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a) How much power is radiated with a tungsten sphere (emissivity e= 0.35) of radius 22cm at a temperature of 25 degrees celsius.
b) If the sphere is enclosed in a room whose walls are kept at -5 degree celsius what is the net flow rate of energy out of the sphere?
If material increases its length by 4.2% when its temperature is raised 40 degrees C, then what is its coefficient of linear expansion
An applied force F1= 16N acting on an object with the mass m = 2 kg which is moving on the surface of a table. find the coefficient of friction between the object and the table
Calculate the maximum value of resistance that can be obtained by combining resistors of 31 , 47 , and 64
A power line carrying a sinusoidally varying current with frequency = 60 Hz and peak value I = 55 kA runs at a height of 7 m across a farmer's land. The farmer constructs a vertically oriented 2 m high 10 turn rectangular wire coil below the power..
A 0.100 kg block is suspended from a spring. When a small pebble of mass 40 g is placed on the block, What is the net force on the pebble when it is at a point of maximum upward displacement
Given a coaxial cable with a solid inner conductor of radius a, anouter conductor with radius from b to c so that a
A Martian leaves Mars in a spaceship that is heading to Venus. On the way, the spaceship passes earth by a speed v = 0.86c relative to it. Suppose that the three planets do not move relative to each other through the trip. The distance among Mars and..
Calculate the orbital period of Pluto (in yr) from knowledge of G, the mass of the sun (M = 1.99×1030 kg), and the orbital radius of Pluto of 3.96×101A.U. Given that the gravitational force is 5.64×1016 N
A spherical weather balloon os filled with Hydrogen until itsradius is 3m. Total mass including instruments is 15kg. Find buoyant force acting on the balloon
A roller coaster starts at a point 30 m above the bottom of a dipwith a speed of 25 m/s. Neglect friction, what will be the speed ofthe roller coaster at the top of the next slope, which is 45m above the bottom of the dip?
a photo of a swing ride at an amusement park. The structure consists of a horizontal, rotating, circular platform of diameter D from which seats of mass m are suspended at the end of massless chains of length d. What is the speed of each seat
at its highest temperature a space heater has a resistance of 19.5 u03a9 when it is plugged into a wall outlet
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