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An aluminum tray used for making ice cubes is filled with water and placed in a freezer at -19.8° C. The emissivity of the aluminum is close to zero, but the emissivity of water or ice is 0.950. The exposed top surface area of each ice cube is 20.8 cm2.
(a) Find the rate at which heat is removed from an ice cube by radiation just as the water begins to freeze.
(b) How long would it take for radiation alone to remove enough heat to freeze the ice cubes if each has a mass of 75.2 g?
An athlete whirls a 7.49 kg hammer tied to the end of a 1.3 m chain in a horizontal circle. What is the centripetal acceleration of the hammer
An L-R-C circuit, operating at 60 Hz , has an inductor with an inductance of 1.53x10^-3 H , What is the inductive reactance of this circuit
An ideal monatomic gas is the working substance of a Carnot engine. During the isothermal expansion the volume doubles. Compute the temperature of the reservoirs between which the engine operates
A 5.0 X 10^4-kg space probe is traveling at a speed of 11,000m/s through deep space. What is the final speed of the probe
A 2.90 kg lump of aluminum isheated to 92.0°C and then dropped into 7.30 kg of water at 5.00°C. what is the system's final(equilibrium) temperature
Water Vapor at 10 MPa, 600 C enters a turbine operating at steady state with a volumetric flow rate of .36 m^3 and exits at .1 bar and a quality of 92%. determine the rate at which entropy is produced
A satellites are placed in a circular orbit that is 3.64 × 107 m above the surface of the earth. What is the magnitude of the acceleration due to gravity at this distance
Compute the voltage drop along a 28 m length of household no. 14 copper wire (used in 15 A circuits). The wire has diameter 1.628 mm and carries a 14 A current
In 1994, Mata Jagdamba of India had very long hair. It was 4.23 m long. Suppose Mata conducted experiments with her hair. how large was the mass
Joey, whose mass is 39kg, stands at rest at the outer edge of the frictionless 230kg merry-go-round, 2.2m from its center. What is the final angular speed of the merry-go-round
the radii of curvature of the surfaces of a thin converging meniscus lens are r1 12.0 cm and r2 28.0 cm. the index
A worker on top of a radar tower 22.4 ft high drops a wrench off the tower. What is the speed of the wrench when it hits the ground
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