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6 days ago

A bus took 8 hours to travel 639 km. For the first 5 hours, it

Physics

1 answer:

Sav [1K]6 days ago

6 0

Answer:

93 km/h

Explicación:

Sabiendo que un autobús tardó 8 horas en recorrer 639 km. En las primeras 5 horas, viajó a una velocidad promedio de 72 km/h.

Definamos la distancia recorrida en los primeros 5 horas como F

Aplicando la fórmula de velocidad,

Velocidad = distancia/ tiempo

72 = F/5

F = 72 × 5 = 360 km

La distancia restante será:

639 - 360 = 279km

El tiempo restante será:

8 - 5 = 3 horas

Velocidad = 279/3

Velocidad = 93 km/h

<pPor lo tanto, la velocidad promedio durante el tiempo restante del viaje es de 93 km/h

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In an amusement park rocket ride, cars are suspended from 3.40-m cables attached to rotating arms at a distance of 5.90 m from t

ValentinkaMS [1144]

Answer:

The rotational angular speed is measured at 1.34 rad/s.

Explanation:

Considering the following parameters,

Length = 3.40 m

Distance = 5.90 m

Angle = 45.0°

We are tasked with finding the angular speed of rotation

Using the balance equation

Horizontal component

$T\cos\theta=mg$

$T=\dfrac{mg}{\cos\theta}$

Vertical component

$T\sin\theta=m\omega^2 r$

Substituting the tension value

$mg\tan\theta=m\omega^2(d+L\sin\theta)$

$\omega=\sqrt{\dfrac{g\tan\theta}{(d+L\sin\theta)}}$

Substituting the value into the equation

$\omega=\sqrt{\dfrac{9.8\tan45.0}{5.90+3.40\sin45.0}}$

$\omega=1.34\ rad/s$

Thus, the angular speed of rotation computes to 1.34 rad/s.

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12 days ago

tas watches as his uncle changes a flat tire on a car. his uncle raises the car using a machine called a jack. each time his unc

Softa [913]

The answer is

-Small f and large D.

The explanation:

-A car jack acts as a machine, defined as an apparatus that aids individuals in exerting force more easily.

-Hence, by applying a small force to the jack, the height at which the car is elevated increases.

Machines are essential for people to amplify their strength; without them, lifting a car would be impossible.

Employing leverage or hydraulic principles, machines enhance your exerted force.

Utilizing a greater lever allows for extensive movement with minimal force, resulting in the opposite side moving shorter distances with an increased force.

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6 days ago

Read 2 more answers

Two planets having equal masses are in circular orbit around a star. Planet A has a smaller orbital radius than planet B. Which

serg [1189]

Answer:

Explanation:

To approach this problem, we need to understand two key concepts.

First, the gravitational force on an object in orbit equals its mass multiplied by centripetal acceleration.

Secondly, Newton's law of universal gravitation defines the force between two masses: Fg = mMG/r², where Fg denotes gravitational force, m and M signify the masses, G represents the gravitational constant, and r indicates the distance separating the two masses.

Thus:

Fg = m v²/r

mMG/r² = m v²/r

v² = MG/r

Potential energy for each planet is expressed as:

PE = mgr = m (MG/r²) r = mMG/r

Kinetic energy for each planet is computed as:

KE = 1/2 mv² = 1/2 m (MG/r) = 1/2 mMG/r

Total mechanical energy is calculated as:

ME = PE + KE = 3/2 mMG/r

Since both planets share the same mass, the only variable is their orbital radius. Consequently, Planet A, with a smaller radius, possesses greater potential, kinetic, and mechanical energy.

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13 days ago

Suppose you analyze standardized test results for a country and discover almost identical distributions of physics scores for fe

kicyunya [1011]

Answer:

consult a teacher

Explanation:

go to your school

locate the teacher

request assistance from him/her

complete the question and you're done:)

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