Answer:
C.O.P = 1.49
W = 335.57 joules
Explanation:
C.O.P = coefficient of performance = (benefit/cost) = Qc/W ...equ 1 where C.O.P is coefficient of performance, Qc is heat from cold reservoir, w is work done on refrigerator.
Qh = Qc + W...equ 2
W = Qh - Qc ...equ 3 where What is heat entering hot reservoir.
Substituting for W in equ 1
Qh/(Qh - Qc) = 1/((Qh /Qc) -1) ..equ 4
Since the second law states that entropy dumped into hot reservoir must be already as much as entropy absorbed from cold reservoir which gives us
(Qh/Th)>= (Qc/Tc)..equ 5
Cross multiple equ 5 to get
(Qh/Qc) = (Th/Tc)...equ 6
Sub equ 6 into equation 4
C.O.P = 1/((Th/Tc) -1)...equ7
Where Th is temp of hot reservoir = 493k and Tc is temp of cold reservoir = 295k
C.O.P = 1/((493/295) - 1)
C.O.P = 1.49
To solve for W= work done on every cycle
We substitute C.O.P into equ 1
Where Qc = 500 joules
1.49 = 500/W
W = 500/1.49
W = 335.57 joules
Hey! Since we got the mass of the basketball star as well as the acceleration. We can use Newton's Second Law to figure out the amount of force he is exerting.
F = ma
F = (120)(2.5)
F = 300N
Therefore, he is exerting 300N of force.
<h2>
Option D is the correct answer.</h2>
Explanation:
Here mechanical energy is conserved.
Kinetic energy + Potential energy = Constant.
First the child does 5.0 J of work on a spring while loading a ball into a spring-loaded toy gun.
That is potential energy = 5 J
Kinetic energy = 0 J
Kinetic energy + Potential energy = 0 + 5 = 5 J
Secondly the spring is released.
That is potential energy = 0 J
Kinetic energy = ?
Kinetic energy + Potential energy = Constant = 5 J
Kinetic energy + 0 = 5 J
Kinetic energy is 5 J
Option D is the correct answer.
Answer:
True.
Explanation:
A nutritionist must be licenced in order to be certified to practice in the United States.
Answer:
1.33
Explanation:
According to snell's law,
n = sin(a)/sin(b)
Given
a = 25.0°
b = 18.5°
Substitute
n = sin25/sin18.5
n = 0.4226/0.3173
n = 1.33
Hence the index of refraction nb for this type of glass is 1.33
