Introduction to Potential Energy

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Questions and Answers

What is the emergent speed of the bullet after it passes through the plywood?

  • 63.2 m/s (correct)
  • 20 m/s
  • 200 m/s
  • 100 m/s

How much of the initial kinetic energy does the bullet retain after passing through the plywood?

  • 50%
  • 5%
  • 10% (correct)
  • 20%

What formula is used to calculate the work done as shown in Fig. 5.3(a)?

  • $W = \frac{1}{2}mv_f^2 - \frac{1}{2}mv_i^2$
  • $W = \int F(x) dx$ (correct)
  • $W = \sum F(x)∆x$
  • $W = Fd$

What is the final speed of the bullet if the bullet has a mass of 0.05 kg?

<p>63.2 m/s (C)</p> Signup and view all the answers

What is the unit of power named after James Watt?

<p>Horse-power (D)</p> Signup and view all the answers

How many watts are equivalent to 59 horse-power?

<p>44000 W (B)</p> Signup and view all the answers

What is the energy consumption of a 100 watt bulb left on for 10 hours in kilowatt hours?

<p>1 kWh (A)</p> Signup and view all the answers

What physical quantities do we try to discover in physics that do not change in a physical process?

<p>Momentum and energy (D)</p> Signup and view all the answers

What term is used to describe the 'stored' energy possessed by a stretched bow-string or fault lines in the earth's crust?

<p>Potential energy (B)</p> Signup and view all the answers

In the context of potential energy, what happens when a body releases its stored energy?

<p>It converts to kinetic energy (C)</p> Signup and view all the answers

What results from the readjustment of fault lines in the earth's crust possessing a large amount of potential energy?

<p>Earthquakes (C)</p> Signup and view all the answers

What is the representation of the work done by the spring force in terms of the plot of Fs versus x for a compressed spring?

<p>Negative area (B)</p> Signup and view all the answers

What is the work done by the frictional force when the force is -50 N and the displacement is 20 m?

<p>-1000 J (D)</p> Signup and view all the answers

In the context of the work-energy theorem for a variable force, what does the shaded rectangle in Fig. 5.3(a) represent?

<p>Work done by a varying force over a small displacement (B)</p> Signup and view all the answers

If a woman pushes a trunk with a force that linearly reduces from 100 N to 50 N over a distance of 10 m, what happens to the applied force?

<p>Reduces linearly with distance (D)</p> Signup and view all the answers

In the work-energy theorem context, why is the area under the curve in Fig. 5.3 important when ∆x approaches zero?

<p>It is exactly equal to the work done by the varying force (A)</p> Signup and view all the answers

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