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A hot-air balloon is accelerating upward under the influence of twoforces, its weight and the buoyant force. For simplicity, considerthe weight to be only that of the hot air within the balloon, thusignoring the balloon fabric and the basket. The hot air inside theballoon has a density of ρhot air = 0.80kg/m3, and the density of the cool air outside isρcool air = 1.29 kg/m3. What is the acceleration of the rising balloon?
A force, F(vector) =(2xˆ+3yˆ) N, is applied to an object at a point whose position vector with respect to the pivot point is r(vector) =(4xˆ+4yˆ+4zˆ) m
We accelerate electrons between two parallel plates a few cm apart. We apply 2.05 MV across the plates. Find the momentum of the electron
an air-track glider attached to a spring oscillates between the 10 cm mark and the 60 cm mark on the track. the glider
the shinkansen, the japanese train, runs at high speed. riding on the shinkansen, you notice that the frequency of a crossing signal changes markedly as you pass the crossing. what is the speed of the train
Two buckets of sand hang from opposite ends of a rope thatpasses over an ideal pulley. One bucket is full and weighs 120 N;the other bucket is only partly filled and weighs 63N.
Albert is pulling a 25.0 kg block up a hill which has an angle of ï?± = 15.50, calculate the work done by each force listed, and thus find the total work done on the block
a ball is thrown straight down from the top of a cliff with a speed of 5 ms. the cliff-top is 20 m above ground level.
A solenoid is to have an inductance of 0.274 mH, a cross-sectional area of 5.73 10-4 m2, and a length of 37.9 cm. How many turns per unit length should it have
A current-carrying wire of length 0.5m is at the Equator. Assuming that the magnetic field of the Earth has magnitude of 5 x 10^-5 T, what current is required to allow the wire to be suspended
I have a cube of charge 1 cm on a side. The total charge is 1 coulomb. Using gauss's law, calculate the electric field due to the charge a kilometer away
an rc series circuit has r 71.5omega and c 580nf . the series combination is connected across a 200v rms 68hz power
the magnitude of the charges is q 7.1 microc and the distance between them is d 4.9 mm.what is the algebraic
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