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(a) How much power is radiated by a tungsten sphere (emissivity e = 0.35) of radius 21 cm at a temperature of 28°C?
______W
(b) If the sphere is enclosed in a room whose walls are kept at -5°C, what is the net flow rate of energy out of the sphere?
Billy has a bucket that has a mass of 150 g, in which he put 150 g of fresh water. He has tied 150-cm of string to the handle of the bucket.
An unstable high energy particle is created in the laboratory, and it moves at a speed of 0.968c. Calculate what is the proper distance traveled
A small metal ball is given a negative charge, then brought near (i.e., within a few millimetres) to end A of the rod. What happens to end A of the rod when the ball approaches it closely this first time.
Write the expression for the differential length vector d l at the point (1, 2, 8) on the straight line y = 2x, z = 4y, and having the projection dx on the x-axis.
A particle with a charge of 5 x 10^-6 C and a mass of 20g movesuniformly with a speed of 7m/s in a circular orbit around astationary particle with a charge of -5 x 10^-6 C. What is the radius of the orbit?
Flywheels are large, massive wheels used to store energy. They can be spun up slowly, then the wheel's energy can be released quickly to accomplish a task that demands high power. How much energy is stored in the flywheel
Consider electrons accelerated to a total energy of 20.0 GeV in the 3.00-km-long Stanford Liinear Accelerator. What is the factor ? for the electrons? What is the electrons' speed at the given energy?
A 79 kg runner exerts 340 N of horizontal force as he pushes off the ground. The vertical ground reaction force at this time is 970 N. There are 75 N of air resistance working against his motion. What is the direction in degrees of the resultant exte..
A copper calorimeter can with mass 0.169 kilogram contains 0.201 kilogram of water and 2.90×10-2 kilogram of ice in thermal equilibrium at atmospheric pressure. estimate what is the final temperature of the system
The speed of sound is 343 m/s. A siren at the starting point remains stationary. How far has the motorcycle gone when the driver hears the frequency of the siren at 90.0% of the value it has when the motorcycle is stationary?
A father racing his son has three-fifths the kinetic energy of the son, who has half the mass of the father. What is the original speed of the son
Two 4.0-g spheres are suspended by 9.0-cm-long light strings. determine the electric field intensity that enables the spheres to be in equilibrium at ? = 12°
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