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In a die-casting operation 0.1 kg charges of molten zinc alloy at 410 degrees C are injected at a rate of 120 charges per hour. The liquid metal has a specific heat of 500 J kg-1 K-1 and a freezing temperature of 400 degrees C. The latent heat of solidification of the alloy is 2000 J kg-1. The casing is ejected from the die as soon as it is solid. The insulated die is water cooled at a rate C(Td-To), where Td is the die temperature, To = 20 degrees C is the ambient temperature and C has the value 1 J s-1K-1. Calculate the average die temperature after a long period of steady operation.
On December 3 at 11 pm you look toward the eastern horizon and see the bright star Procyon rising. At approximately what time would Procyon rise one week later, on December 9.
The sound level measured in the room by a person watching a movie in a home theatre system varies from 63 dB throughout a quiet part to 92 dB throughout a loud part. In the order of how many times louder is the latter sound.
How many revolutions does wheel make throughout the time
Discuss briefly centripetal acceleration, the speed and the force exerted by a ball attached to a string.
An airplane is flying with a velocity of 83.0 at an angle of 25.0 above the horizontal. When the plane is a distance 114 directly above a dog that is standing on level ground, the suitcase drops out of the luggage compartment.
Explain the spacing between allowed vibrational energy levels
Find out the magnitude of the electric field at a point P on the y-axis 0.529 m from the origin. The value of the Coulomb constant is 8.99 × 109 N • m2/C2.
In brief explain the changes that the Sun will go through after it exhausts its core hydrogen. Be sure to describe both the changes occurring in the Sun's core and the changes visible from outside the Sun. What do we mean by the stages we call hydrog..
Elucidate the spacing between peaks
Determine Maximum wavelength and Minimum wavelength. How various penguins of mass 16 kg each can stand on the ice block before they find their feet wet.
What is relative velocity
A 790-kg object and an 889-kg object are separated by 11.0 m. At what position (from the less massive object) can the 260-kg object be placed so as to experience a net force of 10 N towards the less massive object.
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