In an experiment, the control is

never changed by the scientist

not important to the scientist

not recorded by the scientist

changed by the scientist

Why is the halo of a galaxy the most important part of a galaxy?

in order for combustion to occur what needs to happen

A car travels 10 miles East in 30 minutes. What is its velocity in miles per hour? A) 20 miles per hour East B) 3 miles per minute East C) 0.333 miles per hour East D) + or - 20 miles per hour depending on direction

What are some strong sources of gravitational waves that astronomers hope to detect in the future?

The wheel of a car has a radius of 0.350 m. The engine of the car applies a torque of 295 N · m to this wheel, which does not slip against the road surface.

Along some shorelines, incoming waves cause the water to simply rise and fall rather that form a surf zone. What does this tell you about these shorlines?

Which word best describes the rate at which work is done? work energy power velocity

Explain why a valve would last longer in the pulmonary position than in the aortic position

Think about the process of heating water, the heating and upward motion of hot steam and air, and the spiral spinning. For these events, list each form of energy associated with the heat source, the water, the steam and air, and the spiral.

A long rope with mass m is suspended from the ceiling and hangs vertically. A wave pulse is produced at the lower end of the rope, and the pulse travels up the rope.