A motorboat is tied to a dock with its motor running. The spinning propeller makes a surface wave that moves at a speed of 400 cm/s with a wavelength of 100 cm. What is the wave’s frequency? 4 Hz

40 Hz

0.25 Hz

25 Hz

The wave frequency is 0.25Hz .

4 Hz

Explanation:

1. Speed = Wavelength x Wave Frequency can be changed to Frequency = Speed/Wavelength.

2. Speed (400) / Wavelength (100) = Frequency of 4 cm/s or 4 Hz.

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table