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jek_recluse [69]
3 years ago
5

A train's velocity is slowly decreasing as it approaches a station. About 1 km before it reaches the station, several stowaways

jump off the train. What happens to the amount of acceleration if the force remains constant? Assume the train is traveling in the positive direction.
Physics
1 answer:
Mars2501 [29]3 years ago
6 0

Answer:

Increases

Explanation:

From Newton's second law:

F = ma

If F stays the same and m decreases, then a increases.

Therefore, the magnitude of the train's acceleration increases (the acceleration becomes more negative).

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A car moving at a speed of 20 m/s has a kinetic energy of 200,000 J from that motion. What is the car's mass?
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Answer:

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8 0
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Si está probando u motor para un nuevo modelo de coche ; este es capaz de pasar de 0 a 100 km/h en 7,5 segundos . Si el coche ti
RideAnS [48]

Answer:

La fuerza que realiza el motor es 2035 N.

Explanation:

Podemos encontrar la fuerza del motor usando la siguiente ecuación:

F = ma   (1)

En donde:

m: es la masa del coche = 550 kg

a: es la aceleración

Se puede calcular la aceleración mediante la siguiente ecuación cinemática:

v_{f} = v_{0} + at   (2)

En donde:

v_{f}: es la velocidad final del coche = 100 km/h

v_{0}: es la velocidad inicial del coche = 0

t: es el tiempo = 7,5 s

Resolviendo la ecuación (2) para "a" tenemos:

a = \frac{v_{f} - v_{0}}{t} = \frac{100\frac{km}{h}*\frac{1000 m}{1 km}*\frac{1 h}{3600 s} - 0}{7,5 s} = 3,70 m/s^{2}

Entonces, la fuerza es:

F = ma = 550 kg*3,70 m/s^{2} = 2035 N

Por lo tanto, la fuerza que realiza el motor es 2035 N.

Espero que te sea de utilidad!

7 0
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Does cobalt gains or loses electrons in bonding
11111nata11111 [884]
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Explanation:

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