L4 Physics - Homework

What is physics primarily concerned with?

• The study of living organisms.

• The science of how the world and the entire universe works.

• The properties and reactions of matter.

• The study of Earth's physical structure and substances.

Which of the following are the four essential conditions that describe an object's physical place in the universe?

• Mass, energy, force, and power.

• Time, position, velocity, and acceleration.

• Length, width, height, and depth.

• Temperature, pressure, volume, and density.

What characterizes one-dimensional motion?

• Movement in a circular path.

• Movement that can only occur back and forth along a single line.

• Movement that is free to move in all three dimensions.

• Movement with constant speed but changing direction.

What are the standard units for acceleration?

• meters per second (m/s)

• meters per second squared (m/s²)

• meters (m)

• seconds (s)

Which formula correctly represents average velocity?

• Change in velocity divided by change in time (Δv/Δt)

• Change in position divided by change in time (Δx/Δt)

• Initial velocity plus acceleration times time (v₀ + at)

• One-half acceleration times time squared (1/2 at²)

What is the equation for the definition of acceleration?

• Average velocity equals initial velocity plus acceleration times time (v̄ = v₀ + at)

• Displacement equals initial velocity times time plus one-half acceleration times time squared (x - x₀ = v₀t + 1/2 at²)

• Acceleration equals change in velocity divided by change in time (a = Δv/Δt)

• Final velocity squared equals initial velocity squared plus two times acceleration times displacement (v² = v₀² + 2a(x - x₀))

A car starts from rest and travels 122 meters in 7 seconds. What is its final velocity?

• 17.4 m/s

• 24.5 m/s

• 35 m/s

• 49 m/s