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A hot air balloon is a bit like a bubble in water. It rises in air when the mass of relatively cool surrounding air displaced by the balloon is greater than the mass of the balloon and the gondola that hangs below it. There is a big opening at the bottom of the balloon where a propane burner that heats the inside air is located. Air is free to move in or out of the balloon through the opening. The heated air inside is less dense than the surrounding cool air. The balloon has to have a volume great enough so that air heated to some maximum temperature has a low enough density to allow it to float. What is the buoyancy? What is the volume? do we use archimedes principle?
When two resistors are connected in a parallel configuration the voltages across each are the same, What are the currents through these resistors
A tsunami is generated by an earthquake off the coast of Alaska. It has a wavelength of 677 km. It travels at a distance of 3536 km in a period of 5.49 hr. What is the frequency of the wave in Hz?
(a) Determine the distance of the final image relative to the converging lens. (b) What is the height of the final image (including the proper algebraic sign)?
A 20.0cm -diameter cylinder of helium gas is 50.0cm long and at 30.0 ?C. The pressure gauge reads 130psi, How many helium atoms are in the cylinder
A Carnot engine extracts 950J from a 600K reservoir during each cycle and rejects 480J to a cooler reservoir. It operates at 22 cycles per second. Find the work done during each cycle
A student throws a set of keys vertically upward to his fraternity brother, who is in a window 3.60 m above. The brother's outstretched hand catches the keys 1.20 s later.
At the start of a race, a four-man bobsled team pushes their sled as fast as they can along a 50 m flat starting stretch. What is the speed of the sled right before the team jumps on the sled
A war-wolf or trebuchet is a device used during the Middle Ages to throw rocks at castles and now sometimes used to fling large vegetables and pianos as a sport. A simple trebuchet.
A cannon tilted up at a 30° angle fires a cannon ball at 65 m/s, What is the ball's impact speed on the ground below
Compute the value that the spring constant should have so that passengers undergo an acceleration of no more than 7.0 when brought to rest. Let be the total mass of the elevator and passengers.
While standing at the edge of the roof of a building, you throw a stone upward with an initial speed of 6.97 m/s. At what speed does the stone impact the ground
How much work must be done to bring three electrons. calculate the mass of an ice cube.
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