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Westkost [7]
3 years ago
14

Light-rail passenger trains that provide transportation within and between cities speed up and slow down with a nearly constant

(and quite modest) acceleration. A train travels through a congested part of town at 4.0 m/s . Once free of this area, it speeds up to 11 m/s in 8.0 s. At the edge of town, the driver again accelerates, with the same acceleration, for another 16 s to reach a higher cruising speed. Part A What is the final speed
Physics
1 answer:
Nimfa-mama [501]3 years ago
3 0

Answer:

25 m/s

Explanation:

Given that:

Initial speed, u = 4 m/s

Final velocity, V = 11 m/s

Time, t = 8 seconds

t2, = 16 seconds

Acceleration, a= (change in velocity) / time interval

a = (11 - 4) / 8

a = 7 / 8 = 0.875m/s²

Final velocity, v2 ;

Acceleration * t2

0.875 * 16 = 14

V2 = 14 m/s

Final speed : v + v2 = (11 + 14)m/s = 25m/s

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A solid cylinder of mass 20kg rolls without slipping down a 30° slope. Find the acceleration and the frictional force needed to
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Answer:

a = 3.27 m/s²

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Explanation:

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Weight force mg pulling straight down.

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Friction force F pushing parallel up the slope.

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Since the cylinder rolls without slipping, a = αr.  Substituting:

F = ½ ma

Two equations, two unknowns (a and F).  Substituting the second equation into the first:

mg sin θ − ½ ma = ma

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a = ⅔ (9.8 m/s²) (sin 30°)

a = 3.27 m/s²

Solving for F:

F = ½ ma

F = ½ (20 kg) (3.27 m/s²)

F = 32.7 N

6 0
3 years ago
Compared to yellow light,orange light has
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Answer: The correct answer is- Field.

Explanation -

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A biker rides on an upward-sloped road inclined at a 15.0° angle with the horizontal. If he moves at a constant speed of 2.0 met
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