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sladkih [1.3K]
3 years ago
5

I tried but i don’t understand! please help asap!!!

Physics
1 answer:
Semmy [17]3 years ago
5 0

Answer:

~218 electrons

Explanation:

(-3.5 * 10^-17 C)/(-1.602 * 10^-19 C) = 3.5/1.602x10^-2 = 218.47...

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A bat, flying toward the east at 2.0 m/s, emits a shriek that is reflected back to it from a wall that is 20.0 m in front of the
faust18 [17]

Answer:

t = S / V     where S is distance sound travels and V the speed of sound

S = 20 + 20 - v t      where v is speed of bat and t time to hear echo

S = 40 - v t

t = (40 - S) / v = (40 - V t) / v      substituting S from 1st equation

v t + V t = 40

t = 40 / (v + V) = 40 / (340 + 2) = .117 sec = 117 ms

6 0
3 years ago
A scale reads 184 N when a piece of copper is hanging from it. What does it read (in N) when it is lowered so that the copper is
3241004551 [841]

Answer:

  163 N

Explanation:

The density of copper is about 8.96. The ratio of the weight in water to the weight in air is about 1-1/ρ, so is about 0.8884.

  0.8884 × 184 N ≈ 163 N

The submerged weight is about 163 N.

4 0
3 years ago
Describe an experiment to verify the principle of moments
Ludmilka [50]

The principle of moment can be verified when two known masses are suspended on a uniform meter rule.

<h3>What is principle of moment?</h3>

The principle of moment states that, the sum of clockwise moment is equal to the sum of the anticlockwise moment.

The principle of moment is verified when two known mass (m1 and m2) are suspended on a uniform meter rule.

The clockwise moment will be equal anticlockwise moment of the two masses.

(m_1g )r_1 = (m_2g)r_2

Thus, the principle of moment can be verified when two known masses are suspended on a uniform meter rule.

Learn more about principle of moment here: brainly.com/question/20298772

5 0
3 years ago
A very small round ball is located near a large solid sphere of uniform density. The force that the large sphere exerts on the b
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Answer:

Option e

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The Law of Universal Gravitation states that every point mass attracts every other point mass in the universe by a force pointing in a straight line between the centers-of-mass of both points, and this force is proportional to the masses of the objects and inversely proportional to their separation This attractive force always points inward, from one point to the other. The Law applies to all objects with masses, big or small. Two big objects can be considered as point-like masses, if the distance between them is very large compared to their sizes or if they are spherically symmetric. For these cases the mass of each object can be represented as a point mass located at its center-of-mass.

The same force is applied to both the balls.

5 0
3 years ago
All the forces acting on an object
Ne4ueva [31]
Opposite to gravity is the normal force. ... The normalforce<span> is always equal in magnitude and opposite in direction to gravity. An </span>object<span> may also have friction</span>acting<span> on it. Friction is a </span>force<span> that occurs when two</span>objects<span> rub against each other, restricting or preventing motion.</span>
8 0
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