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Prairie dogs are burrowing rodents. They do not suffocate in their burrows, because the effect of air speed on pressure creates sufficient air circulation. The animals maintain a difference in the shapes of two entrances to the burrow, and because of this difference, the air (ρ = 1.29 kg/m3) blows past the openings at different speeds, as the drawing indicates. Assuming that the openings are at the same vertical level, find the difference in air pressure between the openings.
The temperature dissimilarity between the inside and the outside of a home on a cold winter day is 57.0°F. Express this difference on the Kelvin scale.
A cafeteria tray dispenser supports a stack of trays on a shelf hangs from four identical spiral springs under tension, one near each corner of the shelf. Each tray is rectangular, 45.3 cm by 35.6cm, 0.450 cm thick, and with mass 580g. Demonstrate..
A model rocket rises with constant acceleration to a height of 3.8 m, at which point its speed is 24.0 m/s. How much time does it take for the rocket to reach this height
An organ pipe is open at one end and closed at the other. The pipe is designed to produce the note middle C, What is the frequency of the second harmonic
When a resistor is connected by itself to an ac generator, theaverage power delivered to the resistor is 1.36 W. When a capacitoris added in series with the resistor, the power delivered is 0.831W. When an inductor is added in series with the resi..
You find a used battery and discover that it is no longer strong enough to power your CD player. What is the potential difference
A rabbit runs in a straight line with a velocity of +1.4 m/s for a period of time, rests for 11 s, and then runs again along the same line at +0.67 m/s for an unknown amount of time. The rabbit travels a total distance of 1224 m, and its average spee..
a copper wire has a resistance of 0.425 ohms at 20.0degc and an iron wire has a resistance of 0.455 ohms at the same
It takes 25 turns to drive a screw completely into a block of wood. Because the friction force between the wood and the screw is proportional to the contact area between the wood, what is the total work (in J) required to drive in the screw
A clever physics professor designs a cat-cannon and uses it to launch a 5 kilogram cat horizontally off the top of the sears tower, Find with what initial velocity must the cat be launched
q. a group of swimmers is resting in the sun on an off-shore raft. they estimate that 4.8 m separates a trough and an
A boulder of mass 45 kilogram is pushed on a surface with a coefficient of sliding friction of 0.855 N. Find what force has to be applied to produce an acceleration of 0.2 m per second squared
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