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enot [183]
3 years ago
9

How should Sal correct his diagram?

Physics
2 answers:
finlep [7]3 years ago
5 0

Answer: it's c

Explanation:

Delicious77 [7]3 years ago
3 0

Since Sal drew the electron dot diagram of an aluminum atom, Sal should;

C. He should add a single dot below the symbol.

You might be interested in
How is the mass number calculated for an element?
natali 33 [55]
<span># of protons + # of neutrons = atomic mass</span>
8 0
4 years ago
A length of copper wire has a resistance 29 Ω. The wire is cut into three pieces of equal length, which are then connected as pa
erik [133]

Answer:

3.222 ohms

Explanation:

If the total wire had a resistance of 29 ohms, when cut in three, each piece will have a resistance of 9.666 ohms.

As these three pieces (R1, R2 and R3) are now connected in parallel, the equivalent resistance R can be calculated using this equation:

1/R = 1/R1 + 1/R2 + 1/R3

1/R = 1/9.666 + 1/9.666 + 1/9.666

1/R = 3/9.666

R = 9.666/3 = 3.222 ohms

The resistance between A and B will be 3.222 ohms

6 0
3 years ago
A 770 n man stands in the middle of a frozen pond of radius 10.0 m. he is unable to get to the other side because of a lack of f
oksano4ka [1.4K]
Momentum is conserved throughout this scenario.

Before the man does anything, the total momentum of him and his book is zero.  So we know that it'll be zero after he throws the book.

Momentum = (mass) x (velocity)

The man gives the book (1.2 kg)x(10 m/s north) = 12 kg-m/s north
of momentum.

Since the total momentum must be zero, the man himself picks up 120 kg-m/s of momentum south.

(his mass)x(his v) = 120 kg-m/s south = (770 kg-m/s^2/9.8 m/s^2)x(V).

His velocity southward = (120 x 9.8) / (770)    m/s .

He needs to reach the shore 10m away.

Time = distance/speed

        =  (10 x 770) / (120 x 9.8) seconds

        =  6.55 seconds 


3 0
3 years ago
In order to cool 1 ton of water at 20°C in an insulated tank, a person pours 140 kg of ice at –5°C into the water. The specific
salantis [7]

Answer:

T = 6.31 ^0 C

Explanation:

1 ton = 907.2 kg

so here heat given by water = heat absorbed by the ice

so by energy balance we will have

Q_1 = Q_2

mL + ms\Delta T_1 + ms\Delta T_2 = ms\Delta T_3

so we have

140(2.11)(5) + 140(333.7) + 140(4.18)(T) = 907.2(4.18)(20 - T)

48195 + 585.2 T = 75841.9 - 3792.1 T

T = \frac{27646.92}{4377.3}

T = 6.31 ^0 C

7 0
3 years ago
Why does the velocity change when the boy hits the ball
juin [17]

Answer:

Freefall is a special case of motion with constant acceleration because acceleration due to gravity is always constant and downward. This is true even when an object is thrown upward or has zero velocity.

When a ball is thrown up in the air, its velocity is initially upward. Since gravity pulls the object toward the earth with a constant acceleration g, the magnitude of velocity decreases as the ball approaches maximum height. At the highest point in its route, the ball has zero velocity, and the magnitude of velocity increases again as the ball falls back toward the earth.

4 0
3 years ago
Read 2 more answers
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