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ValentinkaMS [17]
2 years ago
6

Help me pleaseee and answer correctly!!!!!

Physics
2 answers:
Sever21 [200]2 years ago
8 0

Answer:

Two nuclei with identical chromosomes (C)

Explanation:

You can hit me later if I'm wrong but I'm quite sure

Dmitrij [34]2 years ago
4 0
The answer is C good luck with the answer
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1.) When the acceleration is zero, what can you say about the velocity of an object?
Paraphin [41]

Answer:

it is either constant or zero

Explanation:

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2 years ago
Which situation is work not being done? A) A bookcase is slid across carpeting. B) A stack of books is carried at waist level ac
Nastasia [14]

Answer:

B) A stack of books is carried at waist level across a room

Explanation:

Work is defined as:

W=Fd cos \theta

where

F is the force applied

d is the displacement of the object

\theta is the angle between the direction of the force and of the displacement

From the formula, we see that the work done is zero when the force and the displacement are perpendicular to each other. Let's now analyze each situation:

A) A bookcase is slid across carpeting. --> work is done, because the force that pushes the bookcase is in the same direction of the displacement

B) A stack of books is carried at waist level across a room. --> no work is done, because the force to carry the book is vertical, while the displacement of the books is horizontal

C) A chair is lifted vertically with respect to the floor. --> work is done, because the force that lifts the chair is vertical, and the displacement is vertical as well

D) A table is dropped onto the ground. --> work is done, because the force of gravity (that makes the table falling down) is vertical and the displacement of the table is also vertical.

5 0
3 years ago
Please help!!................
Gnoma [55]

D. When a substance reacts with another substance, it shows its chemical property

3 0
3 years ago
Cooling systems, such as air conditioners and refrigerators, transfer thermal energy in order to keep homes and cars cool or to
Lubov Fominskaja [6]

Answer: I think maybe thru Convection?

Explanation:

cause convection causes the heat to stay to the top and the cold air stay's to the bottom so maybe i would say Convection.... Is there any answer choices?

8 0
3 years ago
A heat pump has a coefficient of performance of 4. if the heat pump absorbs 20 cal of heat from the cold outdoors per cycle, how
Lubov Fominskaja [6]
A heat pump has a coefficient of performance of 7.05. If the heat pump absorbs 20 cal of heat from the cold outdoors in each cycle, find the heat expelled to the warm indoors. Answer in units of cal. I believe COP (heating mode) : 7.05 and COP = Qh/W Qc = 20 cal so I have to find Qh= ? cal I dont know an equation to put all this together? Please help, thank you.

5 0
3 years ago
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