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3 years ago

Which of the following statements is true regarding the use of refrigerants?

Physics

2 answers:

Damm [24]3 years ago

5 0

B.

Refrigerants should be handled using approved equipment only.

Mandarinka [93]3 years ago

4 0

<h2>Use of Refrigerant - Option B </h2>

Recover and recycle refrigerant using epa-approved equipment. Refrigerants must be examined by utilizing just guaranteed material. A refrigerant is a thing or blend which is generally a liquid that utilized in a warmth pump and preservation period.

In most periods, it supports phase transformations from a liquid to a gas and repeated. Several moving liquids have been utilized for such goals.

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What is the total resistance in the circuit? (include unit in answer - ohms)

solmaris [256]

Answer:60 ohms

Explanation:

R1=30 ohms

R2=15 ohms

R3=15 ohms

Let the total resistance be R

R=R1 + R2 + R3

R=30 + 15 +15

R=60

Total resistance is 60 ohms

4 0

3 years ago

A 49 kg bear slides, from rest, 11 m down a lodgepole pine tree, moving with a speed of 3.3 m/s just before hitting the ground.

hichkok12 [17]

Answer:

a) $\Delta U_g=-5.3kJ$

b) $K=0.27kJ$

c) $F_f=0.45kN$

Explanation:

the gravitational potential energy is given by:

$U_g=m.g.h\\$

$\Delta U_g=m.g.h_f-m.g.h_i\\\Delta U_g=49kg*9.8m/s^2*(0m-11m)\\\Delta U_g=-5.3kJ$

The kinetic energy is given by:

$K=\frac{1}{2}m.v^2\\$

the initial kinetic energy is zero because the motion started from rest, so:

$K=\frac{1}{2}*49kg*(3.3m/s^2)^2\\K=0.27kJ$

applying the conservation of energy theorem:

$U_g-W_f=K_f\\W_f=-(\Delta K+\Delta U)\\W_F=5.3kJ-0.27kJ\\W_F=-5.0kJ$

The work done by the friction force is given by:

$W_f=F_f.h.cos(\theta)\\$

the angle of the force is 180 degrees because it's against the movement:

$F_f=\frac{W_f}{h.cos(\theta)}\\\\F_f=\frac{-5.0kJ}{11m.cos(180^o)}\\\\F_f=0.45kN$

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4 years ago

In and electric circuit, where do the electrons come from that flow in the circuit

Firdavs [7]

The electrons are already there. They are freely moving through the conductor.

7 0

3 years ago

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Aliun [14]

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3 years ago

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What is the kinetic energy of a baseball with a mass of 0.133 kg and moving at a speed of 28.7m/s

blsea [12.9K]

Answer:

54.7 J

Explanation:

kinetic energy formula

3 0

3 years ago