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Compute the temperature at which a tungsten filament that has an emissivity of 0.35 and a surface area of 3.0*10-5 m2 will radiate energy at the rate of 15 W in a room where the temperature is 13°C.
Suppose that a binary star system consists of two stars of equal mass. They are observed to be separated by 400 million kilometers and to take 3.0 Earth years to orbit about a point midway between them. What is the mass of each?
When a 2.10-kg object is hungvertically on a certain light spring described by Hooke's law, thespring stretches 2.84 cm. What is the force constant of the spring
A 130 horizontal beam is supported at each end. A 310 piano rests a quarter of the way from one end. What is the vertical force on each of the supports
The nucleus of a hydrogen atom is a single proton, which has a radius of about 1.2 × 10-15 m. What is the ratio of the density of the hydrogen nucleus to the density of the complete hydrogen atom
Find the change in speed of a rock thrown straight down from the top of the wall at an initial speed of 7.90 m/s and moving between the same two points
If a person's food energy intake is 2400 kilocalories per day and if all this energy is given off as heat, what is the average rate of heat output in watts
A typical laboratory centrifuge rotates at 4000 rpm. Test tubes have to be placed into a centrifuge very carefully because of the very large accelerations. What is the acceleration at the end of a test tube that is 10 cm from the axis of rotation
The primary coil of a transformer has 232 turns; the secondary coil has 1900 turns. An alternating current is sent through the primary coil. What is the emf amplitude in the secondary
A plane travels horizontally at 737 m/s at an angle of 35.9 degrees west of north. find the component of the speed of the plane west
a spaceship is heading toward a planet. while descending to the surface its rockets produce 25 kn of upward thrust and
two kg of ammonia are compressed adiabatically from a saturated vapor state at 20 c. the dead state is p0 1 bar t0
Two cylindrical rods, one copper and the other iron, are identical in lengths and cross-sectional areas. What is the voltage between the ends of the copper rod
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