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Air surrounds any object on all sides. Even if an object is resting on a surface there is always air (even if only a thin layer) underneath. The pressure of the air above will exert a downward force. The air below will exert an upward force. Explain and discuss how the combination of these forces results in a net buoyant force due to the object being immersed in a sea of air. Why does it work out that the resulting force has exactly the value that it does?
How would the situation be different if there were no air (a vaccum) underneath the object? Then, what would be the net force due to the air pressure? [Note: a situation like this can actually occur with certain precision blocks and surfaces used in machine shops. They are so extremely flat that if allowed to come into contact the thin layer of air that would normally be between them is excluded. What problem do you think allowing such surfaces to touch would produce?]
Over 500 planets have so far been detected beyond our solar system. This is accomplished by looking for the effect the planet has on the star. The star is not truly stationary; instead, it and its planets orbit around the center of mass of the sys..
A copper pot with a mass of 0.485kg contains 0.175kg of water, and both are at a temperature of 20.0?C. Find the final temperature of the system
A 1600·kg car traveling with a velocity of 6·m/s north collides head-on with a 3200·kg truck traveling with a velocity of 4·m/s south. What impluse is delivered to the truck by the car
If each rock strikes the fixture traveling at 10.0 {rm m}/{rm s} horizontally and rebounds at 2.00 {rm m}/{rm s} backwards, find out how high above the lowest point does the impact make your light fixture swing?
A 1000-kg car is moving at 30 m/s around a horizontal curve whose radius is 100m. What is the magnitude of the frictional force
Two 8.0 coulomb light bulbs are connected in a 12 V series circuit. What is the power of both glowing bulbs
A goldfish is swimming inside a spherical bowl of water having an index of refraction n = 1.333. How many centimeters behind the glass
two narrow slits 50 microns apart are illuminated with light of wavelength 500nm. what is the angle of the m 2 bright
a container of cross-sectional area 117 cm2 contains liquid of density 2.4 gcm3 to a height of 5.10 cm above a small
In compressing the spring in a toy dart gun, 0.4 J of work is done. What is the dart's kinetic energy as it leaves the gun
A curve is banked at an angle of 30 degrees with respect to the horizontal. what is the ideal speed for a motorist to take the curve when it is covered by glare ice
A passenger in a train that moves horizontally looksoutside and sees a child hitting a ball straight up to a height of30 m. Find the speed of the train relative to the ground
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