You place a cup of 205of coffee on a table in a room that is 72of, and 10 minutes later, it is 195of. approximately how long will it be before the coffee is 180of? use newton's law of cooling: \[t(t)=t _{a}+(t _{o}-t _{a})e ^{-kt}\]
a. 15 minutes
b. 25 minutes
c. 1 hour
d. 45 minutes
Answers: 3
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Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)
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Abicycle slows down when the rider applies the brakes. what type of energy transformation is involved in this example? a. kinetic energy into heat energy b. heat energy into potential energy c. potential energy into kinetic energy d. kinetic energy into mechanical energy
Answers: 1
You place a cup of 205of coffee on a table in a room that is 72of, and 10 minutes later, it is 195of...
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