4. Mechanical Systems
Power And Energy — Quiz
Test your understanding of power and energy with 5 practice questions.
Practice Questions
Question 1
A block of mass $m$ is pulled up a frictionless incline by a constant force $F$ parallel to the incline. If the block moves a distance $d$ along the incline, and the incline makes an angle $\theta$ with the horizontal, what is the work done by the gravitational force?
Question 2
A projectile is launched vertically upwards with an initial kinetic energy of $E_k$. Ignoring air resistance, what is its kinetic energy when it reaches half of its maximum height?
Question 3
A car engine produces $150 \text{ kW}$ of power. If the car travels at a constant speed of $30 \text{ m/s}$, what is the magnitude of the force exerted by the engine?
Question 4
A spring is compressed by a distance $x$, storing elastic potential energy $E_p$. If the same spring is compressed by a distance of $2x$, how much elastic potential energy is stored?
Question 5
In a real-world engineering system, why is the output power always less than the input power?