Podcast
Questions and Answers
What is the emergent speed of the bullet after it passes through the plywood?
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?
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)?
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?
What is the final speed of the bullet if the bullet has a mass of 0.05 kg?
What is the unit of power named after James Watt?
What is the unit of power named after James Watt?
How many watts are equivalent to 59 horse-power?
How many watts are equivalent to 59 horse-power?
What is the energy consumption of a 100 watt bulb left on for 10 hours in kilowatt hours?
What is the energy consumption of a 100 watt bulb left on for 10 hours in kilowatt hours?
What physical quantities do we try to discover in physics that do not change in a physical process?
What physical quantities do we try to discover in physics that do not change in a physical process?
What term is used to describe the 'stored' energy possessed by a stretched bow-string or fault lines in the earth's crust?
What term is used to describe the 'stored' energy possessed by a stretched bow-string or fault lines in the earth's crust?
In the context of potential energy, what happens when a body releases its stored energy?
In the context of potential energy, what happens when a body releases its stored energy?
What results from the readjustment of fault lines in the earth's crust possessing a large amount of potential energy?
What results from the readjustment of fault lines in the earth's crust possessing a large amount of potential energy?
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?
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?
What is the work done by the frictional force when the force is -50 N and the displacement is 20 m?
What is the work done by the frictional force when the force is -50 N and the displacement is 20 m?
In the context of the work-energy theorem for a variable force, what does the shaded rectangle in Fig. 5.3(a) represent?
In the context of the work-energy theorem for a variable force, what does the shaded rectangle in Fig. 5.3(a) represent?
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?
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?
In the work-energy theorem context, why is the area under the curve in Fig. 5.3 important when ∆x approaches zero?
In the work-energy theorem context, why is the area under the curve in Fig. 5.3 important when ∆x approaches zero?
