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Calculate the temperature at which a tung- sten filament that has an emissivity of 0.25 and a surface area of 6.6×10?5 m2 will radiate energy at the rate of 51Win a roomwhere the temperature is 26?C. The Stefan-Boltzmann constant is 5.6696 × 10?8 W/m2 · K4 . Answer in units of ?C.
An unstretched elastic spring has a mass M = 3.75 kg and a length of l0 = 0.525 m. What is the elastic potential energy of the spring
An object weighing 330 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 265 N. Find the density of the object
A 1.65 block is attached to a spring with spring constant 17. While the block is sitting at rest, a student hits it with the hammer and almost instantaneously gives it a speed of 59.
A light spring-gun projectile launcher is mounted on an 0.393 kg air track glider. What is the speed of the air-track glider after the gun is fired
Assuming the Earth's magnetic field averages about 0.50*10^-4 T near the surface of the Earth, estimate the total energy stored in this field
A railroad car of mass 2.3 104 kg moving at 3.50 m/s collides and couples with two coupled railroad cars, compute the speed of the three coupled cars after the collision
Consider the circuit shown in the figure below, where C1 = 2.00 µF, C2 = 9.00 µF, and ?V = 18.0 V. Calculate the final charge on each capacitor
A steel rod has a length of exactly 0.2cm at 30degree centigrade. what will be its length at 60degree centigarde?
Two sound waves have intensities of 0.100Wm^2 and 5.00W/^2. What is the difference in their intensity levels
A 76kg student consumes 2500 Cal each day and stays the same weight. One day, he eats 3500 Cal and, wanting to keep from gaining weight, decides to "work off" the excess by jumping up and down.
A gymnast does a one-arm handstand. The humerus, which is the upper arm bone between the elbow and the shoulder joint, What is the compressional strain of the humerus
A guitar string is fixed between two points, 53.0cm apart. Its linear density is 12.0g/m. Now suppose the string is vibrating in its third harmonic. What is the distance between nodes
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