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Angelina_Jolie [31]
3 years ago
6

What is an electric current?

Physics
1 answer:
erik [133]3 years ago
7 0

Answer:

c

Explanation:

mark brainleyest plz if right

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A boy starts from point A and walks 3 meters toward the south, then turns around and walks 7 meters toward the north. What is th
jolli1 [7]

Answer:

-3m+7m =  4m

Explanation:

As he walks south, he is going down 3m (-3m). Then he walks up 7m (+7m).

You subtract the final position from the initial position to get displacement.

7m - 3m = 4m

7 0
3 years ago
A force of 9.00 newtons acts at an angle of 19.0° to the horizontal. What is its component in the horizontal direction?
g100num [7]
It would be helpful if you draw the figure of the problem. You will see that a right triangle would be constructed by the problem where 19.0 is the angle between the hypotenuse and the base of the triangle. It is said that the force acting is said to be 9.0 N  at the said angle to the horizontal. Using trigonometric relations,

cos 19 = adjacent / hypotenuse = horizontal component / 9
horizontal component = 8.51 N
5 0
3 years ago
Read 2 more answers
What is a possible explanation for a set of facts that can be tested by further investigation called
Amanda [17]

Answer:

A hypothesis

Explanation:

A hypothesis is an explanation for those facts and can expierimented on.

5 0
3 years ago
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The radioactive element polonium decays according to the law given below where Q0 is the initial amount and the time t is measur
kogti [31]

Answer:

1280 mg

Explanation:

Radioactive  decay is a phenomenon that occurs when a certain isotope of an element, said to be radioactive, decays, turning into a lighter nucleus and emitting radiation + energy in the process.

The radioactive decay of this isotope of polonium is described by the equation

Q(t)=Q_0 2^{-\frac{t}{140}}

where

Q(t) is the amount of polonium left after time t

Q_0 is the amount of polonium t time t = 0

140 is the half-life of the polonium, in days (it is the time it takes for the initial element to halve its amount)

IN this problem, we know that:

After t = 560 days, the amount of polonium left is Q(t)=80 mg. Therefore, we can re-arrange the equation, substituting t = 560 d, and solve for Q_0 to find the initial amount of polonium:

Q_0 = Q(t) \cdot 2^{\frac{t}{140}}=(80)\cdot 2^{\frac{560}{140}}=1280 mg

5 0
4 years ago
A construction worker drops a hammer from a 15 m high building. How fast is it going before it hits the ground?
Nuetrik [128]

Answer:

12.1 m/s

Explanation:

v^2-u^2=2as

v^2-0=g(15)

5 0
3 years ago
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