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A weather balloon is designed to expand to a maximum radius of 17 m when in flight at its working altitude where the air pressure is 0.034 atm and the temperature is 245 K. If the balloon is filled at atmospheric pressure and 398 K, what is its radius at lift-off?
Estimate the acceleration of cyclist, and roller coaster.
A sign (mass 1800kg ) hangs from the end of a vertical steel girder with a cross-sectional area of0.019m2 . Ignore the mass of the girder itself. What is the stress within the girder
how long would it take a car to return to its starting place if it traveled 180 ms average speed of 90 kmhr and
If the plant produces electric energy at the rate of 1.3GW , how much exhaust heat is discharged per hour
A person is standing 8 m away from a speaker and experiences an intensity level consistent with the standard pain threshold. what is the power of the speaker
A point charge +2.40 is held stationary at the origin. A second point charge -4.30 moves from the point = 0.175 , = 0 , How Much work is done by the electric force on q2
If the pressure of the 3 cm3 volume is reduced to 2.0 10-11 Pa (an extremely good vacuum) while the temperature remains constant, how many moles of gas remain in the container
A simple pendulum in a science museum entry hall is 3.51m long, has a 1.25kg bob at its lower end, and swings with an amplitude of 10.50 degrees. How much time does the pendulum take to swing from its extreme right side to its acute left side.
A portable electric heater uses 14 Amp of current. What is the smallest radius of copper wire that can be used in the extension cord
Two capacitors are connected in series. Let 3.00?F be the capacitance of first capacitor, 5.50?F the capacitance of the second capacitor, Calculate the potential difference across each capacitor
A horizontal force of 822 N is needed to drag a crate across a horizontal floor with the constant speed. You drag the crate using a rope held at an angle of 34° (from the horizontal).
A solenoid 2.9 m long has a radius of 0.85 cm and 630 turns. It carries a current I of 2.5 A. What is the approximate magnetic field B on the axis of the solenoid
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