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A student wishes to design a flashlight that will work without batteries. The student plans to use electromagnetic induction to push charge into a capacitor. The capacitor will store the charge until the flashlight is switched on. The student has a variety of magnets and a lot of copper wire. Discuss the specific design features the student should use to create the most efficient induction process. Explain your reasoning.
The passengers in a roller coaster car feel 50% heavier than their true weight as the car goes through a dip with a 28 m radius of curvature, What is the car's speed at the bottom of the dip
Interstellar space has a magnetic field on the order of 0.1 nT. Matter in this space is mainly Hydrogen atoms (about 1 per cubic centimeter) moving with speeds of about 1 km/s. Compare the energy in the magnetic field to the Kinetic Energy of the ato..
A rigid tank contains water vapor at 250°C at an unknown pressure?. The tank is cooled to 150°C when the water vapor starts to condense. Estimate the initial pressure in the tank The final state is saturated vapor.
Two point masses m and M are separated by a distance d. If the distance between the masses is increased to 3d. how does the gravitational force between them change?
A section of copper transmission line carries a steady current of 265A and has resistance 0.82 ohem, Ignoring the energy needed to refrigerate the superconductor, how much energy will be saved in one year
A 9.15 kg object on a horizontal frictionless surface is attached to a spring with k = 2350 N/m. find the initial potential energy of the block-spring system
When Philippe Petit was in the middle of the wire between the World Trade Center Towers the wire depressed 1 ft. If during his 40 minutes of tricks the wire began to oscillate up and down from this equilibrium position by 6 inches, where is his ki..
Find the critical angle of incidence for a ray of light going from a diamond to air
From the top of a 90 m cliff, Aaron throws a ball directly downwards with an initial velocity of 1.80 m/s. What is the average velocity of the ball through this trip? How long in seconds does the ball take to reach the ground?
a rod of mass m and length l l 3m is pivoted on a frictionless hinge at the end. the rod is held at rest horizontally
An airplane with a speed of 87.7 m/s is climbing upward at an angle of 35.1 ° with respect to the horizontal. determine the angle of the velocity vector of the package
A container with a one-liter capacity at 27°C is filled with helium to a pressure of 2 atm. (1 atm = 1.0x10^5 N/m^2.) How many moles of helium does it hold
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