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Arada [10]
3 years ago
8

The mass of an object is 18g and its volume is 9 cm3

Physics
1 answer:
serg [7]3 years ago
5 0
Density = 2 g/cm ^3 (if that’s the question)
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You are at a friend’s house and they show you a magic trick. The balloon when brought near tiny pieces of paper is making the li
andrew11 [14]

Answer:

Static electricity.

Explanation:

Electric Charge; Is the quantity of electricity held in an object

The balloon is electrically neutral, meaning it had an equal amount of positive and negative charges hence it couldn't attract the paper.  

After rubbing the balloon, it gained an electric charge; and after gaining this charge it got the ability to exert a force on the pieces of paper and attract them, This is called static electricity.

Therefore, Static electricity caused the paper to stick to the balloon.  

5 0
3 years ago
True or False. Alfred Wegener contributed greatly to the theory of plate tectonics by collecting and analyzing fossil, glacial a
bearhunter [10]

Answer:

The Answer would be True

Explanation:

8 0
2 years ago
Read 2 more answers
ASAP pls answer right and I will mark brainiest
Ronch [10]
1. D:Asteroids have geological activity
2.A:Short-period comets circle around the sun in 200 years or less and originate in the Kuiper Belt
3.D:All of the above
4.A:It’s gravity is too weak to clear it’s orbit
5.B:Ceres
6.C:Haumea
7.A:Is bigger than Pluto

I hope this helps
6 0
3 years ago
A metallic wire has a diameter of 4.12mm. when the current in the wire is 8.00a, the drift velocity is 5.40×10−5m/s.
Darina [25.2K]
R = 2.06 mm = 2.06 x 10^(-3) m
Q = 1.6 x 10^(-19) C
v = 2.5 x 10^(-5) m/s
I = 8 A = 8 C/s
A = r² π = ( 2.06 x 10^(-3) ) ² x 3.14 = 13.325 x 10^(-6 ) m² =
= 1.3325 x 10^(-5) m²
I = n Q v A
n = I / (Q v A)
n = 8 C/s / ( 1.6 x 10 ^(-19) * 5.4 x 10^(-5) * 1.3325 x 10^(-5) ) = 
= 0.694 x 10^(29) m^(-3)
n = 6.94  x 10^(28)   m^(-3)
8 0
3 years ago
Read 2 more answers
In which of these cases do we have enough information to say that the atom is electrically neutral?
Luba_88 [7]
<span>So we want to know when do we have enough information about the atom that we can say that it is electrically neutral. So the information we need to know is the number of protons, whic are positively charged particles and the number of electrons which are negatively charged particles. Number of protons has to be equal to number of electrons for the atom to have neutral charge. Neutrons are electrically neutral so their number doesn't change the charge of the atom. So the correct answer is B. </span>
5 0
3 years ago
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