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Sergeeva-Olga [200]
2 years ago
5

True or False? 13. All living things are made of cells 14. All cells have DNA within their nucleus 15. The cell is the basic uni

t of life in all organisms 16. All cells in a living thing are similar in structure or function 17. Cells must develop from other cells
Physics
1 answer:
Leni [432]2 years ago
3 0

Answer:

1: True

2: False

3: True

4: False

5: True

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A 460 W heating unit is designed to operate with an applied potential difference of 120 V (a) By what percentage will its heat o
dybincka [34]

Answer:

(a) = -0.16%

(b) = smaller

Explanation:

given

power = 460 W

potential difference = 120 V

(a) what percentage will   its heat output drop if the applied potential difference drops to 110 V ?

we know p = \frac{v^2}{R} .....................(i)

we need to find change in power

\Delta P = \frac{\Delta (V^2)}{R}  

\Delta P = \frac{2 V \Delta V}{R}..............(ii)

from equations we get

\frac{\Delta P}{P} =  \frac{2 \Delta V}{V}

\frac{\Delta P}{P} = 2 \frac{110 -120}{120}

\frac{\Delta P}{P} =  -2(\frac{10}{120})

\frac{\Delta P}{P} = - 0.16 %

(b)

if we increase temperature resistance will increase and decrease with decrease in temperature and we know power is inversely proportional to resistance so if potential decrease and it would cause drop in power

and due to this increment of heating power resistance will decrease so actual drop in the power would  be smaller

7 0
3 years ago
7. Sally's mass on Earth is 50 kg. What is her weight on the moon?
Makovka662 [10]

Answer:

82.6

Explanation:

7 0
2 years ago
What are the factors of weight
Tatiana [17]
The answer to your question is body weight,<span> </span>body heat and muscle mass<span>.
Hoped I Helped!</span>
5 0
3 years ago
Forces that are unequal in size but opposite in direction will cause movement.
Oksi-84 [34.3K]

Answer:

true

Explanation:

if they were balance then it would not move

8 0
3 years ago
Which factors affect the gravitational force between objects? Check all that apply
neonofarm [45]

Answer:distance between objects and the masses of the objects

Explanation:

Gravitational force of attraction between two masses is directly proportional to the product of the masses and inversely proportional to the square of distance apart

5 0
3 years ago
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