You shine a light in a dark tunnel towards your friend the distance between the two of you are 25m how long does it take for the light to cover this distance
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Ответ:
0.000000083333 seconds = 83.333 nanoseconds
Explanation:
The speed of light is approximately 300.000.000 m/s, that means in one second, the light travels 300.000.000 meters.
We can solve that problem using rule of three:
If the light travels 300.000.000 meters in 1 second, to travel 25 meters how long it will take? (let's call the time we want by "T")
300.000.000 - 1
25 - T
300.000.000/25 = 1/T
T = 25/300.000.000
T = 0.000000083333 seconds = 83.333 nanoseconds
Ответ:
B. The potential energy decreases while the kinetic energy increases.
Explanation:
Potential Energy (PE) = mgh
where m -mass of object
g- acceleration due to gravity,
But mg is constant, hence the only variable that is changing is the height, and it is directly proportional to the potential energy. This means at the maximum height we have the greatest potential energy. This means that at its highest point, the pendulum possesses maximum potential energy hence as it moves to the lowest point potential energy decreases.
Kinetic energy is given by
Where m is is the mass of the object and v its velocity.
The equation shows that Kinetic energy is directly proportional to the square of velocity. This means kinetic energy is greatest when we have maximum velocity. At its lowest point the pendulum moves with maximum velocity therefore from the highest point to the lowest point velocity is increasing which means kinetic energy is also increasing.