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A hot air balloon achieves itsbuoyant lift by heating the air inside the balloon, which makes itless dense than the air outside.
Suppose thevolume of a balloon is 1800m3 and the requiredlift is 2700N. Calculate the temperature of the air inside the balloon which will produce the required lift. Assume thatthe outside air temperature is 0*C and that air is an ideal gasunder these conditions. What factors limit the maximum altitude attainable by this method for a given load?
(Neglect variables like wind.)
The drawing shows two boxes resting on frictionless ramps. One boxis relatively light and sits on a steep ramp. The other box isheavier and rests on a ramp that is less steep. The boxes arereleased from rest at A and allowed to slide down the ramp..
white light with frequencies ranging from 4.00 x 1014hz to 7.90x1014hz is incident on a potassium surface. the work
An atom has only two levels, a ground state with energy -25.0 eV, What wavelength photon is required for stimulated emission of an electron in the excited state
To stop a car, first you require a certain reaction time to begin braking; then the car slows under the constant braking deceleration. determine the magnitude of the deceleration
A bimetalic strip consists of a thinstip of brass [Alphabrass=19X106(Co)-1] riveted to a thin strip of steel [Alphasteel=12X106(Co)-1]
A ray of sunlight is passing from diamond into crown glass; the angle of incidence is 28.10°. Determine the angle between the refracted blue and red rays in the crown glass
A 2.0kg solid cylinder (radius = 0.10m , length = 0.70m ) is released from rest at the top of a ramp and allowed to roll without slipping. When the cylinder reaches the bottom of the ramp, what is its total kinetic energy
A 200 kg communications satellite is placed into a circularorbit around the Earth with a radius of 4.23 x 107m(26,000 miles). Find the gravitational force on the satellite
An inductor L = 0.0470 H and a 35.0 ? resistor are connected in series to a 3.70 volt battery and a switch. What is the potential difference across the resistor immediately after the switch is closed
A spacecraft is traveling with a velocity of v0x = 4330 m/s along the +x direction. Two engines are turned on for a time of 728 s. One engine gives the spacecraft an acceleration in the +x direction of ax = 1.74 m/s2.
Consider two dipoles, p1, oriented along z at the origin, and p2 oriented along x at a distance r in the x-y plane. Given that the torque on a dipole in a field E can be written N=p cross E, find the torque on each dipole about its centre.
An air-filled spherical capacitor is constructed with an inner-shell radius of6.50cm and an outer-shell radius of15.0cm. What potential difference between the spheres results in a 4.00-µC charge on the capacitor
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