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andrey2020 [161]
3 years ago
15

A 1110 kg car moving at 21 m/s East is struck by a truck traveling West. The truck's impact exerts a force of -8000 kg•m/s2 for

0.90 seconds. Calculate the car's final velocity.
Physics
1 answer:
andrey2020 [161]3 years ago
8 0

Answer:

v = 15.23 m/s

Explanation:

Given that,

Mass of a car, m = 1110 kg

Initial velocity, u = 21 m/s

Force,F = -8000 N

Time, t = 0.9 s

We need to find the final velocity of the car.

Force, F = ma

F=\dfrac{m(v-u)}{t}\\\\v-u=\dfrac{Ft}{m}\\\\v=\dfrac{Ft}{m}+u\\\\v=\dfrac{-8000\times 0.8}{1110}+21\\\\v=15.23\ m/s

So, the final velocity of the car is 15.23 m/s.

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seropon [69]

Answer:

47.5kJ

Explanation:

Before climbing the cliff

E_t = E_k

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At 2.

E_t = E_k+E_p

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En un parque de atracciones hay una montaña rusa donde los primeros 140 metros son en línea recta, si desde que el carrito esta
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Answer:

Tiempo, t = 6.11 segundos.

Explanation:

Dados los siguientes datos;

Distancia = 140 m

Aceleración = 7,5 m/s²

Dado que el objeto partió del reposo, su velocidad inicial es igual a 0 m/s.

Para encontrar el tiempo, usaríamos la segunda ecuación de movimiento;

S = ut + ½at²

Dónde;

S representa el desplazamiento o la altura medida en metros.

u representa la velocidad inicial medida en metros por segundo.

t representa el tiempo medido en segundos.

a representa la aceleración medida en metros por segundo cuadrado.

Sustituyendo en la ecuación, tenemos;

140 = 0*t + ½*7.5*t²

140 = 0 + 3.75t²

140 = 3.75t²

Dividiendo ambos lados por 3,75, tenemos;

t² = 140/3.75

t = √37.33

Tiempo, t = 6.11 segundos

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Match each coordinate used on a globe of earth to its counterpart on the celestial sphere
nika2105 [10]
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Since force is dp/dt, the force due to radiation pressure reflected off of a solar sail can be calculated as 2 times the radiati
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Answer:

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I = Intensity of light

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p=\frac{E}{c}

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As given in question

F=2\frac{\frac{dE}{dt}}{c}

Now F/A = Pressure

P=\frac{2I}{c}\\\Rightarrow P=\frac{2\times 1300}{3\times 10^{8}}\\\Rightarrow P=8.67\times 10^{-6}\ N/m^2

∴ Magnitude of the pressure on the sail is 8.67×10⁻⁶ N/m²

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