16 Questions
What is the emergent speed of the bullet after it passes through the plywood?
63.2 m/s
How much of the initial kinetic energy does the bullet retain after passing through the plywood?
10%
What formula is used to calculate the work done as shown in Fig. 5.3(a)?
$W = \int F(x) dx$
What is the final speed of the bullet if the bullet has a mass of 0.05 kg?
63.2 m/s
What is the unit of power named after James Watt?
Horse-power
How many watts are equivalent to 59 horse-power?
44000 W
What is the energy consumption of a 100 watt bulb left on for 10 hours in kilowatt hours?
1 kWh
What physical quantities do we try to discover in physics that do not change in a physical process?
Momentum and energy
What term is used to describe the 'stored' energy possessed by a stretched bow-string or fault lines in the earth's crust?
Potential energy
In the context of potential energy, what happens when a body releases its stored energy?
It converts to kinetic energy
What results from the readjustment of fault lines in the earth's crust possessing a large amount of potential energy?
Earthquakes
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?
Negative area
What is the work done by the frictional force when the force is -50 N and the displacement is 20 m?
-1000 J
In the context of the work-energy theorem for a variable force, what does the shaded rectangle in Fig. 5.3(a) represent?
Work done by a varying force over a small displacement
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?
Reduces linearly with distance
In the work-energy theorem context, why is the area under the curve in Fig. 5.3 important when ∆x approaches zero?
It is exactly equal to the work done by the varying force
Explore the concept of potential energy and its application in various scenarios, such as a stretched bow-string and fault lines in the earth's crust. Learn how potential energy represents stored energy with the possibility for action.
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