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Consider a hot-air balloon. The deflated balloon, gondola, and 2 passengers have a combined mass of 315 kg. When inflated, the balloon contains 871 m^3 of hot air. Find the temperature (degrees celsius) of the hot air required to lift the balloon off the ground. The air outside the balloon has a temperature of 20.2 degrees C and a pressure of 0.916x 10^5 Pa. The pressure of the hot air inside the balloon is the same as the pressure of the air outside the balloon. The molar mass of air is 29 g/mol. Hint: first find the density of the air outside the balloon. Then use Archimedes' principle to find the density required for the air inside the balloon. Then find the temperature of the air inside the balloon.
The Yerkes telescope in southern Wisconsin is the largest refracting telescope in the world. Its objective lens is 40 inches (slightly over a meter) in diameter. What are the focal lengths of the two lenses
A ball rolls off a table with a horizontal velocity of 5 m/s If it takes 0.6 secs for it to reach the floor A. What is the verticle componet of the balls velocity just before it hits the floor? (use g= 10 m/s^2) B. What is the horizontal componet ..
alex and bob are twins working on a space station located at a fixed position in deep space. alex undertakes an
An experimenter bombards a target of 54Cr with alpha particles such as 4He + 54Cr -> p+ 57Mn Suppose the incoming alpha particle has 26MeV kinetic energy in the lab, What is the kinetic energy of the detected proton
Three particles of mass 8 kg, 5 kg, and 3 kg are connected by rigid rods of negligible mass lying along the y axis and are placed at 5 m, ?3 m, and ?7 m, Find the linear speed of the top particle of mass
A football is kicked straight up into the air; it hits the ground 3.8s s later, What was the greatest height reached by the ball, Assume it is kicked from ground level
A laboratory electromagnet produces a magnetic field of magnitude 1.53 T. A proton moves through this field with a speed of 5.42 106 m/s. What is the magnitude of the maximum acceleration of the proton
A box is sliding with a speed of 4.50 m/s on a horizontal surface when, at point P, it encounters a rough section. What is the coefficient of friction at the stopping point
question a golf ball strikes a hard smooth floor at an angle of ? 32.4deg and rebounds at the same angle. the mass of
A woman can read the large print in a newspaper only when it is at a distance of 59 cm or more from her eyes. What should be the refractive power (in diopters) of her glasses
The cone of a loudspeaker vibrates in SHM at a frequency of 262 Hz. The amplitude at the center of the cone is xm = 1.5 x 10-4m, What is its maximum velocity and acceleratio
Block 1, with mass m1 and speed 5.0 m/s, slides along an x axis on a frictionless floor and then undergoes a one-dimensional elastic collision with stationary block 2, How far into that region do the two blocks slide
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