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A) A balloon of radius 30.5 cm is sprayed with a metallic coating so that the surface is conducting. A charge of 6.65×10-8 C is placed on the surface. What is the potential on the balloon's surface?
B) Suppose that the some air is let out of the balloon, so that the radius shrinks to 11.5 cm, what is the new potential on the balloon's surface?
C) What is the change in electrical potential energy during the shrinking process? For your own interest, what does the work needed to change the potential energy?
Commercial aircraft fly near 200mb where the outside temperate is -60 degrees Celsius. Calculate the temperature of the air if compressed adiabatically to the cabin pressure of 1000mb.
Spiderman, whose mass is 70.0 kg, is dangling on the free end of a 12.6-m-long rope, the other end of which is fixed to a tree limb above. find How much work was done by the gravitational force on Spiderman in this maneuver
Steam at 18 MPa and 600 C is contained in a cylinder of volume 0.5 m^3. Calculate the heat rejcted by the steam
A subway train has a sound intensity level of 90 dB, and a rock band has a sound intensity level of 110 dB. How many times greater is the sound intensity of the band than that of the train
A 10 kg picture is held in place by two wires, the first hanging at 35 degrees to left of vertical and second at 45 degrees to right of vertical
A lens placed at the origin with its axis pointing all along the x axis produces a real inverted image at x=-24cm that is twice as tall as the object. What is an image distance.
A Japan Airlines Boeing 747 accelerates from rest to lift-off speed of 78.51 m/s in 28.20 s. What is the mass of the plane
A spring is initially compressed by 17.5 cm. If it takes 7.166 J of work to compress the spring an additional 3.5 cm, what is the spring constant of the spring
a 0.90 kg book rests on a table. A downward force of 3.5 N is exerted on the top of the book by a hand pushing down on the book. What is the gravitational force acting on the book
The plates of a capacitor are separated by0.0050 m. The capacitor is charged by a potentialdifference of 5.0 V and then disconnected. Now you separatethe plates to a distance of 0.015 m. What is the new potential difference between the plate
A certain substance has a mass per mole of 42 g/mol. When 313 Jis added as heat to a 25.0 g sample ofthis material, How many moles of the substance are present
An electric field does 11.10 MeV of work in moving a very small charged particle from point a to point b through a potential difference of -2.22 MV
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