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PSYCHO15rus [73]
3 years ago
10

State two devices that transfer heat out of a cool environment into a warm environment​

Physics
1 answer:
Molodets [167]3 years ago
4 0

Answer:

Heat pump

Refrigerators

Explanation:

Some devices like heat pump and refrigerators used transfers of thermal energy in a cool region to warm other region.

These types of devices used for transferring heat energy by thermal conduction method.

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A 25 MGD surface water drinking plant has four circular clarifiers (aka sedimentation basin), operated in parallel with each bas
dangina [55]

Answer:

can y

Explanation:

jj

8 0
3 years ago
The ejection seat has an acceleration of 8gees (8xgravity or ~80m/s/s). He has a mass of 70kg. The total force on him from the c
Georgia [21]

I assume you're talking about a pilot. If the ejection seat has an acceleration of 8<em>g</em>, then it would exert a normal force of 8<em>g</em> (70 kg) ≈ 5600 N.

(This is assuming the pilot is flying horizontally at a constant speed, and the seat is ejected vertically upward.)

To reiterate, this is *only* the force exerted by the seat on the pilot. Contrast this with the <em>net</em> force on the pilot, which would be the normal force minus the pilot's weight, 5600 N - (70 kg)<em>g</em> ≈ 4900 N.

If instead the seat ejects the pilot directly downward, the force exerted by the seat would have the same magnitude of 5600 N, but its direction would be reversed to point downward, making it negative. But the <em>net</em> force would change to -5600 N - (70 kg)<em>g</em> ≈ -6300 N

5 0
3 years ago
A person who normally weighs 700 N is riding in an elevator that is moving upward but slowing down at a steady rate. If this per
xz_007 [3.2K]

Answer:

The scale will read less than 700 N

Explanation:

Given;

normal weight of the person, W = 700 N

The upward acceleration of the elevator is given by Newton's second law of motion;

F = ma

Also, the weight of the person, W = mg

Net force on the person when the elevator accelerates upward is given as;

R = ma + mg

When the elevator slows down at a steady rate, then net force on the person is given as;

R = mg - ma

R = m(g - a), this net force on the person is also the reading of the scale.

Thus, the scale will read less than 700 N.

8 0
3 years ago
What is the frequency corresponding to a period of 4.31 s? answer in units of hz?
yuradex [85]
0.23 Hz
Period being the reciprocal of frequency
5 0
3 years ago
A snowboarder starts from rest on an inclined planar snow surface and gives herself a tiny push to start sliding down the hill.
tiny-mole [99]

Answer:

v = 26.52 m/s

Explanation:

Here we know that as she passes the flag she will gain some speed

so here we can say that

Work done by all forces = change in kinetic energy of the system

so we will have

W_g + W_f = \frac{1}{2}mv_f^2 - \frac{1}{2}mv_i^2

here we know that

W_g = mgh

W_f = -\mu mg d

v_i = 0

h = 39.78 m

d = 27.81 m

so we have

mgh - \mu mg d = \frac{1}{2}mv^2 - 0

(9.8)(39.78 - (0.14)(27.81)) = \frac{1}{2} v^2

v = 26.52 m/s

8 0
3 years ago
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