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victus00 [196]
2 years ago
13

the difference between speed and velocity is that A) speed is a vector and requires a direction. B) speed is a vector and requir

es a magnitude. C) velocity is a vector and requires a direction. Eliminate D) velocity is a vector and requires a magnitude.

Physics
2 answers:
jenyasd209 [6]2 years ago
6 0

The correct answer is C. Velocity is a vector and requires a direction.

Explanation:

In physics both speed and velocity are used to study the motion of a body; however, they are slightly different. In the case of speed, this describes the rate of change in position based on distance and time, because of this, speed is based on a magnitude or quantity. On the other hand, velocity is a vector because it does not only includes a change of position but the direction of motion usually based on a specific location reference.

Considering this, it can be concluded the difference between speed and velocity is that "velocity is a vector and requires a direction" because velocity includes both the distance and time (speed) along with the direction while speed focuses only on time and distance.

sattari [20]2 years ago
6 0

The difference between speed and velocity is that C) velocity is a vector and requires a direction

<h3>Further explanation </h3>

Vector is a quantity that has a value and direction

Vector can be symbolized in the form of directed line segments

\large {\boxed {\bold {\overrightarrow{A}}}

while the length of the vector is denoted by | a |

Vectors can be written in the form of sequential pairs which shows their coordinates in the Cartesian plane: a (a₁, a₂)

with length

\large {\boxed {\bold {|a|=\sqrt{a_1^2+a_2^2}  }}

If the direction of the vector is reversed, we get the vector -a which has the same length but in the opposite direction

Operations on vectors include addition and subtraction. Addition of vector a and vector b can be done in a triangular way where the base point of vector b coincides with the endpoint of vector a

The sum of the two is obtained by pulling the line segment from the base point of the vector a to the endpoint of the vector b which results in a new vector c

So a + b = c

If vector a is added by inverse b (-b) then the sum becomes a + (- b) = a-b

If a vector is multiplied by a scalar number (eg denoted by k) then the new vector becomes k | a |.

If k> 0, the new vector is in the direction of vector a, but if k <0 it will be in the opposite direction

A vector has a direction and a magnitude, while a scalar has only a magnitude.

Examples of scalars are: length, mass, time, speed

Examples of vectors are: force, acceleration, velocity

<h3>Learn more </h3>

the average velocity

brainly.com/question/5248528

resultant velocity

brainly.com/question/4945130

the coin velocity

brainly.com/question/13103128

Keywords: vector, speed, velocity

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Answer:

A) V_air = 1.295 L

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Explanation:

A) Let;

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m_5 be the mass above the water with full lung

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Now, we are given;

m = 78.5 kg

m_3 = 3.2% × 78.5 = 2.512 kg

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Now, m_p = m_5 - m_3

m_p = 3.80725 - 2.512

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From archimedes principle, we have the formula for buoyant force as;

F_b = (m_displaced water)g = (ρ_water × V_air × g)

Where ρ_water is density of water = 1000 kg/m³

Thus;

F_b = w_p = 1.29525 × 9.81

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As earlier said,

F_b = (ρ_water × V_air × g)

Thus;

V_air = F_b/(ρ_water × × g)

V_air = 12.7064/(1000 × 9.81)

V_air = 1.295 × 10^(-3) m³

We want to convert to litres;

1 m³ = 1000 L

Thus;

V_air = 1.295 × 10^(-3) × 1000

V_air = 1.295 L

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