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A recreational (open) hot air balloon (i.e., Pinside is approximately the same as Poutside) has a volume of 2187 m3 when fully inflated. The total weight of the basket, balloon, ballast and pilot is 1756.0 N (395 lb). How much less dense must the air in balloon be than the surrounding atmosphere in order to keep the balloon floating level near the ground?
find the resonance frequency of the ear canal. treat it as a half-open pipe of diameter 7.3 mm and length 24.5 mm.
Suppose 79kW is to be transmitted over two 0.105ohms lines. Estimate how much power is saved if the voltage is stepped up from 200V to 2000V and then down again, Estimate how much power is saved
Resistances of 2.9 ?, 4.5 ?, and 6.8 ? and a 17.1 V battery are all in series. Find the potential difference across the first (2.9 ?) resistor.
In 1.6 min, a car moving at constant speed travels halfwayaround a circular track that has a diameter of 1.7 km. What is the car's tangential speed
A jellyfish is floating in a water-filled glass tank 1.00 m behind a flat pane of glass 6.00 cm thick and having an index of refraction of 1.50. Where is the image of the jellyfish located
include a free body diagram. Be sure to label all forces with their agents and size. 1. A 5.0kg cat running along suddenly braces his furry feet on the slippery floot in order to stop.
A charged 2uF capacitor is connected in parallel with 0.5 MOhm resistor. a) How long after the connection is made with the voltage across the capacitor to 75% of its maximum value. b) How much thermal energy will be dissipated across the resistance a..
A force in the negative direction of an x axis is applied for 22 ms to a 0.53kg ball initially moving at 15 m/s in the positive direction of the axis. What is theaverage magnitude of the force on the ball
A soccer player 'heads' the size 5 ball deflecting it by 46.0°, and keeps its speed of 15.90 m/s constant. A size 5 ball has a mass of approximately 0.421 kg. What is the magnitude of the impulse which the player must impart to the ball.
Write x-versus-t equations of motion
two coupled boxcars are rolling along at 3.5 ms when they collide with and couple to a third stationary boxcar. a what
Runner A is initially 8.6 km west of a flagpole and is running with a constant velocity of 5.2 km/h due east. What will be the distance of the two runners from the flagpole
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