I believe the answer would be Light rays are reflected by mirrors
<u>Answer:</u>
The correct answer option is C. buzzer.
<u>Explanation:</u>
We know that Jeff's father needs to get a device from his workshop that converts electrical energy to sound energy.
So from the given options, buzzer is the best option Jeff's father can install in his house's security system.
An electric buzzer converts an electrical oscillating voltage into a sound output. In other words, the electrical pulses are converted into sound vibrations.
Answer:
The matter has mass and takes up space. The amount of space that matter takes up is called its : density
Answer:
kinetic energy is 1/2mv^2.
which is 1/2×0.05×3^2
1/2×0.05×9.
1/2×0.45=
0.45÷2=0.225~0.23J
