2020 Mod 12 Flashcards
A man push is a stalled car for two minutes doing the first 1.5 minutes the car does not move but on the last 0.5 minutes the man push is even harder and sixes and getting the car to move. Describe if and when work is being done.
Work begins when the car we can still move during the last 0.5 minutes
Classify each of the following as either having potential or kinetic energy, or both
A gold bar
sunlight
an apple
a hurricane
Potential,
kinetic,
potential,
both (Because matter will always have potential energy)
A chemist what is the temperature of a vat of liquid analysis that increases over time. What can the chemist conclude from this observation
The liquid is gaining energy
If an object is totally insulated from the outside world totally unable to interact with anything else what temperature ever be able to change
No
What is experimental scatter
It is when the data points or a little above or a little below the excepted value because of the slight inconsistencies and inaccuracies in the measurements
Heat is added to two identical objects that are initially at the same temperature. If the first of the word 50.0 cal and the second absorbed 50.0 J, which will get hotter
50.0 cal
Some diet books say that an excellent way to lose weight is to drink ice-cold water why?
It is because the body will have to use energy to warm up the water
In a graph determined in heat, when the data points plateau at the highest point in the graph, what does that mean
That that the substance boils at
This is a big hit of aluminum Is roughly 2 times that iron. Equal masses of aluminum and iron start out at room temperature he is added to each mass at the same rate for the same amount of time. The iron the temperature increase by 900 degrees C. What was the temperature increase of the aluminum?
Because the specific heat of aluminum is so much higher it will only increase by half the amount ironed it so it will be 450° C
Why should a calorimeter always be made for an insulating material
So that the experience does not lose any energy when doing the experiment very flawed
What is the Definition of energy
Energy is the ability to do work
What is the definition of work
Work is the force applied to an object times the distance that the object travels parallel to that force
What is the definition of heat
Heat is the energy that is transferred as a consequence of temperature differences
What are flames?
Flames are a form of energy
The first law of thermodynamics
Energy cannot be created or destroyed it can only change forms
