Choose the correct description of what do we mean when we say that light is an electromagnetic wave and the relationship among w
1 answer:
An electromagnetic wave is the oscillation of electric and magnetic fields that propagate in the space. Electromagnetic waves carry energy and they do not need a medium to propagate (they can travel in vacuum as well).
The correct relationship between the speed of the wave (speed of light, c), the frequency f and the wavelength
is
The correct relationship between the speed of the wave (speed of light, c), the frequency f and the wavelength
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Answer:
52,360,000km
Explanation:
To solve this problem you use a conversion factor.
By taking into account that 1UA = 1.496*10^{8}km you obtain:
hence, 0.35UA is about 52,360,000km. This is the least distance between Mars and Earth
Answer:
a.
b.
c.
d.
e.
Explanation:
<u>Work and Kinetic Energy </u>
When an object moves at a certain velocity v0 and changes it to v1, a change in its kinetic energy is achieved:
Knowing that
We have
The work done by the force who caused the change of velocity (acceleration) is
If we know the distance x traveled by the object, the work can also be calculated by
Being F the force responsible for the change of velocity
The 75 kg baseball player has an initial velocity of 6 m/s, then he slides and stops
a. Before the slide, his initial kinetic energy is
b. Once he reaches the base, the player is at rest, thus his final kinetic energy is
c. The change of kinetic energy is
d. The work done by friction to stop the player is
e. We compute the force of friction by using
and solving for x
The negative sign indicates the force is against movement