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A un automóvil de 15680 que se mueve a una velocidad de 20 m / s se le aplica una fuerza de 6,4 · 10 2N hasta que se Detiene. A.

sesenic [268]

Answer:

A) m = 1600 kg , B) p = 3.2 10⁴ kg m / s , C) Δp = - 3.2 10⁴ kg m / s

D) t = 51.6 s

Explanation:

A) They indicate the weight of the vehicle W = 15680 N

weight is the attraction of the earth on a body

W = m g

m = W / g

m = 15680 / 9.8

m = 1600 kg

B) The momentum is defined by

p = m v

p = 1600 20

p = 3.2 10⁴ kg m / s

C) the moment change is

Δp = p_{f} -p₀

as the vehicle stops the final speed is zero and therefore the moment is zero

ΔP = 0 - p₀

Δp = - 3.2 10⁴ kg m / s

D) Let's use Newton's second law

F = m a

a = F / m

a = 6.2 102/1600

a = 0.3875 m / s²

Now we can use kinematics, note that as the vehicle stops, the relationship must be opposite to the speed

v = v₀ - a t

v = 0

0 = v₀ - a t

t = v₀ / a

t = 20 / 0.3875

t = 51.6 s

3 0

3 years ago

the video discusses four potential models of how the expansion of the universe changes with time. drag the correct model descrip

lapo4ka [179]

Only the coasting model makes the assumption that the universe's expansion pace never changes.

The current expansion of the cosmos is predicted by all four hypotheses.

Only the recollapsing model foresees the eventual contraction of the universe.

The average mass density of the cosmos is predicted to be exactly the critical density only under the critical model.

The cosmos is only predicted to be expanding more quickly than it did in the distant past by the accelerating model.

Cosmologists use observations of radiation released soon after the Big Bang to determine the expansion rate, often known as the Hubble constant.

Since the unexpected finding that the universe's expansion is speeding up in 1998, cosmologists have incorporated repulsive dark energy into their theory of cosmic development. The Hubble constant's inconsistent values might be resolved by early dark energy, an additional amount of dark energy present in the early cosmos. This early dark energy would have accelerated the universe's expansion by exerting external pressure.

To learn more about Universe expansion please visit-
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8 0

2 years ago

A spaceship is moving past us at a speed close to the speed of light. how would we view time (clocks) on the spaceship as it goe

SVEN [57.7K]

The clocks on the spaceship move more slowly than ours do.

<h3>What use does a spaceship serve?</h3>

A spaceship is a machine or vehicle built to travel through space.

Spacecraft are a form of artificial satellite used for a wide range of tasks, such as communications, Earth observation, meteorology, navigation, space colonization, planetary exploration, and cargo and person transfer.

<h3>What is a spaceship used for?</h3>

A launch vehicle from Earth can launch a spaceship, which is made to go in space.

In order to complete a mission—with or without people—and then return to Earth, it may carry a payload. building up.

<h3>How many spacecraft have traveled there?</h3>

Since humankind first started exploring beyond Earth's atmosphere in 1958, more than 250 robotic spacecraft—and 24 humans—have traveled into space.

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8 0

2 years ago

What would be the magnitude of a

Pavlova-9 [17]

The magnitude of a velocity vector is 60 m/s.

To find the magnitude, the given values are,

x - components = 36 m/s

y - components = 48 m/s

<h3>What is magnitude?</h3>

The term magnitude can be defined as “ quantity ”.
For instance, the magnitude can be used for describing about the comparison of speeds.

It can also be used to explain the distance travelled by an object or to explain the amount of an object in terms of its magnitude.
Magnitude of the velocity vector is total value which is square root of the value.

The magnitude of the vector can be,

| a | = √ ( x² + y² )

Substituting the values of x component and y component given,

= √ ( 36² + 48² )

= √ ( 1296 + 2304)

= √ 3600

= 60 m/s

The magnitude is found to be 60 m/s.

Hence, Option B is the correct answer.

Learn more about magnitude,

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