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A helium weather balloon is used to lift a meteorological sensor package high up into the atmosphere. At Earth%u2019s surface it contains 3 m3 of helium at a pressure of 1 atmosphere. At the maximum height that the balloon reaches (~20 km), the volume of helium in the balloon expands to 42 m3. The temperature at the meteorological station where the balloon was released was 30 oC and at the balloon%u2019s maximum height, -56 oC.
a) Calculate the number of moles of helium in the balloon.
b) Find the atmospheric pressure the balloon experiences at its maximum height.
Determine the current density, resistance and electric for the copper wire, if the wire is 10 m long
A kayaker needs to paddle north across a 200 wide harbor. The tide is going out, creating a tidal current that flows east at 2.0. The kayaker can paddle with a speed of 3.0. In which direction must he paddle in order to travel straight across the har..
A small ferryboat is 4.00 m wide and 6.00 m long. When a loaded truck pulls onto it, What is the weight of the truck
To make a simple microscope a student places two converging lenses of +20 D at opposite ends of a 34 cm long tube. How far should an object be placed from the objective lens
one of your classmate has a friend with a boat. here is your classmate on water-skis being towed. what is the friction force of the water
A proton and an electron are moving due east in a constant electric field that also points due east, Determine the magnitude of the acceleration of the proton and the electron
An electrician connects two different bulbs in seriesto 120 V circuit. One bulb is rated as 40 W for a nominal voltage 220V, Which of the two bulb is producing more light
An underwater diver sees the sun 46 degrees above horizontal. How high is the sun above the horizon to a fisherman
A cylindrical permanent magnet has a volume of 202 cm3 and a uniform magnetization of 1.0 106 A/m along its axis. Find the magnetic torque exerted on the magnet
A flashlight bulb with a resistance of 40 ohm is powered with a 6 volt battery and produces 0.75W of power. what is the voltage across the battery terminals when the light bulb is on
A ceiling fan with 89.00 cm diameter blades is turning at 61rpm. Suppose the fan coasts to a stop 26s after being turned off.
A narrow tube open at one end has varibale length. When a vibrating tuning fork is held near one end, What is a possible frequency of the tuning fork
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