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You make tea with 0.375 kg of 94.6°C water and let it cool to room temperature (20.0°C) before drinking it.(a) Calculate the entropy change of the water while it cools.J/K(b) The cooling process is essentially isothermal for the air in your kitchen. Calculate the change in entropy of the air while the tea cools, assuming that all the heat lost by the water goes into the air.J/KWhat is the total entropy change of the system tea + air?J/K
An electric dipole is formed from +/-4.0 nC point charges spaced 3mm apart. The dipole is cantered at the origin, oriented along the y-axis. What is an electric field strength at point (x,y) = ( 6.0 cm, 0 cm)
A Carnot engine absorbs 950J of heat each cycle and provides 340J of work. How much heat is rejected each cycle
Element X decays to element Y with a half-life of 0.77 s. Initially there is a sample of pure X and after 2.31 s there are 7g of Y. What was the mass of the original sample
Two electrons are fixed 2.1 cm apart. Another electron is shot from infinity and comes to rest midway between the two. What was its initial speed
Two point charges have a value of 30 ?C each and are 4 cm apart. What is electric field at the midpoint between the two charges
A raft is made out of 10 logs that are 56cm in diameter and are 6.1m long. How many people (68kg each) can stand on the raft with out getting there feet wet
When a 19.7 kg wheel with an angular speed of 2.30 rad/s is disconnected from a motor, a 0.219 N · m frictional torque slows the wheel to a stop. how long will it take for the wheel to come to rest
Catapult fires an 800-kg rock with an initial velocity of 100 m/sat a 40° angle from ground. What is the magnitude of the horizontal impulse
Objects with masses of 210 kg and a 510 kg are separated by 0.300 m. Find the net gravitational force exerted by these objects on a 31.0-kg object placed midway between them
a high speed cooling fan has a maximum angular speed of 15.0 rad/sec, calculate the angular acceleration when the device goes from idle speed to operational speed
A cube of wood having an edge dimension of 20.3 cm and a density of 647 kg/m3 floats on water. What is the distance from the horizontal top surface of the cube to the water level?
An ?-particle has a charge of +2e and a mass of 6.64 10-27 kg. It is accelerated from rest through a potential difference that has a value of 1.38 106 V, What is the speed of the ?-particle
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