Response:D
Clarification:
Provided
mass of object
Distance traveled
resulting velocity
energy conservation occurs starting when the object begins its descent and reaches a speed of 12 m/s
Initial Energy
Final Energy
where is the work done by friction, if any
As friction is present, this indicates an open system with a net external force of zero.
An open system allows for the exchange of energy and mass, and the presence of friction indicates that it is indeed an open system.
Answer:
$ 18.75
Explanation:
Given:
Dave's car has a capacity of 12 gallons.
If the tank is at 3/8 full prior to filling:
The cost of gasoline per gallon is $2.50.
The volume Dave needs to fill:
=
= of full tank
=
Dave must fill 7.5 gallons.
Total amount Dave will pay:
7.5 gallons x $2.50 =
$ 18.75
Thus, Dave will spend $ 18.75 to completely fill the tank.
Answer:
b. 9.5°C
Explanation:
= Ice mass = 50 g
= Initial temperature of water and aluminum = 30°C
= Latent heat of fusion =
= Water mass = 200 g
= Water's specific heat = 4186 J/kg⋅°C
= Aluminum mass = 80 g
= Aluminum's specific heat = 900 J/kg⋅°C
The equation governing heat exchange in the system is presented by
The final equilibrium temperature calculates to 9.50022°C
Answer:
Approximately, Hannah has completed 7 laps.
Solution:
Based on the provided details:
The complete distance to run, D = 5000 m
The distance for one lap, x = 400 m
Kara's time taken,
Hannah's time taken,
The speed for both Kara and Hannah can be determined as follows:
The time taken for each lap is represented by:
t = 500 s
Thus, the distance that Hannah covers in 't' seconds is given by:
The number of laps completed by Hannah when she overtakes Kara:
≈ 7 laps