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Consider a 3-m x 3-m x 3-m cubical furnace whose top and side surfaces closely approximate black surfaces at a temperature of 1200 K. The base surface has an emissivity of e 0.7, and is maintained at 800 K. Determine the net rate of radiation heat transfer to the base surface from the top and side surfaces.
In a head-on collision, the car stops in 0.279 from a speed of 16. The driver has a mass of 68, and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his seat belt during that fraction of a second.
two identical capacitors store different amounts of energy capacitor a stores 1.4 x 10-3 j and capacitor b stores 4.7 x
Two foil balls are connected by a rod and suspended from a string. The connecting rod is mass less and insulated. What is the magnitude of the external torque
A machine part rotates at an angular speed of 0.60 rad/s; itsspeed is then increased to 2.2 rad/s at an angular acceletation of0.70 rad/s2
A mass of 20g is attached to a spring, and undergoes simple harmonic motion with a period of T=0.7 s. The total energy of the system is E=2.5 mJ. What is the force constant of the spring? What is the amplitude of the motion?
One end of an insulated metal rod is maintained at 100 , while the other end is maintained at 0 by an ice-water mixture. Find the thermal conductivity of the metal
The flywheel of an engine has a moment of inertia 2.20 {rm kg} cdot {rm m}^{2} about its rotation axis. What is its final kinetic energy.
A spherical hydrogen-filled balloon is used to lift a load of 5595 N (in addition to the weight of the hydrogen). Find the minimum necessary radius for the balloon
A sample of helium behaves as an ideal gas as it is heated atconstant pressure from 273 K to 343 K. what is the mass of helium present
How far does the car go before it stops. A car traveling at 50m/s runs out of gas while traveling up a 30 degree slope. how long will it travel before it rolls back down.
Electronics and inhabitants of the International Space Station generate a significant amount of thermal energy that the station must get rid of. How much power is radiated from each panel
A 0.60-kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 1.1m on a frictionless horizontal surface. If the cord will break when the tension in it exceeds 75N , what is the maximum speed the ball can have?
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