Work /Energy/Power
What is the product of Force and Distance
Work
Why are snowshoes able to walk in snow
greater area=less pressure
If the upthrust acting a submerged object is greater than the object's weight then the object will
Float
What is 25oC in Kelvin?
25+273 = 298K
What is absolute zero measured in Celsius
-273.15 degrees Celsius
What is the rate of doing work
Power
What substances does pascals principle deal with
fluids
The volume of the object submerged is equal to
The volume of the fluid displaced
When considering the relationship between temperature and volume, what condition must be kept constant?
Pressure
Describe what happens to particles when the temperature increases
The spread apart and move faster
Why is an efficiency of one impossible?
Energy cannot be created
Formula for pressure in a fluid
P = pgh
State Archimedes Principle
An object that is partially or fully submerged in a fluid experiences an upthrust that is equal to the weight of the fluid displaced.
What is the formula for Charles's Law?
V1/T1=V2/T2
What is the specific Heat Capacity of a substance and the corresponding formula?
The amount of heat energy required to raise the temperature of 1 kg of a substance by 1K.
What energy transformations take place when a bird egg falls from a nest in a tree. (Ignore air resistance)
Potential Energy to Kinetic Energy
Water pressure ________________ with depth
Increases
The weight of an object lying on the sand is 28N. When the object is submerged in the sea its weight is 23N. What is the upthrust acting on the submerged object?
5N
Boyle’s law, stated mathematically is P1V1 = P2V2. According to this law, what is the relationship between pressure and volume?
As the pressure increases, the volume decreases.
What formula relates Heat Capacity to Specific Heat Capacity?
A 2,500 kg race car accelerates from rest to 35 m/s in 7.3 s. What is the power output of the engine?
209,760 W or 210 kW
Area of a bed of nails is 2m2 and the Pressure is 20Pa. How much force is applied.
40N
An object with a density of 0.6 g/cm3 is placed in water. The object weighs 4g and displaces water that weighs 5g. Does the object sink or float?
Float
Name at least one assumption,postulate of the kinetic-molecular theory
constant, rapid motion
no energy lost during collisions
kinetic energy related to temp.
molecules are very far apart
no attractive forces
Why does water's temperature increases faster than oil if the same amount of heat energy is added to both?
Water has a higher SHC