Answer: Photoelectric wave
Explanation: Because it represents an interaction between light and matter that describes light as an electromagnetic wave.
Answer:
Part A: D
Part B: W = Qh - Qc
Part C: e = 1 - Qc/Qh
Explanation:
The heat engine is the engine that transforms heat (Q) in work (W), and by the second law of the thermodynamics, its efficiency can not be 100%, it means that some heat must be dissipated.
Part A:
The engine works with two sources of heat, one hot (Qh) at a hot temperature (Th) and another cold (Qc) at a cold temperature (Tc). It is necessary so, the hot source will give energy to the fluid of the engine, and the cold source will be the source where these heat will dissipate and the fluid will return to its original temperature. So,
Qh > Qc, and Th > Tc
Part B:
The ideal heat engine is the one that can use the most amount of heat to transform it at work. It is characterized by Qh/Qc = Th/Tc.
The work is the useful energy, so it is the total heat (Qh) less the heat dissipated (Qc):
W = Qh - Qc
Part C:
The effiency is the useful energy divided by the total energy. Because W = Qh - Qc:
e = W/Qh
e = (Qh - Qc)/Qh
e = Qh/Qh - Qc/Qh
e = 1 - Qc/Qh
Given data:
* The acceleration of the runner is,
* The initial velocity of the runner is,
* The time given is,
Solution:
By the kinematics equation, the final velocity of the runner is,
where v is the final velocity,
Substituting the known values,
Thus, the final velocity of the runner is 30.67 m/s.
Answer:
Given: Initial Velocity:0
Velocity: 25 m/s
Time :10 sec.
Acclereation?.
Use formula for acceleration,
Divide units to
So our acceleration is
If you want to, you can use kinematic equation
vi is inital velocity, since v1=0 we just have
Which is the same as first step, so we would get 2.5 m/s^2