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Questions in physics

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

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

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

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

[Homework Help] 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 |

[Homework Help] 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.

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

[Homework Help] 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

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

[Homework Help] In a free fall situation, which of the following statements is true? A. Objects with more mass fall faster. B. Objects do not accelerate when falling. C. Objects with less mass fall faster. D. All objects fall at the same rate, regardless of their mass.