What is the mass of the cup
A 100 g ice cube at -10° C is placed in an aluminum cup whose initial temperature is 70° C. The system comes to an equilibrium temperature of 20° C. What is the mass of the cup?
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A frictionless pulley in the shape of a solid cylinder of mass , M=3kg and radius R=0.4, is used to draw water from a well. A bucket of mass, m=2kg, is attached to a cord wrapped around the cylinddr. If the bucket starts from rest at the top of th
A spymaster has a network of 7 operatives whom he pays out of a slush fund containing $20000. For accounting reasons, his service requires him to use up his entire fund and to pay his operatives in integer multiples of $1000. How many different wa
You have a mechanism by which you can use a magnetic spectrograph to chose the energy of the beta rays from a 137Cs source. Your spectrograph only allows beta rays of 0.8 MeV to exit.
Determine in a steady state heat transfer through a 2.4in thick homogenous trapezodial flap with its faces maintained at temperature of 120oF and 70oF.
You are designing a remote-area power supply based on a miniature wind turbine that is 20% efficient. Meteorological data indicates an average wind speed of 24Km/h at an air temperature of 10 degree celcius and pressure of 0.9atm.
In how many different ways can the 4 computers be chosen? What is the probability that exactly one of the computers will be defective?
An ideal gas in a balloon is kept in thermal equilibrium with its constant temperature surroundings. How much work is done if the pressure is slowly reduced and the balloon expands to 5.0 times its original size?
Calculate the overall efficiency of the unit. Compare this to the efficiency of a Carnot cycle operating entirely inside the saturation dome, between the same maximum and minimum pressures. State why this Carnot cycle is not practical.
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When children are able to determine that the same amount of liquid is in two different sized containers, they have mastered
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The range of tasks that are too difficult for the child to master alone but that can be learned with the guidance and assistance of adults
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