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Solnce55 [7]
3 years ago
5

Air conditioning and refrigeration reversible ratchet wrenches are used to ____. A. tighten hex head sheet metal screws B. tight

en flare nuts C. open and close refrigerant service valves D. tighten nuts that cannot be reached with other wrenches
Physics
2 answers:
wel3 years ago
4 0

Answer:

c

Explanation:

OPEN AND CLOSE REFRIGERATION VALVES

Maksim231197 [3]3 years ago
4 0

Answer:c

Explanation:

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Calculate the electric potential at point A, the middle of the rectangle, and at point B, the middle of the right-hand side of t
dsp73

Answer:

With the help of formula.

Explanation:

We can calculate the electric potential of any point through the formula of electric potential which is given below.

Electric potential =  Coulomb constant x charge/ distance of separation.

Symbolically it can be written as,  V = k q/ r where

V = electric potential  

k = Coulomb constant

q = charge

r = distance of separation

If we have all these data, we can simply put the data in the formula and we will get the value of electric potential.

5 0
3 years ago
How do you rationalize the tension being used in Tennis Racket strings using the concept of impulse and momentum?
zheka24 [161]

Answer:

The momentum, ΔP, and therefore, kinetic energy given to the ball in a serve is the result of the product of the tension force, 'F', in the string and the time of contact, Δt, between the ball and the string

ΔP = F × Δt

Explanation:

The impulse, ΔP, is the produce of the force, 'F', applied to a body for a given period of time, Δt', that gives motion to the body, and it is equal to the change of momentum of the body

ΔP = F × Δt

The momentum, 'P', of a body is the product of the mass, 'm', of the body and its velocity, 'v'

P = m × v

Tension is the axial pulling force of a string

T = Axial Force, F_{axial}

The tension used in Tennis Racket strings is between 40 to 65 lbs.

When high tension is used in the string, the string is taut, and the contact duration between the Racket string and the ball is minimal, and the player needs to use more force to obtain a high momentum, and therefore, energy in the ball, which reduces control, and increase stress, as force is more emphasized

When low tension is used in the string, the Tennis Racket strings are more elastic. During a serve, the ball pushes the strings further back into the racket, such that the ball spends more time in contact with the string, (Δt is larger), and therefore, the impulse, F·Δt = ΔP, given to the ball is larger, therefore, the ball has a larger change in momentum, and therefore more energy in the intended direction.

However, a very slackened string will increase the increase area and time (large Δt) of contact of the ball and the racket such that the force given to the ball, F = ΔP/(large Δt) is reduced and therefore reduce the likelihood of gaining points from a serve against an opponent with a much forceful return of a serve.

3 0
3 years ago
ANWER 3 QUESTIONS WITH THE CORRECT ANSWER 24 POINTS
steposvetlana [31]
15/ a
16/ b
17/ a

Hope this helps


4 0
3 years ago
Read 2 more answers
Which of the following corresponds to a supersonic speed? a) Mach0.5b) Mach 1.0 c) Mach 1.5
statuscvo [17]
B I'm pretty sure lol
5 0
3 years ago
Read 2 more answers
Q. A train accelerates from 36 km/h to 54 km/h in 10 sec. (i) Acceleration (ii) The distance travelled by car.
Brrunno [24]

u=10m/s

v=15m/s

acceleration=

v_u/ t

5/10

0.5

5 0
3 years ago
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