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4 years ago

Which value would complete the last cell?

Physics

1 answer:

GREYUIT [131]4 years ago

5 0

Answer:

4.0

Explanation:

The following data were obtained from the question:

Force (F) = 20 N

Mass (m) = 5 kg

Acceleration (a) =.?

Force is simply defined as the product of mass and acceleration. Mathematically, it is expressed as

Force (F) = mass (m) x acceleration (a)

F = ma

With the above formula, we can obtain th acceleration of the body as follow:

Force (F) = 20 N

Mass (m) = 5 kg

Acceleration (a) =.?

F = ma

20 = 5 x a

Divide both side by 5

a = 20/5

a = 4 m/s²

Therefore, the value that will complete the last cell in the question above is 4.

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Which Of The Following Research Methods Are Widely Used By Psychologists?

goldenfox [79]

Answer: As you said D.

Explanation:

4 0

3 years ago

When point charges q = +8.4 uC and q2 = +5.6 uC are brought near each other, each experiences a repulsive force of magnitude 0.6

Bezzdna [24]

Answer:

Distance between the charges, r = 0.8 meters

Explanation:

Given that,

Charge 1, $q_1=+8.4\ \mu C=+8.4\times 10^{-6}\ C$

Charge 2, $q_2=+5.6\ \mu C=+5.6\times 10^{-6}\ C$

Repulsive force between charges, F = 0.66 N

Let r is the distance between charges. The formula for the electrostatic force is given by :

$F=k\dfrac{q_1q_2}{r^2}$

$r=\sqrt{\dfrac{kq_1q_2}{F}}$

$r=\sqrt{\dfrac{9\times 10^9\times 8.4\times 10^{-6}\times 5.6\times 10^{-6}}{0.66}}$

r = 0.8009 meters

r = 0.8 meters

So, the distance between the charges i 0.8 meters. Hence, this is the required solution.

4 0

3 years ago

a charge of 2 * 10^-9C is placed at the origin, and another charge of 4 * 10^-9C is placed at x = 1.5m. find the point between t

damaskus [11]

Answer:

x₁ = 0.62 m

Explanation:

In this exercise the force is electric, given by Coulomb's law

F = $k \frac{q_1q_2}{r^2}$

This force is a vector, since the three charges are in a line we can reduce the vector sum to a scalar sum.

For the sense of force let us use that charges of the same sign repel and charges of the opposite sign attract.

∑ F = F₁₂ - F₂₃

They ask us to find the point where the summaries of the force is zero.

F₁₂ - F₂₃ = 0

F₁₂ = F₂₃

let's fix a reference system located in the first charge (more to the left), the distance between the two charges is d = 1.5 m and x is the distance to the location of the second sphere

k q₁q₂ / x² = k q₂q₃ / (d-x) ²

q₁ (d-x) ² = q₃ x²

let's solve

d² - 2 x d + x² = $\frac{q_3}{q_1}$ x²

x² (1 - $\frac{q_3}{q_1}$ ) - 2x d + d² = 0

we substitute the values

x² (1- 4/2) - 2 1.5 x + 1.5² = 0

x² (-1) - 3.0 x + 2.25 = 0

x² + 3 x - 2.25 = 0

let's solve the quadratic equation

x = [-3 ± $\sqrt{ 3^2 + 4 \ 2.25}$ ] / 2

x = [-3 ± 4.24] / 2

x₁ = 0.62 m

x₂ = 3.62 m

since it indicates that the charge q₂ e places between the spheres, the correct solution is

x₁ = 0.62 m

7 0

3 years ago

A ball is thrown upward at 25 m/s from the ground. what is the balls velocity after 4 seconds?

mixas84 [53]

Answer:

-14.2m/s

Explanation:

Given parameters:

Initial velocity of the ball = 25m/s

Time = 4s

Unknown:

Final velocity of the ball = ?

Solution:

To solve this problem, we use the expression below;

v = u - gt

v is the final velocity

u is the initial velocity

g is the acceleration due to gravity

t is the time

v = 25 - (9.8 x 4) = -14.2m/s

5 0

3 years ago

A phosphorus atom needs to gain ---electrons to achieve a full octet

Readme [11.4K]

Answer:

Three (3).

Explanation:

The octet rule is a rule in chemistry that states that, chemical elements would either gain or loss electrons in their outermost shell in order to attain a stable electronic configuration i.e having eight (8) valence electrons in their outermost shell such as chemical elements found in group 8 (2-8-8) known as noble gas.

A phosphorus atom needs to gain three (3) electrons to achieve a full octet because the atomic number of phosphorus is 15 and as such it has the electronic configuration of 2-8-5 and needs three electron in order to become a stable element.

5 0

3 years ago