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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.
assume that a proof plane is a conducting disc with a radius of 1.0 cm and is used to transfer some charge from the sphere described above. How much charge will be transferred in one scoop
A sledge loaded with bricks has a total mass of 18.1 kg and is pulled at constant speed by a rope. what is the energy lost due to friction
A spacecraft is in a circular orbit regarding the moon, 1.76x10 5 m above its surface. The speed of the spacecraft is1800 m/s, and the radius of the moon is 1.74x 10 6 m. If the moon were a smooth, reflective surface,
suppose the radius of the ball is very small compared to other length scales in the problem. Take starting level as step 0, the next step down as step 1, and so on.
a particle p with mass 9kg has position vector rr2.5m and velocity vv45.0 ms. it is acted on by force f f10.0 n. all
The focal length of diverging lens is negative. if f=-20cm for a particular diverging lens, where well the image be formed of an object locate 50cm to the left of the lens on the optical axis? What is the magnification of the image?
a particle with charge 7.88 microc is placed at the fixed position x 3.00 m in an electric field of uniform strength
An LC circuit has zero resistance, no battery, a capacitor C=70microFarads, and an inductor L=0.4H connected in a simple loop. The capacitor and inductor store a compined total energy of U=28microJoules.
A 24kg projectile is moving at 240m/s in the positive direction of the x axis when it explodes and divides into two fragments, What is the direction and speed of the other piece
A 0.16kg baseball is hit into the air. When its 6.68 meters above the ground traveling 17.2 m/s at a 55 degree angle. What is its mechanical energy?
A particle undergoes a displacement Δr of magnitude 57 m in a direction 25° below the x axis. Express Δr in terms of the unit vectors x and y.
People who suffer from cataracts may have the lenses in their eyes replaced by artificial lenses. what is the refractive power of the glasses she will need to see the object clearly
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