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1. A hot-air balloon achieves its buoyant lift with heating the air inside the balloon, which makes it less dense than the air outside. Suppose the volume of a balloon is 1600 m3 and the needed lift is 2200 N (rough estimate of the weight of the equipment and passenger). Compute the temperature of the air inside the balloon which will produce the required lift. Suppose that the outside air temperature is 0°C and that air is an ideal gas under these conditions.
What factors limit the maximum altitude attainable by this method for a given load? (Neglect variables like wind.)
2. An ordinary glass is full to the brim with 359.0 mL of water at 100°C. If the temperature decreased to 22°C, how much water could be added to the glass?
A gamma ray photon produces an electron-positron pair each with a kinetic energy of 210 KeV. What was the energy and wavelength of the photon
The noise level in an empty examination hall is 40 dB. When 100physics students are writing an exam, the sounds of heavy breathingand pens traveling rapidly over paper cause the noise level to riseto 63 dB (not counting the occasional groans).
A layer of air has a temperature T0 of 30 Celsius at ground level and a lapse rate ? of 20 Celsius/km. determine its upward velocity at that point
A flea jumps straight up to a maximum height of 0.470 m. What is its initial velocity v_0 as it leaves the ground.
A spinning flywheel has rotational inertia I = 403.9 kg · m2. What is the frictional torque acting
When illuminated with light of 600nm (6*10^-7 m), the first dark fringe produced by a single slit lies a distance of 1.4 cm from the center of the screen placed 3.0 m from the slit
A machinist turns the power on to a grinding wheel, at rest, at time t = 0 s. The wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 83 rad/s. The wheel is run at that angular velocity for 29 s and then power is shu..
an object is attached to a hanging unstretched spring and slowly lowered to its equilibrium position a distance of
A swift blow with the hand can break a pine board. As the hand hits the board, the kinetic energy of the hand is transformed into elastic potential energy of the bending board, what is the average force on the hand
How much work is completed by the Moon's gravitational field as a 915kg meteor comes in from outer space and impacts on the Moon's surface.
A series RCL circuit includes a resistance of 271 ?, an inductive reactance of 661 ?, and a capacitive reactance of 425 ?. What is the voltage of the generator
would you get the same relationship between distance up the ramp parallel to the ramp rather than height and stopping
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