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3 years ago

Suppose you have an atom composed of 19 protons, 20 neutrons and 19 electrons. what is the mass of this atom?

1 answer:

7 0

Mass = PROTONS + neutrons. So, 19 +20 = 39.
(Don't confuse yourself between electrons and protons when they are equal because it could be an ion)

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Density is the _____ of a certain ______

olga2289 [7]

I think the first blank is "solidity" and second is "object."

3 0

3 years ago

a. Ravi started colouring the fibres just after shearing. What is wrong in his process? Justify your ans

VARVARA [1.3K]

Answer:

mxfulxgiisditpdipstydlltdistpssipisup

Explanation:

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5 0

2 years ago

2. ATO kg bouting ball would require what force to accelerate down an alleyway at a rate of ons?

Mars2501 [29]

Answer:

2. 30N

3. 5,000N

4. 15 kg

5. 2,800 kg

Explanation:

2. A 10 kg bowling ball would require what force to accelerate down an alleyway at a rate of 3m/s² ?

Notice that I completed the question with the garbled and missing values:

Data:

F = ?

m = 10 kg

a = 3m/s²

Physical principles:

Newton's second law: $F=m\times a$

Solution:

Substitute and compute

$F=10kg\times 3m/s^2=30N$

3. Salty has a car that accelerates at 5 m/s². If the car has a mass of 1000 kg, how much force does the car produce?

Notice that I arranged the typos.

Data:

F = ?

m = ?

a = ?

Physical principles:

Newton's second law: $F=m\times a$

Solution:

Substitute and compute

$F=1,000kg\times5m/s^2=5,000N$

4. What is the mass of a falling rock if it produces a force of 147 N?

Data:

F = 147N

m = ?

a = falling rock

Physical principles:

neglecting air resistance ⇒ a = g: gravitational acceleration: 9.8m/s²

Newton's second law: $F=m\times a$

Solution:

Clear m from Newton's second law

$m=\dfrac{F}{a}$

Substitute with F = 147 N and a = g = 9.8m/s², and compute

$m=\dfrac{147N}{9.8m/s^2}=15Kg$

5. What is the mass of a truck if it produces a force of 14,000 N while accelerating at a rate of 5 m/s²?

Data:

F= 14,000N

m = ?

a = 5m/s²

Physical principles:

Second Newton's law: $F=m\times a$

Solution:

Clear m from Newton's second law

$m=\dfrac{F}{a}$

Substitute with F = 14,000 N and a = 5m/s², and compute

$m=\dfrac{14,000N}{5m/s^2}=2,800kg$

6 0

2 years ago

Se midió el pH de una muestra del agua de lluvia en la ciudad de México, y se obtuvo un valor de 3.5 Calcula la [H+] en dicha mu

aleksandrvk [35]

Answer:

$[H^+]=3.16x10^{-4}M$

Explanation:

¡Hola!

En este caso, dado que el pH de una solución se entiende como el potencial de los iones hidrógeno en la misma, es posible recordar la ecuación que se usa para calcularlo:

$pH=-log([H^+])$

De este modo, al conocer el pH, se resuelve para la concentración de iones hidrógeno como se muestra a continuación:

$[H^+]=10^{-pH}$

Así, reemplazamos el pH para obtener:

$[H^+]=10^{-3.5}=3.16x10^{-4}M$

¡Saludos!

5 0

2 years ago

Which statement describes the "Law of Conservation of Mass" for the following reaction?

TEA [102]

Answer:

Explanation:

7 0

2 years ago