Virtual image formed by a convex mirror
A virtual image is formed by a convex mirror that has a 30 cm focal length. Where must the object be placed if the image size is to be half the size of the object? Verify with a ray diagram.
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A lead bullet with a mass of 0.02 kg traveling at 198 m/s strikes an armor plate and comes to a stop. If all the energy is converted to heat and absorbed by the bullet, what is the temperature change? You only need to enter the numeric part of you
1-kg of air at 200 kPa and 127 deg C is contained in a piston-cylinder device. Air is now allowed to expand in a reversible, isothermal process until its pressure is 100 kPa.
A mass-spring system oscillates on a horizontal frictionless surface with an amplitude of 3.24 cm. a) If the spring constant is 234 N/m and the mass is 0.580 kg, determine the mechanical energy of the system.
A balloon filled with helium, initially at 27 degree C and 1 bar. is released and rises in the atmosphere until the helium is at 17 degree C and 0.9 bar.
Determine: The mass of air in the room, in Ibm, The air temperature, in degree F, and pressure, in psia. after the fan has operated steadily for 30 minutes.
Using a 60 cm focal length converging lens, one wishes to obtain a virtual image which is four times as large as the object. Where must the object and image be?
Knowing that timber of 4-in. nominal width 93.5-in. actual width) with a 1.75-ksi allowable stress is to be used, determine the minimum required depth h of the beam.
Describe how the permittivity might change with time for a polymer material like the paint as it dries and explain how this measurement could be used to find when the paint was totally dry.
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