A wave has a velocity of 24 m/s and a period of 3 s.
2 answers:
Answer:
cannot be determined from the given information
Explanation:
The amplitude of a wave corresponds to the maximum displacement of the wave with respect to its equilibrium position. However, the amplitude of a wave has no relationship neither with its velocity, nor with its period.
On the contrary, velocity and period are related by the following equation:
where v is the velocity, the wavelength, and T the period of the wave.
Therefore, from the given information we have no way to determine the amplitude of the wave, so the correct answer is
cannot be determined from the given information
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Answer:
C) 19 m/s
Explanation:
The motion of the cannonball is a projectile motion, which consists of 2 independent motions:
- A uniform motion (constant velocity) along the horizontal direction
- A uniformly accelerated motion (constant acceleration) along the vertical direction
As a result, we have the following:
- The horizontal velocity of the cannonball remains constant during the motion, and it is given by
where
u = 25 m/s is the initial velocity
is the angle
Substituting,
- The vertical velocity keeps changing during the motion due to the acceleration of gravity. However, at the top of the trajectory, the vertical velocity is zero:
This means that at the top of its path, the cannonball has only horizontal velocity, so its velocity is
C) 19 m/s