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A child's helium-filled balloon escapes at sea level and18oC. When it reaches an altitude of 3800 m, where thetemperature is 8oC and the pressure only 0.6 atm, what is the ratio of the initial volume to the final volume?
If a real object is placed inside the focal point of a diverging lens, the image is_______.
On a clear night a laser rotated at an angular velocity of 1 radian s-1 produces a spot of light that is visible on Jupiter, 600 x 106 km distant. How fast does the spot of light move across Jupiter? Does this violate the theory of relativity? Exp..
A 299 turn solenoid has a radius of 8.00 cm and a length of 22.0 cm. Find the energy stored in it when the current in its windings is 0.495 A
The magnetic field in the air gap between the magnetic poles and the armature of an electric generator has a flux density of 0.7T. The length of the wires on the armature is 0.5m. How fast must these wires move to generate a maximum EMF of 1.00V in e..
The 2.0 cm diameter coil shown below has 25 turns and has a current flowing through it of 5.00 A. What is the average change in flux (25 turns) going from 30 to 90 degrees
a female orb spider has a mass of 0.45 g. she is suspended from a tree branch by a 1.2 m length of 0.0020mm diameter
A charge Q is uniformly distributed throughout a nonconducting sphere of Radius R. What is the magnitude of the electric field at a distance of R/2 from the center of the sphere? What is the magnitude of the electric field at a distance of 2R from th..
sodium ions na move at 0.859ms through a bloodstream in the arm of a person standing near a large magnet. the magnetic
After a day of testing race cars, you decide to take your own 1580kg car onto the test track. While moving down the track at 10.0 m/s, you uniformly accelerate to 28m/s in 10 s. What is the average net force that you have applied to the car throug..
The coefficient of static friction between the stone and each side of the tread channel is 0.7. While the tire surface is rotating at a maximum speed of 1 m/s, the stone flies out of the tread. The magnitude FN of the normal force that each side of t..
A crate of eggs is located in the middle of the flat bed of a pickup truck as the truck negotiates a curve in the flat road. how fast can the truck be moving without the crate sliding
A 16 kg girl slides down a playground slide that is 2.8 m high. When she reaches the bottom of the slide, her speed is 1.3 m/s. How much energy was dissipated by friction
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