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The emissivity of non-polished gold is about 0.47. Suppose a non-polished solid golden sphere has a radius of 0.2 m and is at a temperature of 158oF. If this sphere is placed in a room in which the temperature is 68oF, determine the rate in which heat is leaving the sphere (due to radiation) into the room.
(a) 56.8 W
(b) 66.8 W
(c) 76.8 W
(d) 86.8 W
(e) 96.8 W
(f) None of the above.
high-frequency sound waves exhibit less diffraction than low-frequency sound waves do. Determine the angle that locates the first minimum to either side of the central maximum in the diffraction pattern for the sound
A ball is thrown vertically upward with a speed of 15.0 m/s. How long does it take to reach its highest point
A container at 25°C holds 0.50 moles of helium at a pressure of 2.5 atm. What is the volume of the container
In a science fiction novel , a starship takes 3 days to travelbetween two distant space stations according to its own clocks. How fast did the starship travel, relative to the spacestation
A 1200 kg boat is traveling at 80 km/h when its engine is shut off. The magnitude of the frictional force fk between boat, Find the time required for the boat to slow down to 40 km/h
What is the apparent weight of a 75 kg astronaut.
A 75 kg ladder that is 3.0 m in length is placed against a wall at an angle theta. The center of gravity of the ladder is at a point 1.2 m from the base of the ladder. find the static frictional force between the floor and the ladder
Measurements of the radioactivity of a certain isotope tellyou that the decay rate decreases from 8355 to 3160 over a period of 4.50 What is the half-life of this isotope
To see that it is easy to break a thighbone when falling in this fashion, find out the greatest distance through which his center of gravity can fall without his breaking a bone.
An elastic cord is 69 cm long when a weight of 57 N hangs from it but is 70 cm long when the weight of 75 N hangs from it. What is the "spring" constant k of this elastic cord.
A 120g ball moving at 0.50 m/s in the + x direction is subject to a 0.25 N force in the - y direction for 2.5 s, Find the balls final speed
A high diver leaves the end of a 5.0 m high diving board and strikes the water 1.4 s later, 2.6 m beyond the end of the board. determine the maximum height (in meters) above the water reached
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