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tiny-mole [99]
3 years ago
12

One observer stand on a train moving at a constant speed, and one observer stands at rest on the ground. The person on the train

stands at the back of the car and turns on a flashight; the light travels to the front of the car, bounces off a mirror, and returns to the back of the car (assume the light is traveling in a vacuum). the observer on the train measures the time it takes for the light to take this path and knowing the length of the car, calculates the speed of light. What value does he obtain?
a) Greater than c

b) Equal to c

c) Less than c

d) The speed of the light canot be determined without knowing the speed of the train
Physics
1 answer:
ANTONII [103]3 years ago
3 0

Answer:

b) Equal to c

Explanation:

According to relativity, the speed of light in free space is constant in all inertial reference frame.

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How long must a tow truck apply a force of 600 N to increase the speed of a 1,500 kg car at rest to 2 m/s?
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The time the truck must apply the given force to increase its speed to given value is 5 s.

The given parameters;

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  • <em>mass of the truck, m = 1,500 kg</em>
  • <em>speed of the truck, v = 2 m/s</em>

The force applied to the truck is determined by Newton's second law of motion; <em>which states that the force applied to an object is directly proportional to the product of mass and acceleration of the object.</em>

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F = \frac{mv}{t} \\\\t = \frac{mv}{F} \\\\t = \frac{1500 \times 2}{600} \\\\t = 5 \ s

Thus, the time the truck must apply the given force to increase its speed to given value is 5 s.

Learn more here:brainly.com/question/1988795

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