Whenever he takes a picture, he always gazes directly at the camera.

I fine-tuned the television to make the picture clear.

He tuned in the sound of the guitar.

When an object is in free fall, its terminal velocity is determined by the balance between gravity and air resistance.

What is the initial velocity of this object?

He looked at the speedometer and checked the speed of the car.

Do you understand the necessity of this project?

That information is unnecessary.

That information is completely unnecessary.

He thinks that war is a necessary evil.