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4 years ago

Which of the atoms shown has an atomic number of 4?

Physics

2 answers:

Tatiana [17]4 years ago

4 0

Atomic number means the number of protons (p). So the answer is B) because the thats the only one with p = 4

ser-zykov [4K]4 years ago

3 0

Answer: B.

Explanation:

Atomic number of an atom is given by number of protons in the nucleus of the atom.

In a neutral atom, number of electrons = number of protons

option A- atom has 7 protons, thus atomic number is 7

option B- atom has 4 protons, thus atomic number is 4

option C- atom has 3 protons, thus atomic number is 3

Thus, B has atomic number 4. The element Beryllium has atomic number 4

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A 0.320 kg ball approaches a bat horizontally with a speed of 14.0 m/s and after getting hit by the bat, the ball moves in the o

katen-ka-za [31]

Answer:

Explanation:

Step one:

Given

mass m= 0.32kg

intital velocity, u= 14m/s

final velocity v= 22m/s

time= 0.06s

Step two:

Required

Force F

the expression for the force is

F=mΔv/t

F=0.32*(22-14)/0.06

F=(0.32*8)/0.06

F=2.56/0.06

F=42.67N

The average force exerted on the bat 42.67N

4 0

3 years ago

A CROW BAR WITH LENGTH 200 CM IS USED TO LIFT A LOAD OF 600N . IF THE DISTANCE BETWEEN FULCRUM AND LOAD IS 0.75. CALCULATE ; a,

matrenka [14]

Answer:

a. Effort = 960 Newton

b. Mechanical advantage (M.A) = 0.625

c. Velocity ratio (V.R) = 1.67

Explanation:

Given the following data;

Load = 600 N
Length of crowbar = 200 cm
Length of load arm = 0.75 m

Conversion:

100 cm = 1 m

X cm = 0.75 m

Cross-multiplying, we have;

X = 0.75 * 100 = 75 cm

First of all, we would find the effort arm;

Effort arm = length of crow bar - length of load arm

Effort arm = 200 - 75

Effort arm = 125 cm

Next, we would determine the mechanical advantage (M.A) of the crow bar;

$M.A = \frac {Effort \; arm}{Load \; arm}$

Substituting the values into the formula, we have;

$M.A = \frac {125}{200}$

M.A = 0.625

To find the effort of the crow bar;

$M.A = \frac {Load}{Effort}$

Making "effort" the subject of formula, we have;

$Effort = \frac {Load}{M.A}$

$Effort = \frac {600}{0.625}$

Effort = 960 Newton

Lastly, we would determine the velocity ratio (V.R);

$V.R = \frac {length \; of \; effort \; arm}{length \; of \; load \; arm}$

$V.R = \frac {125}{75}$

V.R = 1.67

6 0

3 years ago

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AleksandrR [38]

Answer:

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Explanation:

7 0

3 years ago

3. A child decides to keep his goldfish outside in a small bowl. He has to add water every day to keep

weeeeeb [17]

Humidity is 90 it will be hotter so the child has to add water to the goldfish bowl

5 0

4 years ago

There are 2.2 pounds in a kilogram. If a boy's mass is 40 kg, what is his weight in pounds?

kifflom [539]

Hey There! :)

$40*2.2$
$=88$

Hope this helps.
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3 0

4 years ago

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