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A 100-W lightbulb has a resistance of about 12 ? when cold (20 ?C) and 140? when on (hot). Estimate the temperature of the filament when hot assuming an average temperature coefficient of resistivity
A 5 m x 12 m swimming pool slopes linearly from a 1.20 m depth at one end to a 3.40 m depth at the other. What is the mass of water in pool.
Before going into orbit, an astronaut has a mass of 55 kg. While in orbit, a measurement determines that a force of 100 N causes her to move with the acceleration of 1.90 m/s2. To regain her original weight, must she go on a diet or start eating m..
A car dealer claims that his product would accelerate at a constant rate from rest to a speed of 200 km/hr in 8s. What approximate distance will the car travel.
Two simple pendulums have length of 81-cm and 64-cm they are released from the same angular position at the same instant. After how much time would they both arrive at their initial position simultaneously.
A pendulum of length 50cm is pulled 30 cm away from vertical axis and free from rest. What would be its speed at the bottom of its swing.
A electron is accelerated from rest by the potential difference of 350 V. It then enters a uniform magnetic field of magnitude 200 mT with its velocity perpendicular to the field.
Two identical positive charges exert a repulsive force of 6.6 x10-9 N when separated by a distance of 5.4 10-10 m. what is the charge of each.
If you charge a pocket comb by rubbing it with a silk scarf, how can you determine if the comb is positively or negatively charged.
A loudspeaker of mass 18.0 {rm kg} is suspended the distance of h = 1.20 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 2.70 {rm m}. What is the tension T in each of the cables? Utili..
A dog running in an open field has components of velocity = 3.4 and = -1.9 at time = 10.4. For the time interval from = 10.9 to = 24.7, the average acceleration of the dog has magnitude 0.45 and direction 25.
Three deer, A, B, and C, are grazing in a field. Deer B located 64.00 m from dear A at an angle of 50° north of west. Deer C is located 76° north of east relative to dear A. The distance between deer B and C is 93m. What is the distance between de..
The specific heat of ethanol is 2.44 J/g·°C. How various kilojoules of energy are required to heat 50.0 g of ethanol from -20.0°C to 68.0°C.How far last car travel before momentarily coming to rest.
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