Need help with 1 A and 1 B
1 answer:
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A small 20-kg canoe is floating downriver at a speed of 2 m/s. 40 J is the canoe’s kinetic energy.
Answer: Option A
<u>Explanation:</u>
The given canoe has the mass and is being given to move at a speed. Therefore the kinetic energy of the canoe can be calculated using the following method,
Given that mass of the canoe = 20 kg and its speed =1 m/s
As we know that the Kinetic energy has the formula,
Therefore, substituting the value into the equation, we get,
= 40 J
Answer:
The frequency of this wave is .
Explanation:
The frequency of a wave is the number of wavelengths that this wave covers in unit time (typically a second.)
The wave in this question travels at . In other words, this wave covers
in unit time (a second.) How many wavelengths
would that
correspond to?
The question states that the wavelength of this wave is . Therefore, there would be
wavelengths in the
span that this wave covered in the unit time of one second (
.) Hence, the frequency of this wave would be
(three per second,) which is equivalent to
(three Hertzs.)
In general, the frequency of a wave with speed
and wavelength
would be:
.
For the wave in this question:
.