D fire involve? A. Oil B. Paper C. Liquids D. Metals

[Jawaban] In a theme park, passengers in a car are initially at rest at the top of the track. The car then travels down and round a circular loop in the track. What form(s) of energy is possessed by the car and passengers at points [tex]$X$[/tex] and Y? KE = kinetic energy; GPE = gravitational potential energy | | X | Y | |---|---|---| | A | GPE only | KE only | | B | GPE only | KE and GPE | | C | KE only | GPE only | | D | KE only | KE and GPE |

[Jawaban] How does increasing the distance between charged objects affect the electric force between them? A. The electric force increases because the distance has an indirect relationship to the force. B. The electric force increases because the distance has a direct relationship to the force. C. The electric force decreases because the distance has an indirect relationship to the force. D. The electric force decreases because the distance has a direct relationship to the force.

[Jawaban] What is the only force that can act on an object in free fall? A. gravity B. friction C. air resistance D. speed

[Jawaban] Select the correct answer. What is the momentum of a $1.5 \times 10^3$ kilogram van that is moving at a velocity of 32 meters/second? A. 46.9 kilogram meters/second B. $47 \times 10^3$ kilogram meters/second C. $4.85 \times 10^2$ kilogram meters / second D. $4.85 \times 10^4$ kilogram meters/second

[Jawaban] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?