Physics Power: Solving a problem, Part 2

The video tutorial covers the calculation of work done in moving a car and the subsequent determination of average and instantaneous power. Initially, it discusses the challenges in identifying necessary parameters for work calculation. It then explains how to compute average power using work and time, converting the result into horsepower. Finally, it delves into calculating instantaneous power at a specific time using force and velocity, highlighting the difference between average and instantaneous power.

What is the primary challenge when calculating work in complex problems?

• Finding the necessary parameters

• Identifying the correct formula

• Converting units

• Understanding the concept of force

Which unit is used to express power in the context of this lesson?

• Joules

• Horsepower

• Watts

• Newtons

How is average power calculated?

• Force divided by distance

• Acceleration divided by force

• Work divided by time

• Velocity multiplied by time

What is the conversion factor from watts to horsepower?

• 1 horsepower = 1000 watts

• 1 horsepower = 746 watts

• 1 horsepower = 500 watts

• 1 horsepower = 1500 watts

What formula is used to calculate instantaneous power?

• Force times distance

• Force times velocity

• Velocity divided by time

• Work divided by time

At t = 2 seconds, what is the velocity of the car if the acceleration is 3.3 m/s²?

• 9.9 m/s

• 6.6 m/s

• 13.2 m/s

• 3.3 m/s

What is the instantaneous power in horsepower at t = 2 seconds?

• 66.2 horsepower

• 33.2 horsepower

• 55.2 horsepower

• 44.2 horsepower