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Suppose you currently have 7, 60 Watt, incandescent light bulbs which are on for 4.4 hours a night, every night (365 nights). If electricity costs 11.2 cents per kilowatt-hour, theoretically what wattage LED bulbs are needed if you were to place all your incandescent bulbs (keeping them on the same amount of time) to save $37 per year on the cost of running light bulbs?
A nuclear power plant produces an average of 4.90 × 103 MW of power during a year of operation. Find the corresponding change in mass of reactor fuel
a solenoid of 200 turns carrying a current of 2 a has a length of 25 cm. what is the magnitude of the magnetic field at
A 1500 kg vehicle is making a circular turn on a flat roadway. The road has a radius of curvature of 50m and the static coefficient of friction between the tire and the road is 0.7
The fourth harmonic is four times the frequency of the fundamental. A node is a position on a standing wave of minimum displacement. Frequency is inversely proportional to wavelength, wave speed constant
the far point of an eye is 190 cm. a corrective lens is to be used to allow this eye to focus clearly on objects a
A wheel is placed on a test stand so that it is free to turn on its axle. What is the moment of inertia of the wheel
An extreme amusement park ride accelerates its riders upward from rest to 50.0 m/s in 7.00 seconds. Ignoring air resistance, what average upward force does the seat exert on a rider who weighs 1120 N?
The heaviest and lightest strings on a certain violin have linear densities of 3.0 and 0.29 g/m. What is the ratio of the diameter of the heaviest string to that of the lightest string, assuming that the strings are of the same material?
Using Newton's Version of Kepler's Third Law II Part A Pluto's moon Charon orbits Pluto every 6.4 days with a semimajor axis of 19,700 kilometers. Calculate the combined mass of Pluto and Charon
a projectile with mass of 346 kg is launched straight up from the earths surface with an initial speed vi. what
A 2.40g bullet embeds itself in a 1.50kg block, which is attached to a spring of force constant 770 N/m. Find the time for the bullet-block system to come to rest
a race car driver must average 199.0 kmh over the course of a time trial lasting ten laps. if the first nine laps were
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