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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?
A daring ranch hand sitting on a tree limb wishes to drop vertically onto a horse galloping under the tree. The constant speed of the horse is 12.0 m/s, and the distance from the limb to the level of the saddle is 4.00 m.
A sled weighing 200 N is held in place by static friction on a 15? incline, What is the coefficient of static friction between the sled and the incline
A large refracting telescope has an objective lens with focal length 0.85 m. What is the new angular magnification
q1. a 170 g block hangs from a spring with spring constant 9.0 nm. at t0 s the block is 24 cm below an equilibrium
A drop of mercury released in the ocean and it sinks. Calculate the percentage change in the volume of the drop of mercury when it is at a depth of 1.0 km below the ocean surface
A trapeze artist swings in simple harmonic motion with a period of 4.2s. The acceleration of gravity is 9.81m/s2. Compute the length of the cables supporting the trapeze.
The planet Mercury has a mass that is 5.00% of that of Earth, and its gravitational acceleration is gmercury = 3.70 m/s2. a) How long does it take for a rock that is dropped from a height of 2.63 m to hit the ground on Mercury?
Find the change in momentum of a 1380 kg car that increases its speed from 6.0 m/s to 16.0 m/s in a time of 16 s while traveling in the same direction? Express your answer to two significant figures and include the appropriate units. What minimum for..
An object of mass m= 1.00 kg is moving initially with a speed of 2.0 m/s along positive x- direction, Determine the speed and direction of motion of second object
Two traveling sinusoidal waves are described by: y1=(5.00m) sin[4.00x-1200t] and y2=(5.00m) cos[4.00x-1200t] Determine amplitude, wavelength, frequency and speed of the resultant wave.
When point charges q1 = +2.4 µC and q2 = +1.3 µC are brought near each other, each experiences a repulsive force of magnitude 0.39 N. Determine the distance between the charges.
When a turntable rotating at 45 rev/min is shut off, it comes to rest in 20 s. Find the angular acceleration
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