Draw a circuit of a kettle​

Answer:

The correct option is;

(c) 64W

Explanation:

Here we have the Coefficient Of Performance, COP given by

The heat change from 23° to 6°C for a mass of 10 kg/h which is equivalent to 10/(60×60) kg/s or 2.78 g/s we have

= m·c·ΔT = 2.78 × 4.18 × (23 - 6) = 197.39 J

Therefore, plugging in the value for   in the COP equation we get;

which gives

Since we were working with mass flow rate then the power input is the same as the work done per second and the power input to the refrigerator = 63.674 J/s ≈ 64 W.

The power input to the refrigerator is approximately 64 W.

Answer:

Win = 64 W ... Option C

Explanation:

Given:-

- The water is cooled in the refrigerator with delta temperature, ΔT=(23 - 6 )

- The flow rate of the refrigerated water is flow ( m ) = 10 kg/h

- The COP of the refrigerator is  = 3.1:

Find:-

the required power input to this refrigerator is

Solution:-

- The COP - The coefficient of performance of a refrigerator is a quantity that defines the efficiency of the system. The COP is given as:

                                COP = QL / Win

Where,

             QL : The rate of heat loss

             Win : The input power required

- The rate of heat loss can be determined from first law of thermodynamics.

                               Qin - Wout = flow (m)*c*ΔT

Where,

               Qin = - QL ... Heat lost.

               c : The heat capacity of water = 4,200 J / kg°C

- There is no work being done on the system so, Wout = 0

                              -QL = flow (m)*c*ΔT

                              -QL = ( 10 / 3600 )*4200*( 6 - 23 )

                               QL = 198.33 W

- The required power input ( Qin ) would be:

                              Win = QL / COP

                               Win = 198.33 / 3.1

                                      = 63.97 W ≈ 64 W

We have that From the Question a ball is thrown straight up. At the top of its path its acceleration is

0 m/s2.

Option A

From the question we are told  

A ball is thrown straight up. At the top of its path its acceleration is

a. 0 m/s2.

b. about 5 m/s2.

c. about 10 m/s2.

d. about 20 m/s2.

E. about 50 m/s2.

Generally

For a Ball thrown straight up at the top of its path where The gravitational force equals the force of the thrown,the Point where the ball is at equilibrium  the Velocity of the ball is zero

Therefore

From the Question

A ball is thrown straight up. At the top of its path its acceleration is

a. 0 m/s2.

Option A

For more information on this visit

brainly.com/question/21811998

Explanation:

First of all, let's try to identify the different substances involved in the reaction:

- calcium hydroxide: calcium is the element , while hydroxide corresponds to the ion . Calcium has 2 valence electrons, so the calcium ion is , and since the ion has only one negative charge, we need two of them to combine with the calcium ion, therefore:

- hydrochloric acid: this is an acid, so with one ion of hydrogen , and the other element is the chlorine, which in the ion form is , so the hydrochloric acid is

- calcium chloride: this is the combination of the calcium ion, , with the chlorine ion, , so the compound is

- Water: this is given by

so, the reaction is

However, this reaction is not balanced yet: in fact, we have 2 atoms of oxygen on the left and only one on the right. Moreover, we have 3 atoms of hydrogen on the left and only 2 on the right. Therefore, in order to balance it, we must write:

D) Ca(OH)2(s) + 2HCI(l) -> CaCl2(aq) + 2H2O(l)

Answer:

Mercury,Venus,Earth and Mars

Explanation: