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Calculate the temperature at which a tungsten filament with an emissivity of 0.28 and a surface area of 7.6 × 10-5 m2 will radiate energy at the rate of 30 W in a room where the temperature is 24C. The Stephan-Boltzmann constant is 5.6696 × 10-8 W/m2· K4.
A particle whose mass is 2 kg moves in the xy plane with a constant speed of 3 m/s in the x-direction along the line y = 5. What is its angular momentum (in kg m2/s) relative to the origin
A baseball leaves the batter's bat at 30 degrees above horizontal. with what speed does the ball leave the bat
A string is wound around a metal wheel that is free to spin on a frictionless pivot. A hanging mass is connected to the other end of the string, What is the initial velocity of the hanging mass
q 1- how much pressure would be necessary to compress a quantity of mercury by 0.015 percent?2- two metal plates are
The 2.0 cm diameter coil shown below has 25 turns and has a current flowing through it of 5.00 A. What is the average change in flux (25 turns) going from 30 to 90 degrees
Brutus, a champion weightlifter, raises 240 kg of weights a distance of 2.70 m. How much work is done by Brutus lifting the weights
Find out the minimum values of m1 and m2 such that the overlapping of the bright fringes will occur and find position of the overlap on screen.
A heat engine with an efficiency of 35% performs 160j of work, how much heat is discharged to the lower temperature
A 120-V motor has mechanical power output of 3.20 hp. It is 91.0% efficient in converting power that it takes in by electrical transmission into mechanical power. Find the current in the motor
Dan is gliding on his skateboard at 2m/s. He suddenly jumps backward off the skateboard, kicking the skateboard forward at 7.00m/s (as measured by an observer on the ground). Dan's mass is 50 kg and the skateboard's mass is 5.00 kg.
The speed of a bullet as it travels down the barrel of a rifle toward the opening is given by v = (-5.30 107) t 2 + (3.15 105) t, where v is in meters per second and t is in seconds.
An ac generator emf is = m sin d t, with m = 26.4 V and d = 301 rad/s. It is connected to a 15.4 H inductor. What is the maximum value of the current
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